阅读说明：本技术 研磨垫修整装置 (Polishing pad dressing device ) 是由 丁彦荣 杨涛 张月 卢一泓 刘青 于 2020-05-15 设计创作，主要内容包括：本发明提供一种研磨垫修整装置,包括：调节臂；以及两个或两个以上修整盘,与所述调节臂连接；所述两个或两个以上修整盘分别用于对所述研磨垫不同区域的表面进行修整。本发明的研磨垫修整装置采用多个修整盘对研磨垫的表面进行修整,能够对整个研磨垫的表面进行持续修整,提高工艺的再现性和散布性,并且能够延长研磨垫的使用周期。(The invention provides a polishing pad dressing device, comprising: an adjusting arm; and two or more finishing disks connected with the adjusting arm; the two or more trimming disks are respectively used for trimming the surfaces of different areas of the grinding pad. The polishing pad dressing device of the invention uses a plurality of dressing disks to dress the surface of the polishing pad, can continuously dress the surface of the whole polishing pad, improves the reproducibility and the dispersion of the process, and can prolong the service cycle of the polishing pad.)

1. A polishing pad dressing apparatus, comprising:

an adjusting arm; and

two or more trimming disks connected with the adjusting arm; the two or more trimming disks are respectively used for trimming the surfaces of different areas of the grinding pad.

2. The polishing pad conditioning apparatus of claim 1, wherein the two or more conditioning disks are linearly arranged on the conditioning arm.

3. The polishing pad dressing apparatus according to claim 1, wherein the length of an area covered by the two or more dressing disks in the extending direction of the conditioning arm is equal to or smaller than the radius of the polishing pad.

4. The polishing pad conditioning apparatus of claim 1, further comprising a rotational drive mechanism drivingly connected to the two or more conditioning disks to drive the conditioning disks in rotation.

5. The polishing pad conditioning apparatus according to claim 1, further comprising two or more rotational driving mechanisms, wherein the two or more conditioning disks are in one-to-one transmission connection with the two or more rotational driving mechanisms, and each rotational driving mechanism is used for driving the corresponding conditioning disk to rotate.

6. The polishing pad dressing apparatus according to claim 4 or 5, wherein said rotary drive mechanism is a motor, and said dressing disk is in belt or gear transmission connection with said motor.

7. The polishing pad conditioning apparatus according to claim 1, further comprising two or more gas pressurization mechanisms, the two or more conditioning disks being connected to the two or more gas pressurization mechanisms, each gas pressurization mechanism being configured to pressurize each conditioning disk.

8. The polishing pad conditioner of claim 7 wherein said gas pressurization mechanism is a pneumatic diaphragm.

9. The polishing pad conditioner of claim 8, further comprising a media conduit disposed on said conditioning arm, said pneumatic diaphragm supplying gas through said media conduit.

10. The polishing pad conditioning apparatus of claim 1, further comprising a swing drive mechanism, the conditioning arm being coupled to the swing drive mechanism, the swing drive mechanism being configured to drive the conditioning arm in a swinging motion within a predetermined angle.

Technical Field

The invention relates to the technical field of chemical mechanical polishing, in particular to a polishing pad dressing device.

Background

In the process of polishing semiconductor devices, the polishing pad gradually becomes smooth after polishing a certain number of semiconductor devices, and if the polishing is continued in this state, the process characteristics of the semiconductor devices are affected. In order to make the polishing pad have a state similar to the initial state, it is necessary to restore the polishing pad surface with a conditioning disk so that the polishing pad surface is again in a rough state. The process of repairing the surface of the polishing pad is called a dressing process of the polishing pad.

Disclosure of Invention

The polishing pad dressing device provided by the invention can continuously dress the polishing pad and ensure the reproducibility and the dispersion of the process.

The invention provides a polishing pad dressing device, comprising:

an adjusting arm; and

two or more trimming disks connected with the adjusting arm; the two or more trimming disks are respectively used for trimming the surfaces of different areas of the grinding pad.

Optionally, the two or more conditioning disks are arranged linearly on the adjustment arm.

Optionally, the two or more conditioning disks cover an area along the extension direction of the conditioning arm with a length equal to or less than the radius of the polishing pad.

Optionally, the dressing disk drive further comprises a rotary driving mechanism, wherein the rotary driving mechanism is in transmission connection with the two or more dressing disks so as to drive the dressing disks to rotate.

Optionally, the trimming device further comprises two or more rotary driving mechanisms, the two or more trimming disks are in one-to-one corresponding transmission connection with the two or more rotary driving mechanisms, and each rotary driving mechanism is used for driving a corresponding trimming disk to rotate.

Optionally, the rotary driving mechanism is a motor, and the trimming disk is in transmission connection with the motor through a belt or a gear.

Optionally, the apparatus further comprises two or more gas pressurizing mechanisms, the two or more trimming disks are connected with the two or more gas pressurizing mechanisms, and each gas pressurizing mechanism is used for pressurizing each trimming disk.

Optionally, the gas pressurizing mechanism is a pneumatic diaphragm.

Optionally, further comprising a media conduit disposed on the adjustment arm, the pneumatic diaphragm being supplied with gas through the media conduit.

Optionally, the adjusting device further comprises a swing driving mechanism, wherein the adjusting arm is connected with the swing driving mechanism, and the swing driving mechanism is used for driving the adjusting arm to swing within a preset angle.

The polishing pad dressing device of the invention adopts a plurality of dressing disks to dress the surface of the polishing pad, the plurality of dressing disks can cover a larger range, and under the optimal condition, the plurality of dressing disks can cover the range of the radius of the polishing pad, thereby continuously dressing the surface of the whole polishing pad, improving the reproducibility and the dispersivity of the process and prolonging the service life of the polishing pad. Meanwhile, each dressing disk trims the surface performance of the corresponding area of the grinding pad, different dressing disks can adjust different rotating speeds or pressing pressures according to the surface characteristics of the corresponding area of the grinding pad, different dressing processes can be adopted for different areas, and therefore the uniformity of the wafer can be improved.

Drawings

FIG. 1 is a schematic top view of a polishing pad conditioner according to one embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a polishing pad dressing apparatus according to an embodiment of the invention.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.

Various structural schematics according to embodiments of the present disclosure are shown in the figures. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.

In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present. In addition, if a layer/element is "on" another layer/element in one orientation, then that layer/element may be "under" the other layer/element when the orientation is reversed.

An embodiment of the invention provides a polishing pad dressing apparatus, as shown in fig. 1, including: the adjusting arm 1 is arranged above the grinding pad 3; two or more finishing disks 2 connected with the adjusting arm 1; two or more dressing disks are used to dress the surface of the polishing pad 3 in different areas, respectively.

In the working process, the polishing head 4 is used for fixing a wafer and driving the wafer to polish on the polishing pad 3, when the polishing pad 3 needs to be repaired, the two or more than two dressing disks 2 are used for dressing the polishing pad 3, and then the cleaning device 5 is used for cleaning the polishing slag, so that the surface performance of the polishing pad 3 is recovered to the initial state. Due to the fact that the plurality of trimming disks are adopted, different trimming parameters can be set for different trimming disks according to trimming requirements of different areas. Thus, the present embodiment is not only able to cover a larger dressing area with a plurality of dressing disks, but is also able to set different dressing parameters for different dressing areas.

As an alternative to this embodiment, two or more of the conditioning disks 2 are arranged linearly, which makes it possible to identify the conditioning area associated with each conditioning disk 2 most easily and intuitively, and to reduce as much as possible the overlap of the conditioning areas between two adjacent conditioning disks caused during the oscillating movement of the adjusting arm. As another alternative of the present embodiment, the above-described two or more conditioning disks 2 may be arranged in a staggered manner, which can reduce the gap between the conditioning regions due to the gap between two adjacent conditioning disks 2.

As an alternative embodiment of the present embodiment, the distance covered by two or more dressing disks 2 along the axis of the adjusting arm 1 is equal to or less than the radius of the polishing pad 3, and since the polishing pad 3 is in a rotating state during use and dressing, the covering distance can be adopted to enable the two or more dressing disks 2 to cover the whole polishing pad during operation, thereby improving dressing efficiency.

As an alternative embodiment of this embodiment, as shown in fig. 2, each of the trimming disks 2 is drivingly connected to a rotary driving mechanism 7, and each rotary driving mechanism 7 is used for driving the corresponding trimming disk 2 to rotate. Each conditioning disk 2 is driven by a separate rotary drive mechanism 7, so that the rotation of each conditioning disk 2 can be individually adjusted so that each conditioning disk 2 conditions the polishing pad 3 with different rotation parameters. Alternatively, the rotary drive mechanism 7 is a motor, and the dressing disk is in transmission connection with the motor through a belt or a gear.

As an alternative embodiment of the present embodiment, as shown in fig. 2, each of the conditioning disks 2 is connected to a gas pressurizing mechanism 6, and each of the gas pressurizing mechanisms 6 is used to pressurize the corresponding conditioning disk 2. Each of the conditioning disks 2 is pressurized by a separate gas pressurizing mechanism 6, so that the pressure of each conditioning disk 2 can be individually adjusted, and different down pressure parameters are supplied to each conditioning disk 2 during conditioning of the polishing pad 2. Alternatively, the gas pressurizing mechanism 6 is a pneumatic diaphragm. Alternatively, the pneumatic diaphragm is supplied with gas through a medium conduit (not shown in the figures) which is arranged on the adjusting arm.

As an alternative embodiment of the present embodiment, the adjusting arm 1 is connected to a swing driving mechanism (not shown in the figure) for driving the adjusting arm 1 to swing within a predetermined angle. Since there is inevitably a space between two or more dressing disks 2, it is necessary to provide the adjustment arm 1 with a certain swing angle in order to dress the entire surface of the polishing pad 3. Since the present solution has two or more conditioning disks 2, the required swing angle is much smaller than that of the existing single conditioning disk.

The polishing pad dressing apparatus of the present embodiment uses a plurality of dressing disks 2 to dress the surface of the polishing pad 3, and the plurality of dressing disks can cover a wider range, and can cover the radius range of the polishing pad under the optimal condition, so that the surface of the entire polishing pad 3 can be continuously dressed, the reproducibility and the dispersibility of the process are improved, and the service life of the polishing pad can be prolonged. Meanwhile, each dressing disk 3 dresses the surface property of the corresponding area of the grinding pad, and different dressing disks 3 can adjust different rotating speeds or pressing pressures according to the surface property of the corresponding area of the grinding pad, so that different dressing processes can be adopted for different areas, and the uniformity of the wafer can be improved.

The embodiment of the invention also provides a polishing pad dressing device, which is different from the above embodiments in that in the embodiment, two or more dressing disks are in transmission connection with a rotary driving mechanism, and the rotary driving mechanism is used for driving the dressing disks to rotate. In this embodiment, one rotary drive mechanism is used to drive two or more conditioning disks, and as an alternative, the rotary drive mechanism may be drivingly connected to each conditioning disk via a variable transmission ratio transmission mechanism, so that the rotation parameters of each conditioning disk may be adjusted by adjusting the transmission ratio of each transmission mechanism during operation of the conditioning disk. Alternatively, the transmission ratio of the rotary drive mechanism to each conditioning disk may be determined in advance according to the property distribution rule of different regions of the polishing pad, so that the transmission ratio of the rotary drive mechanism to each conditioning disk over time is fixed, but the transmission ratio of the rotary drive mechanism to a plurality of conditioning disks may be different.

This embodiment also allows for individual control of the rotation parameters of each conditioning disk, as well as for different conditioning of different areas of the polishing pad. The same technical effect as the previous embodiment is achieved.

One preferred embodiment is as follows:

the four trimming disks are arranged on the adjusting arm, the sum of the diameters of the four trimming disks is equal to or slightly smaller than the radius of the grinding pad, and the four trimming disks are arranged on the adjusting arm in a linear mode, so that when the adjusting arm points to the center of the grinding pad, the four trimming disks can completely cover the range of one radius of the grinding pad.

The four trimming disks are in one-to-one driving connection with the four rotary driving mechanisms, and the rotary driving mechanisms can adopt motors, so that each motor drives one trimming disk to rotate, the four trimming disks are respectively driven by the four motors, and different rotary parameters are set by each motor, so that each trimming disk can be driven to rotate with different rotary parameters.

The four trimming disks are in one-to-one driving connection with the four gas pressurizing mechanisms, and the gas pressurizing mechanisms can adopt pneumatic membranes, so that each pneumatic membrane pressurizes one trimming disk, and different downforce can be provided for different trimming disks by setting different parameters for different pneumatic membranes.

The adjusting arm is driven by a swing driving mechanism, and drives the trimming disks to swing when the adjusting arm swings, so that the gap of a trimming area caused by the gap between two adjacent trimming disks can be eliminated. In order to avoid overlap of the trimming areas between the trimming disks as much as possible while eliminating the gap between the trimming areas, the swing range of the adjusting arm in this embodiment is much smaller than that of the adjusting arm in the prior art.

In the above-described embodiments, four conditioning disks are used, covering a wide area, enabling continuous conditioning of the entire polishing pad surface, improving process reproducibility and dispersion, and enabling extended polishing pad life. Meanwhile, each dressing disk trims the surface performance of the corresponding area of the grinding pad, different dressing disks can adjust different rotating speeds or pressing pressures according to the surface characteristics of the corresponding grinding pad area, different dressing processes can be adopted for different areas, and therefore the uniformity of the wafer can be improved.

In the above description, the technical details of patterning, etching, and the like of each layer are not described in detail. It will be appreciated by those skilled in the art that layers, regions, etc. of the desired shape may be formed by various technical means. In addition, in order to form the same structure, those skilled in the art can also design a method which is not exactly the same as the method described above. In addition, although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.