Method for manufacturing semiconductor device
阅读说明:本技术 一种半导体器件的制造方法 (Method for manufacturing semiconductor device ) 是由 张超然 李赟 周俊 于 2019-11-08 设计创作,主要内容包括:本发明提供一种半导体器件的制造方法,提供衬底,所述衬底上形成有浮栅以及其上的堆叠层,所述堆叠层包括依次层叠的隔离层、控制栅和保护层,所述堆叠层的侧壁上形成有侧墙,所述堆叠层一侧为擦除栅区、另一侧为字线区,所述擦除栅区一侧的浮栅延伸至所述堆叠层以及所述侧墙之外,所述擦除栅区一侧形成有擦除栅,所述字线区一侧形成有字线;选择性去除所述保护层;在所述擦除栅、字线以及控制栅上形成接触塞。该方法无需额外的掩膜和光刻工艺,简化了制造半导体器件的工艺流程,降低了器件的制造成本。(The invention provides a manufacturing method of a semiconductor device, which comprises the steps of providing a substrate, wherein a floating gate and a stack layer on the floating gate are formed on the substrate, the stack layer comprises an isolation layer, a control gate and a protective layer which are sequentially stacked, a side wall is formed on the side wall of the stack layer, one side of the stack layer is an erasing gate region, the other side of the stack layer is a word line region, the floating gate on one side of the erasing gate region extends out of the stack layer and the side wall, an erasing gate is formed on one side of the erasing gate region, and a word line is formed on one side of the word line region; selectively removing the protective layer; and forming contact plugs on the erasing gate, the word line and the control gate. The method does not need extra mask and photoetching process, simplifies the process flow of manufacturing the semiconductor device and reduces the manufacturing cost of the device.)
1. A method of manufacturing a semiconductor device, comprising:
providing a substrate, wherein a floating gate and a stack layer on the floating gate are formed on the substrate, the stack layer comprises an isolation layer, a control gate and a protective layer which are sequentially stacked, a side wall is formed on the side wall of the stack layer, one side of the stack layer is an erasing gate region, the other side of the stack layer is a word line region, the floating gate on one side of the erasing gate region extends out of the stack layer and the side wall, an erasing gate is formed on one side of the erasing gate region, and a word line is formed on one side of the word line region;
selectively removing the protective layer;
and forming contact plugs on the erasing gate, the word line and the control gate.
2. The method of manufacturing according to claim 1, wherein the protective layer is selectively removed using wet etching.
3. The method of claim 2, wherein the erase gate, the word line, and the control gate are polysilicon, the protective layer is silicon nitride, and the wet etching uses phosphoric acid as a solution.
4. The method as claimed in claim 2, wherein the protective layer has a thickness in the range of 100-200 angstroms before selectively removing the protective layer by wet etching.
5. The manufacturing method according to any one of claims 1 to 4, wherein the floating gate and the stacked layer are formed by a method comprising:
depositing a floating gate layer, an isolation layer, a control gate and a protection layer on the substrate in sequence;
patterning the isolation layer, the control gate and the protection layer to form a stacked layer;
forming a side wall on the side wall of the stacked layer;
forming a sacrificial layer on the side wall of the side wall on one side of the stacked layer;
patterning the floating gate layer by taking the stacked layer and the sacrificial layer as masks to form a floating gate, wherein one side of the sacrificial layer is an erasing gate region, and the other side of the sacrificial layer is a word line region;
and removing the sacrificial layer.
6. The manufacturing method according to claim 5, wherein the sidewall spacer comprises a silicon oxide layer and a silicon nitride layer stacked in this order from the sidewall of the stacked layer.
7. The method as claimed in claim 5, wherein the thickness of the passivation layer deposited on the substrate is in the range of 600-700 angstroms; before selectively removing the protective layer by wet etching, the thickness of the protective layer is in the range of 100-200 angstroms.
8. The manufacturing method according to claim 5, wherein the sacrificial layer is a silicon oxide layer.
9. The method as claimed in claim 8, wherein the thickness of the sacrificial layer is in the range of 300-350 angstroms.
10. The method of manufacturing according to claim 1, wherein the step of forming the contact plug on the erase gate, the word line, and the control gate comprises:
forming a dielectric layer on the erasing gate, the word line and the control gate;
forming a contact hole in the dielectric layer;
and filling the contact hole to form the contact plug.
Technical Field
The present invention relates to semiconductor devices and manufacturing methods thereof, and more particularly, to a method for manufacturing a semiconductor device.
Background
With the continuous development of semiconductor technology, semiconductor devices including floating gate type flash memories are widely used. The floating gate type flash memory is a nonvolatile memory and has the advantages of high integration level, high storage speed, easy erasing and rewriting and the like. However, as the feature size of integrated circuits is continuously reduced, the fabrication process of semiconductor devices is complicated and the manufacturing cost is high.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for manufacturing a semiconductor device, which simplifies the manufacturing process of the semiconductor device and reduces the manufacturing cost.
In order to achieve the purpose, the invention has the following technical scheme:
a method of manufacturing a semiconductor device, comprising:
providing a substrate, wherein a floating gate and a stack layer on the floating gate are formed on the substrate, the stack layer comprises an isolation layer, a control gate and a protective layer which are sequentially stacked, a side wall is formed on the side wall of the stack layer, one side of the stack layer is an erasing gate region, the other side of the stack layer is a word line region, the floating gate on one side of the erasing gate region extends out of the stack layer and the side wall, an erasing gate is formed on one side of the erasing gate region, and a word line is formed on one side of the word line region;
selectively removing the protective layer;
and forming contact plugs on the erasing gate, the word line and the control gate.
Optionally, the protective layer is selectively removed by wet etching.
Optionally, the erase gate, the word line and the control gate are polysilicon, the protective layer is silicon nitride, and the solution adopted in the wet etching is phosphoric acid.
Optionally, before selectively removing the protection layer by wet etching, the thickness of the protection layer ranges from 100 to 200 angstroms.
Optionally, the method for forming the floating gate and the stacked layer includes:
depositing a floating gate layer, an isolation layer, a control gate and a protection layer on the substrate in sequence;
patterning the isolation layer, the control gate and the protection layer to form a stacked layer;
forming a side wall on the side wall of the stacked layer;
forming a sacrificial layer on the side wall of the side wall on one side of the stacked layer;
patterning the floating gate layer by taking the stacked layer and the sacrificial layer as masks to form a floating gate, wherein one side of the sacrificial layer is an erasing gate region, and the other side of the sacrificial layer is a word line region;
and removing the sacrificial layer.
Optionally, the sidewall spacer includes a silicon oxide layer and a silicon nitride layer stacked in sequence from a sidewall of the stacked layer.
Optionally, the thickness of the protective layer deposited on the substrate is in the range of 600-700 angstroms; before selectively removing the protective layer by wet etching, the thickness of the protective layer is in the range of 100-200 angstroms.
Optionally, the sacrificial layer is a silicon oxide layer.
Optionally, the thickness of the sacrificial layer ranges from 300 to 350 angstroms.
Optionally, the step of forming the contact plugs on the erase gate, the word line, and the control gate includes:
forming a dielectric layer on the erasing gate, the word line and the control gate;
forming a contact hole in the dielectric layer;
and filling the contact hole to form the contact plug.
The method for manufacturing the semiconductor device provided by the embodiment of the invention comprises the steps of forming a floating gate and a stacked layer on a substrate, wherein the stacked layer comprises an isolation layer, a control gate and a protective layer which are sequentially stacked, a side wall is formed on the side wall of the stacked layer, one side of the stacked layer is an erasing gate region, the other side of the stacked layer is a word line region, the floating gate on one side of the erasing gate region extends out of the stacked layer and the side wall, an erasing gate is formed on one side of the erasing gate region, a word line is formed on one side of the word line region, then, the protective layer is selectively removed without photoetching, masking and other processes, the protective layer is selectively removed, and then contact plugs are formed on the. The method simplifies the process flow of manufacturing the semiconductor device and reduces the manufacturing cost of the device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic flow diagram of a method of manufacturing a semiconductor device according to an embodiment of the invention;
fig. 2-17 are schematic diagrams illustrating cross-sectional structures of semiconductor devices formed by a method of manufacturing a semiconductor device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials. In addition, the structure of a first feature described below as "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.
As described in the background, as the feature size of integrated circuits is continuously reduced, the fabrication process of semiconductor devices including floating gate type flash memories is complicated and the fabrication cost is high.
Therefore, the application provides a manufacturing method of a semiconductor device, a floating gate and a stack layer are formed on a substrate, the stack layer comprises an isolation layer, a control gate and a protective layer which are sequentially stacked, a side wall is formed on the side wall of the stack layer, one side of the stack layer is an erasing gate region, the other side of the stack layer is a word line region, the floating gate on one side of the erasing gate region extends out of the stack layer and the side wall, an erasing gate is formed on one side of the erasing gate region, a word line is formed on one side of the word line region, the protective layer in the stack layer is selectively removed after the erasing gate and the word line are formed so as to lead out the control gate, the protective layer is selectively removed without processes of photoetching, masking and the like in the process of removing the protective layer, and then contact plugs. The method simplifies the process flow of manufacturing the semiconductor device and reduces the manufacturing cost of the device.
In order to better understand the technical solution and technical effects of the present application, the following detailed description of specific embodiments will be made with reference to the flowchart 1 and the accompanying fig. 2-17.
Referring to fig. 1, in step S01, a
In the embodiment of the present application, the
In this embodiment, the floating gate 102' and the
In this embodiment, a
In step S102, the
In this embodiment, a
In step S103,
In the embodiment of the present invention, the
In this embodiment, the
In this embodiment, for convenience of description, the sidewalls on the sidewalls of the
In step S104, a
In this embodiment, the
In step S105, the
In the embodiment of the present application, the
In step S106, the
After the floating gate 102 'is formed, the
In this embodiment, a
In this embodiment, the tunnel oxide material on the surface of the
Then, referring to fig. 13, an erase
In step S02, the
Thus, the device structure is formed, in the whole forming process, the
In a specific application, the initial thickness of the
In the embodiment of the present application, the wet etching may be used to remove the
In this embodiment, the erase
In another embodiment, a dry etching process may also be used to selectively remove the
In step S03, contact plugs 120 are formed on the erase
In the embodiment of the present invention, a
In this embodiment, a
The filling of the contact hole 120' is performed to form the
The foregoing is only a preferred embodiment of the present invention, and although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
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