阅读说明：本技术 线宽标准样片的线宽量值确定的方法及系统 (Method and system for determining line width value of line width standard sample ) 是由 韩志国 李锁印 梁法国 冯亚南 张晓东 赵琳 许晓青 吴爱华 于 2020-04-24 设计创作，主要内容包括：本发明适用于微纳米测量仪器计量技术领域,提供了一种线宽标准样片的线宽量值确定的方法及系统,该方法包括：对椭偏仪进行校准；建立基于多层膜沉积工艺的多层膜厚样片测量模型,并在所述多层膜厚样片测量模型建立过程中对初次校准后的椭偏仪进行再次校准；基于多层膜沉积工艺沉积多层膜厚样片；采用再次校准后的椭偏仪,对所述多层膜厚样片的薄膜厚度进行测量,得到测量结果,并将所述测量结果作为线宽标准样片的线宽量值,从而可以确定纳米级线宽标准样片的量值,提高纳米级线宽标准样片定值的准确度。(The invention is suitable for the technical field of measurement of micro-nano measuring instruments, and provides a method and a system for determining the line width value of a line width standard sample wafer, wherein the method comprises the following steps: calibrating the ellipsometer; establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process, and performing recalibration on the ellipsometer after primary calibration in the multilayer film thickness sample measurement model establishing process; depositing a multilayer film thickness sample wafer based on a multilayer film deposition process; and measuring the film thickness of the multilayer film thickness sample by adopting the ellipsometer after recalibration to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample, so that the value of the nanoscale line width standard sample can be determined, and the accuracy of the nanoscale line width standard sample value is improved.)

1. A method for determining a line width value of a line width standard sample is characterized by comprising the following steps:

calibrating the ellipsometer;

establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process, and performing recalibration on the ellipsometer after primary calibration in the multilayer film thickness sample measurement model establishing process;

depositing a multilayer film thickness sample wafer based on a multilayer film deposition process;

and measuring the film thickness of the multilayer film thickness sample by adopting the ellipsometer after recalibration to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample.

2. The method for linewidth magnitude determination of a linewidth reticle of claim 1, wherein the calibrating the ellipsometer comprises:

and (3) calibrating the ellipsometer by adopting a plurality of silicon dioxide film thickness standard sample wafers with different film thicknesses.

3. The method for determining the linewidth value of the linewidth standard coupon of claim 1, wherein the establishing of the multilayer film thickness coupon measurement model based on the multilayer film deposition process comprises:

growing a layer of first dielectric material on a first accompanying wafer by adopting a wafer and the first accompanying wafer;

measuring a media parameter of the first media material;

growing a layer of second dielectric material on the second wafer by adopting the wafer and the second wafer;

measuring a media parameter of the second media material;

and establishing a multilayer film thickness sample wafer measurement model based on a multilayer film deposition process according to the medium parameters of the first medium material and the second medium material.

4. The method for determining the linewidth magnitude of a linewidth master of claim 3, wherein the growing a layer of a first dielectric material on a first wafer using a wafer and the first wafer comprises:

growing a layer of first medium material on a first accompanying wafer by adopting a magnetron sputtering process based on a wafer and the first accompanying wafer;

adopting wafer and second accompany piece in the growth one deck second dielectric material of second accompany piece includes:

and growing a layer of second medium material on the second wafer by adopting a magnetron sputtering process based on the wafer and the second wafer.

5. The method for determining a linewidth magnitude of a linewidth reticle of claim 3, wherein said measuring a dielectric parameter of said first dielectric material comprises:

setting initial measurement parameters for the ellipsometer after primary calibration according to the materials of the wafer and the first accompanying sheet;

measuring a medium parameter of the first medium material based on the ellipsometer after primary calibration;

and when the medium parameter is not in the range of the preset standard medium parameter, calibrating the ellipsometer after the primary calibration again, measuring the medium parameter of the first medium material by adopting the ellipsometer after the secondary calibration until the measured medium parameter is in the range of the preset standard medium parameter, and determining that the finally measured medium parameter is the medium parameter of the first medium material.

6. The method for determining a linewidth magnitude of a linewidth reticle of claim 5, wherein said measuring a dielectric parameter of said first dielectric material comprises:

and when the multilayer film thickness sample measurement model is established, measuring the medium parameters of the first medium material by adopting the multilayer film thickness sample measurement model.

7. The method for determining the linewidth value of the linewidth standard wafer of claim 3, wherein the measuring the film thickness of the multilayer film thickness sample using the recalibrated ellipsometer to obtain the measurement result comprises:

and measuring the film thickness of the second dielectric material in the multilayer film thickness sample by using the ellipsometer after recalibration to obtain a measurement result.

8. The method for determining the linewidth value of the linewidth standard wafer of claim 7, wherein the step of measuring the film thickness of the second dielectric material in the multilayer film thickness sample by using the recalibrated ellipsometer to obtain the measurement result comprises:

determining a plurality of measuring positions on the surface of a second dielectric material in the multilayer film thickness sample wafer;

sequentially measuring the film thickness of the plurality of measurement positions by using the ellipsometer after recalibration to obtain a plurality of measurement results;

and calculating an average value of the plurality of measurement results, and taking the average value as the film thickness of the second dielectric material.

9. The method for determining the linewidth magnitude of a linewidth standard wafer of claim 1, wherein after the measuring the film thickness of the multilayer film thickness wafer using the recalibrated ellipsometer to obtain the measurement result, further comprising:

and calculating the uncertainty of the line width value according to the ellipsometer after recalibration and the measurement result.

10. A system for determining a line width value of a line width master, comprising: the ellipsometer comprises an ellipsometer and processing equipment, wherein the processing equipment comprises a calibration module and a measurement model establishing module;

the calibration module is used for calibrating the ellipsometer;

the measurement model establishing module is used for establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process;

the calibration module is further used for re-calibrating the ellipsometer after primary calibration in the process of establishing the multilayer film thickness sample measurement model;

the measurement model establishing module is also used for depositing a multilayer film thickness sample wafer based on a multilayer film deposition process;

and the ellipsometer after recalibration is used for measuring the film thickness of the multilayer film thickness sample wafer to obtain a measurement result, and the measurement result is used as the line width value of the line width standard sample wafer.

Technical Field

The invention belongs to the technical field of measurement of micro-nano measuring instruments, and particularly relates to a method and a system for determining a line width value of a line width standard sample wafer.

Background

The line width standard sample is used as a calibration standard instrument of a micro-nano measuring instrument and is widely applied to the fields of semiconductors and microelectronics, such as scanning electron microscopes, transmission electron microscopes and the like. The accuracy of the line width standard sample magnitude directly affects the reliability of the measurement instrument calibration result.

The line width standard sample is generally rated by using an electron microscope method and an atomic force microscope method. At present, after a multilayer film deposition technology is adopted to prepare and form a line width standard sample wafer, an atomic force microscope or an electron microscope can only be used for measuring and fixing the line width, however, when the line width reaches the nanometer level, the uncertainty of the measurement of the line width value given by the electron microscope method is large, and is usually about 3 nm; atomic force microscopy, however, cannot measure due to the presence of probe effects.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and a system for determining a line width value of a line width standard sample, which aim to solve the problem in the prior art that the line width value of a nanometer-scale line width standard sample cannot be accurately measured.

In order to achieve the above object, a first aspect of the embodiments of the present invention provides a method for determining a line width value of a line width standard sample, including:

calibrating the ellipsometer;

establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process, and performing recalibration on the ellipsometer after primary calibration in the multilayer film thickness sample measurement model establishing process;

depositing a multilayer film thickness sample wafer based on a multilayer film deposition process;

and measuring the film thickness of the multilayer film thickness sample by adopting the ellipsometer after recalibration to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample.

As another embodiment of the present application, the calibrating the ellipsometer includes:

and (3) calibrating the ellipsometer by adopting a plurality of silicon dioxide film thickness standard sample wafers with different film thicknesses.

As another embodiment of the present application, the establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process includes:

growing a layer of first dielectric material on a first accompanying wafer by adopting a wafer and the first accompanying wafer;

measuring a media parameter of the first media material;

growing a layer of second dielectric material on the second wafer by adopting the wafer and the second wafer;

measuring a media parameter of the second media material;

and establishing a multilayer film thickness sample wafer measurement model based on a multilayer film deposition process according to the medium parameters of the first medium material and the second medium material.

As another embodiment of the present application, the growing a layer of a first dielectric material on a first accompanying wafer by using a wafer and the first accompanying wafer includes:

growing a layer of first medium material on a first accompanying wafer by adopting a magnetron sputtering process based on a wafer and the first accompanying wafer;

adopting the wafer and a second accompanying sheet to grow a layer of second dielectric material on the second accompanying sheet, wherein the second dielectric material comprises:

and growing a layer of second medium material on the second wafer by adopting a magnetron sputtering process based on the wafer and the second wafer.

As another embodiment of the present application, measuring a media parameter of the first media material comprises:

setting initial measurement parameters for the ellipsometer after primary calibration according to the materials of the wafer and the first accompanying sheet;

measuring a medium parameter of the first medium material based on the ellipsometer after primary calibration;

and when the medium parameter is not in the range of the preset standard medium parameter, calibrating the ellipsometer after the primary calibration again, measuring the medium parameter of the first medium material by adopting the ellipsometer after the secondary calibration until the measured medium parameter is in the range of the preset standard medium parameter, and determining that the finally measured medium parameter is the medium parameter of the first medium material.

As another embodiment of the present application, the measuring the dielectric parameter of the first dielectric material includes:

and when the multilayer film thickness sample measurement model is established, measuring the medium parameters of the first medium material by adopting the multilayer film thickness sample measurement model.

As another embodiment of the present application, the measuring the film thickness of the multi-layer film thickness sample by using the ellipsometer after recalibration to obtain a measurement result includes:

and measuring the film thickness of the second dielectric material in the multilayer film thickness sample by using the ellipsometer after recalibration to obtain a measurement result.

As another embodiment of the present application, the measuring the film thickness of the second dielectric material in the multilayer film thickness sample by using the ellipsometer after recalibration to obtain a measurement result includes:

determining a plurality of measuring positions on the surface of a second dielectric material in the multilayer film thickness sample wafer;

sequentially measuring the film thickness of the plurality of measurement positions by using the ellipsometer after recalibration to obtain a plurality of measurement results;

and calculating an average value of the plurality of measurement results, and taking the average value as the film thickness of the second dielectric material.

As another embodiment of the present application, after the re-calibrated ellipsometer is used to measure the film thickness of the multilayer film thickness sample and obtain the measurement result, the method further includes:

and calculating the uncertainty of the line width value according to the ellipsometer after recalibration and the measurement result.

A second aspect of the embodiments of the present invention provides a system for determining a line width value of a line width standard sample, including: the ellipsometer comprises an ellipsometer and processing equipment, wherein the processing equipment comprises a calibration module and a measurement model establishing module;

the calibration module is used for calibrating the ellipsometer;

the measurement model establishing module is used for establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process;

the calibration module is further used for re-calibrating the ellipsometer after primary calibration in the process of establishing the multilayer film thickness sample measurement model;

the measurement model establishing module is also used for depositing a multilayer film thickness sample wafer based on a multilayer film deposition process;

and the ellipsometer after recalibration is used for measuring the film thickness of the multilayer film thickness sample wafer to obtain a measurement result, and the measurement result is used as the line width value of the line width standard sample wafer.

Compared with the prior art, the embodiment of the invention has the following beneficial effects: compared with the prior art, the ellipsometer is calibrated; establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process, and performing recalibration on the ellipsometer after primary calibration in the multilayer film thickness sample measurement model establishing process; depositing a multilayer film thickness sample wafer based on a multilayer film deposition process; and measuring the film thickness of the multilayer film thickness sample by adopting the ellipsometer after recalibration to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample, so that the value of the nanoscale line width standard sample can be determined, and the accuracy of the nanoscale line width standard sample value is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic view of an implementation flow of a method for determining a line width value of a line width standard sample according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a method for modeling a multi-layer film thickness sample according to an embodiment of the present invention;

FIG. 3(1) is a schematic structural diagram of a first multi-layer film thickness sample according to an embodiment of the present invention;

FIG. 3(2) is a schematic diagram of a first multilayer film thickness sample wafer cut according to an embodiment of the present invention;

FIG. 3(3) is a schematic diagram of a second multilayer film thickness sample wafer polished and polished according to an embodiment of the present invention;

FIG. 3(4) is a schematic diagram of a multi-layer film thickness sample wafer according to an embodiment of the present invention;

FIG. 4 is an exemplary illustration of a measurement location of a surface of a second dielectric material provided by an embodiment of the invention;

FIG. 5 is an exemplary diagram of a system for determining a linewidth magnitude of a linewidth reticle provided by an embodiment of the present invention;

fig. 6 is a diagram illustrating a system for determining a linewidth value of a linewidth reticle according to another embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

Fig. 1 is a schematic view of an implementation flow of a method for determining a line width value of a line width standard sample according to an embodiment of the present invention, which is described in detail below.

Step 101, calibrating an ellipsometer.

Alternatively, the ellipsometer may be a spectroscopic ellipsometer, and a plurality of silica film thickness standard samples with different film thicknesses may be used to calibrate the ellipsometer. For example, a spectroscopic ellipsometer is calibrated by using a series of silica film thickness standards with a film thickness of 2nm to 1000nm, and hardware parameters of the ellipsometer, which may include an incident angle, a light source wavelength, an elliptical polarization angle, etc., are corrected. The correction of hardware parameters of the ellipsometer can ensure that the instrument value is accurate and reliable. Alternatively, the spectroscopic ellipsometer may be calibrated using three or more silica film thickness standards with a film thickness of 2nm, 10nm, 100nm, 200nm, 500nm, 1000nm, or the like.

Optionally, the measurement accuracy of the ellipsometer is based on the accuracy of the hardware of the ellipsometer and the accuracy of the measurement model, so after the ellipsometer is calibrated, an accurate measurement model, such as a multilayer film thickness measurement model, needs to be established.

Step 102, establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process, and performing recalibration on the ellipsometer after primary calibration in the multilayer film thickness sample measurement model establishing process.

Optionally, in this step, a multilayer film thickness sample measurement model based on a multilayer film deposition process may be established by using a coscopy method based on the ellipsometer after primary calibration. As shown in fig. 2, establishing a multilayer film thickness coupon measurement model based on a multilayer film deposition process may include the following steps.

Step 201, growing a layer of first dielectric material on a first accompanying wafer by using a wafer and the first accompanying wafer.

Three silicon wafers are required to be prepared, namely a wafer, a first accompanying wafer and a second accompanying wafer. In the step, a layer of first dielectric material is grown on a first accompanying wafer by adopting a magnetron sputtering process based on the wafer and the first accompanying wafer.

Magnetron sputtering is one type of Physical Vapor Deposition (PVD). The magnetron sputtering method is to ionize inert gas under vacuum condition, and the gas ions bombard the metal target under the action of an electric field to deposit metal atoms on the cosheet.

Step 202, measuring a medium parameter of the first medium material.

Optionally, this step may include: setting initial measurement parameters for the ellipsometer after primary calibration according to the materials of the wafer and the first accompanying sheet; measuring a medium parameter of the first medium material based on the ellipsometer after primary calibration; and when the medium parameter is not in the range of the preset standard medium parameter, calibrating the ellipsometer after the primary calibration again, measuring the medium parameter of the first medium material by adopting the ellipsometer after the secondary calibration until the measured medium parameter is in the range of the preset standard medium parameter, and determining that the finally measured medium parameter is the medium parameter of the first medium material. Namely, the ellipsometer is calibrated for many times, so that the accuracy of measuring the film thickness of the multilayer film thickness sample can be improved.

Optionally, the initial measurement parameter may be a reflection parameter of the material of the wafer and the first sub-wafer to the light.

Optionally, the media parameters may include thickness and dispersion parameters. After the medium parameters of the first medium material are obtained through measurement, the thickness and dispersion parameters can be stored so as to be used in the subsequent establishment of a multilayer film thickness sample measurement model.

And 203, growing a layer of second dielectric material on the second accompanying sheet by using the wafer and the second accompanying sheet.

Optionally, a layer of second dielectric material is grown on the second wafer by a magnetron sputtering process based on the wafer and the second wafer.

Step 204, measuring the medium parameter of the second medium material.

Optionally, this step may use the same technique as that of step 202 to perform measurement, and is not described in detail here.

Step 205, establishing a multilayer film thickness sample wafer measurement model based on a multilayer film deposition process according to the medium parameters of the first medium material and the second medium material.

Optionally, after the multilayer film thickness sample measurement model is established, a multilayer film thickness sample measurement model of another material needs to be established, and the added multilayer film thickness sample measurement model may be used to directly measure the medium parameter of the medium material, for example, when the multilayer film thickness sample measurement model is established, the multilayer film thickness sample measurement model is used to measure the medium parameter of the first medium material. Therefore, the medium parameter of the medium material can be accurately determined, and the measurement efficiency of the medium parameter can be improved.

And 103, depositing a multilayer film thickness sample wafer based on a multilayer film deposition process.

Optionally, as shown in fig. 3(1), a silicon wafer 1 and a silicon wafer 2 are adopted, a layer of dielectric material 1 is grown on the silicon wafer 1 and the silicon wafer 2 respectively by using a magnetron sputtering process, then a layer of dielectric material 2 is grown on the silicon wafer 1 on which the dielectric material 1 has grown, and the silicon wafer 1 on which the dielectric material 1 has grown and the silicon wafer 2 on which the dielectric material 1 has grown are bonded together by using a bonding mode, so as to obtain a first multilayer film thickness sample, wherein the dielectric material 2 of the silicon wafer 1 is bonded together with the dielectric material 1 of the silicon wafer 2. As shown in fig. 3(2), the first multilayer film thickness sample is cut by dicing. As shown in fig. 3(3), the cut surface of any one of the second multilayer film thickness samples after cutting was polished and polished. As shown in fig. 3(4), the dielectric material 1 in the polished multilayer film thickness sample is etched to obtain a multilayer film thickness sample.

And 104, measuring the film thickness of the multilayer film thickness sample by using the re-calibrated ellipsometer to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample.

Optionally, after a multilayer film deposition technology is adopted to prepare a line width standard sample wafer in the prior art, an atomic force microscope or an electron microscope can only be used for line width measurement and setting, and when the line width value reaches a nanometer level, the setting accuracy is poor; according to the invention, the grown thin film is converted into the line width through a multilayer film deposition technology, namely, in the process of processing a wide sample wafer on line, the thickness value of the thin film is determined through measurement of an ellipsometer which is calibrated for many times, the thickness value is converted into the line width value of the wide sample wafer, the influence of the uniformity of the thin film is considered, and the line width value is comprehensively evaluated, so that the thickness of the thin film can be accurately measured, and the accuracy of the fixed value is higher.

Optionally, in consideration of the influence of the film uniformity, the influence of the film uniformity can be reduced by calculating an average value of the film thickness at different positions.

Optionally, this step may include: determining a plurality of measuring positions on the surface of a second dielectric material in the multilayer film thickness sample wafer; sequentially measuring the film thickness of the plurality of measurement positions by using the ellipsometer after recalibration to obtain a plurality of measurement results; and calculating an average value of the plurality of measurement results, and taking the average value as the film thickness of the second dielectric material.

For example, as shown in fig. 4, 5 measurement positions may be selected on the surface of the second dielectric material, and it should be noted that the selection of the measurement positions may be uniformly distributed on the surface of the second dielectric material, so that the calculated average value of the film thickness can represent the uniformity of the film.

Alternatively, it should be noted that the film thickness of the first dielectric material may also be measured, and the average value of the film thicknesses of the multiple measurement positions of the first dielectric material may be used as the film thickness of the second dielectric material.

Optionally, after the ellipsometer calibrated again is used to measure the film thickness of the multilayer film thickness sample and obtain a measurement result, the method further includes: and calculating the uncertainty of the line width value according to the ellipsometer after recalibration and the measurement result.

The uncertainty component mainly comprises an ellipsometer and sample thickness uniformity, wherein the uncertainty determination method of the ellipsometer can be evaluated by adopting a Monte Carlo evaluation method, and the sample thickness uniformity is obtained by calculating the measured film thicknesses at different positions by adopting a polarization method. For example, according to s ═ x_max-x_min)/d_nCalculating to obtain the uncertainty of the thickness uniformity of the sample wafer; wherein s represents the uncertainty of the sample thickness uniformity, x_maxDenotes the maximum thickness, x, in the film thickness at different locations_minDenotes the minimum thickness of the film at different locations, d_nRepresenting the pole difference coefficient.

The method for determining the line width value of the line width standard sample wafer comprises the steps of calibrating an ellipsometer; establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process, and performing recalibration on the ellipsometer after primary calibration in the multilayer film thickness sample measurement model establishing process; depositing a multilayer film thickness sample wafer based on a multilayer film deposition process; and measuring the film thickness of the multilayer film thickness sample by adopting the ellipsometer after recalibration to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample, so that the value of the nanoscale line width standard sample can be determined, and the accuracy of the nanoscale line width standard sample value is improved.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Corresponding to the method for determining the line width value of the line width standard sample in the foregoing embodiment, fig. 5 illustrates an exemplary diagram of a system for determining the line width value of the line width standard sample according to an embodiment of the present invention. As shown in fig. 5, the apparatus may include: the ellipsometer comprises an ellipsometer 1 and a processing device 2, wherein the processing device 2 comprises a calibration module 501 and a measurement model establishing module 502;

the calibration module 501 is configured to calibrate the ellipsometer;

the measurement model establishing module 502 is used for establishing a multilayer film thickness sample measurement model based on a multilayer film deposition process;

the calibration module 501 is further configured to calibrate the ellipsometer after the initial calibration again in the process of establishing the multilayer film thickness sample measurement model;

the measurement model establishing module 502 is further configured to deposit a multilayer film thickness sample wafer based on a multilayer film deposition process;

and the ellipsometer 1 after recalibration is used for measuring the film thickness of the multilayer film thickness sample wafer to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample wafer.

Optionally, when the calibration module 501 calibrates the ellipsometer, it may be configured to: and (3) calibrating the ellipsometer by adopting a plurality of silicon dioxide film thickness standard sample wafers with different film thicknesses.

Optionally, when the measurement model establishing module 502 establishes the multilayer film thickness sample measurement model based on the multilayer film deposition process, it may be configured to:

growing a layer of first dielectric material on a first accompanying wafer by adopting a wafer and the first accompanying wafer;

measuring a media parameter of the first media material;

growing a layer of second dielectric material on the second wafer by adopting the wafer and the second wafer;

measuring a media parameter of the second media material;

and establishing a multilayer film thickness sample wafer measurement model based on a multilayer film deposition process according to the medium parameters of the first medium material and the second medium material.

Optionally, when the measurement model establishing module 502 adopts a wafer and a first accompanying wafer to grow a layer of a first dielectric material on the first accompanying wafer, the measurement model establishing module may be configured to: and growing a layer of first medium material on the first accompanying wafer by adopting a magnetron sputtering process based on the wafer and the first accompanying wafer.

Optionally, when the measurement model establishing module 502 uses the wafer and the second sub-wafer to grow a layer of the second dielectric material on the second sub-wafer, the measurement model establishing module may be configured to: and growing a layer of second medium material on the second wafer by adopting a magnetron sputtering process based on the wafer and the second wafer.

Optionally, the measurement model establishing module 502 measures a medium parameter of the first medium material, including:

setting initial measurement parameters for the ellipsometer after primary calibration according to the materials of the wafer and the first accompanying sheet;

measuring a medium parameter of the first medium material based on the ellipsometer after primary calibration;

and when the medium parameter is not in the range of the preset standard medium parameter, calibrating the ellipsometer after the primary calibration again, measuring the medium parameter of the first medium material by adopting the ellipsometer after the secondary calibration until the measured medium parameter is in the range of the preset standard medium parameter, and determining that the finally measured medium parameter is the medium parameter of the first medium material.

Optionally, when the measurement model establishing module 502 measures the medium parameter of the first medium material, it may be configured to:

and when the multilayer film thickness sample measurement model is established, measuring the medium parameters of the first medium material by adopting the multilayer film thickness sample measurement model.

Optionally, the ellipsometer 1 after recalibration is configured to measure the film thickness of the second dielectric material in the multilayer film thickness sample, so as to obtain a measurement result.

Optionally, the ellipsometer 1 after recalibration is used for determining a plurality of measurement positions on the surface of the second dielectric material in the multilayer film thickness sample;

sequentially measuring the film thickness of the plurality of measurement positions by using the ellipsometer after recalibration to obtain a plurality of measurement results;

and calculating an average value of the plurality of measurement results, and taking the average value as the film thickness of the second dielectric material.

Optionally, as shown in fig. 6, after the recalibrated ellipsometer measures the film thickness of the multilayer film thickness sample and obtains the measurement result, the processing apparatus may further include: a calculation module 503;

the calculating module 503 is configured to calculate an uncertainty of the line width value according to the recalibrated ellipsometer and the measurement result.

The system for determining the line width value of the line width standard sample calibrates the ellipsometer through the calibration module 501; the measurement model establishing module 502 establishes a multilayer film thickness sample measurement model based on a multilayer film deposition process, and the calibration module 501 recalibrates the initially calibrated ellipsometer in the multilayer film thickness sample measurement model establishing process; the measurement model establishing module 502 deposits a multilayer film thickness sample wafer based on a multilayer film deposition process; and measuring the film thickness of the multilayer film thickness sample by adopting the ellipsometer after recalibration to obtain a measurement result, and taking the measurement result as the line width value of the line width standard sample, so that the value of the nanoscale line width standard sample can be determined, and the accuracy of the nanoscale line width standard sample value is improved.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.