EP1728268A1 - Verfahren zur herstellung von verrundeten polysiliziumelektroden auf halbleiterbauelementen - Google Patents
Verfahren zur herstellung von verrundeten polysiliziumelektroden auf halbleiterbauelementenInfo
- Publication number
- EP1728268A1 EP1728268A1 EP06700494A EP06700494A EP1728268A1 EP 1728268 A1 EP1728268 A1 EP 1728268A1 EP 06700494 A EP06700494 A EP 06700494A EP 06700494 A EP06700494 A EP 06700494A EP 1728268 A1 EP1728268 A1 EP 1728268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- polysilicon
- auxiliary layer
- auxiliary
- resist mask
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229910021420 polycrystalline silicon Inorganic materials 0.000 title claims abstract description 41
- 229920005591 polysilicon Polymers 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 27
- 239000004065 semiconductor Substances 0.000 title claims description 9
- 238000004519 manufacturing process Methods 0.000 title description 6
- 238000005530 etching Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000002195 soluble material Substances 0.000 claims abstract description 4
- 229920002120 photoresistant polymer Polymers 0.000 claims description 9
- 238000000206 photolithography Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 239000004922 lacquer Substances 0.000 abstract 1
- 210000000352 storage cell Anatomy 0.000 abstract 1
- 239000003973 paint Substances 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- 239000006117 anti-reflective coating Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 239000012612 commercial material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003631 wet chemical etching Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32139—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer using masks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
- H01L21/0276—Photolithographic processes using an anti-reflective coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/401—Multistep manufacturing processes
- H01L29/4011—Multistep manufacturing processes for data storage electrodes
- H01L29/40114—Multistep manufacturing processes for data storage electrodes the electrodes comprising a conductor-insulator-conductor-insulator-semiconductor structure
Definitions
- the present invention relates to a method with which optimized polysilicon structures, in particular for gate electrodes of memory cells, can be produced.
- conductor tracks or electrodes made of polysilicon are patterned on an upper side.
- a polysilicon layer is applied over the whole area and then patterned using a mask, in particular by means of photoresist and photolithography.
- the polysilicon is removed by etching, which can be done for example by means of RIE (reactive ion etching).
- RIE reactive ion etching
- the gate electrodes are made of transistor structures that are also used for memory cells of semiconductor memory devices.
- EEPROM devices have so-called floating gate electrodes, which are disposed between a control gate electrode over the channel region of the transistor and are electrically isolated all around. During programming, charge carriers are collected on these floating gate electrodes.
- the usual mask technique for structuring semiconductor layers uses photolithography, with which an applied photoresist is exposed to the structures to be produced and then developed. Depending on the type of photoresist, the exposed portions or unexposed portions are removed after development. To improve the optical conditions in photolithography, an antireflection layer is provided under the photoresist.
- the anti-reflection layers are usually very thin in relation to the paint layers.
- a commercial material used as BARC (bottom antireflective coating) is WIDE-15 from Brewer Science.
- the object of the present invention is to provide a method for the production of polysilicon electrodes with sufficiently rounded edges, which is also suitable for very small structural dimensions.
- an auxiliary layer is applied to a polysilicon layer to be structured, which is preferably made of a material suitable for an antireflection layer. Then a resist mask is applied, and the auxiliary layer is laterally provided with cavities, so that in one subsequent etching step for the intended structuring of the polysilicon layer rounded edges are produced.
- the etching step is substantially anisotropic in a direction perpendicular to the top of the device, with the resist mask shielding the etch attack. In the narrow regions of the lateral cavities of the auxiliary layer present under the resist mask, the upper edges of the polysilicon are also subjected to etching attack, albeit to a lesser extent.
- the polysilicon is removed at these points so far that the upper edges of the polysilicon electrodes produced are not sharp-edged or angular, but are formed with fillets. This results in a much better operational performance of the components produced in this way, which is particularly noticeable in the case of the semiconductor memory components with floating gate electrodes mentioned in the introduction.
- a soluble material as an auxiliary layer.
- the lateral cavities in this case can be prepared by applying a suitable solvent, which may be in particular water.
- the described additional method step can be integrated into the customary production method without significant effort, so that after the development and structuring of the photoresist layer to the photoresist mask, the method step for lateral hollowing of the auxiliary layer can be inserted without problems.
- FIG. 1 shows in cross-section an intermediate product of the method after the production of the photoresist mask and the lateral cavities of the auxiliary layer.
- FIG. 2 shows a cross-section according to FIG. 1 after the etching of the polysilicon electrode with rounded edges.
- FIG. 1 shows in cross-section a substrate 1, for example a semiconductor body, with a base layer 2 applied thereto and the polysilicon layer 3 to be patterned.
- the base layer 2 is not essential. This may be, for example, a dielectric layer, which is provided in the production of transistor structures as a gate dielectric, in particular as a gate oxide. However, it can also be one of the customary pad oxide or pad nitride layers.
- the auxiliary layer 4 and a photoresist layer are applied on the upper side, which is patterned photolithographically to the marked paint mask 5.
- the material of the auxiliary layer 4 is preferably soluble, in particular water-soluble.
- the drawn in the figure 1 side cavities 6 are attached, which are formed in particular in an auxiliary layer 4 of a soluble material in the illustrated concave shape.
- the auxiliary layer 4 is preferably made of a suitable anti-reflection layers material, in particular from the above-mentioned BARC WIDE-15. It is according to the invention at most 120 nm thick and preferably, in particular when using WIDE-15, 70 nm to 80 nm thick.
- the polysilicon layer 3 is typically 100 nm to 400 nm thick.
- the polysilicon electrode is made strip-shaped for this purpose; in the figure 1, the longitudinal direction is perpendicular to the plane.
- the hotplate temperature determines the solubility of the material; the higher the temperature, the lower the solubility.
- the development time is preferably about 60 seconds.
- FIG. 2 shows the cross section according to FIG. 1 after the etching process, with which the polysilicon layer is patterned to form the polysilicon electrode 8. It can be clearly seen in FIG. 2 that as a result of the lateral cavities of the auxiliary layer 4, an etching attack has taken place at the upper edges of the polysilicon electrode 8 produced, as a result of which the rounded edges 7 have been formed.
- the etching process is basically a wet-chemical etching process, a dry etching or a thermal process possible. Preference is given to RIE, in which a chemical attack of the etchant takes place at those points of the auxiliary layer 4 at which the auxiliary layer 4 only thinly or no longer covers the polysilicon layer 3 because of the existing lateral cavities 6. This etching attack is sufficient to produce the desired edge rounding.
- a particular advantage of this method is that only a further process step follows the photolithography and structuring of the resist mask to produce the lateral cavities in the auxiliary layer 4, without the subsequent etching step must be modified compared to a standard process. Obtained in this way an exact structuring of the polysilicon electrode 8 with the provided and defined by the resist mask 5 dimensions, in addition, the desired rounding of the edges without changing the lateral dimensions of the polysilicon electrode 8 is achieved.
- a base layer 2, if present as shown in the figures, may function as an etch stop layer in etching the polysilicon layer 3.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Semiconductor Memories (AREA)
- Drying Of Semiconductors (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005004596A DE102005004596B4 (de) | 2005-02-01 | 2005-02-01 | Verfahren zur Herstellung von verrundeten Polysiliziumelektroden auf Halbleiterbauelementen |
PCT/EP2006/000287 WO2006081929A1 (de) | 2005-02-01 | 2006-01-13 | Verfahren zur herstellung von verrundeten polysiliziumelektroden auf halbleiterbauelementen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1728268A1 true EP1728268A1 (de) | 2006-12-06 |
Family
ID=35789280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06700494A Withdrawn EP1728268A1 (de) | 2005-02-01 | 2006-01-13 | Verfahren zur herstellung von verrundeten polysiliziumelektroden auf halbleiterbauelementen |
Country Status (5)
Country | Link |
---|---|
US (1) | US7867837B2 (de) |
EP (1) | EP1728268A1 (de) |
DE (1) | DE102005004596B4 (de) |
TW (1) | TW200639948A (de) |
WO (1) | WO2006081929A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109065764B (zh) * | 2018-08-14 | 2023-04-28 | 京东方科技集团股份有限公司 | 显示面板的制造方法及显示面板 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5804088A (en) * | 1996-07-12 | 1998-09-08 | Texas Instruments Incorporated | Intermediate layer lithography |
US6037246A (en) * | 1996-09-17 | 2000-03-14 | Motorola Inc. | Method of making a contact structure |
KR100240880B1 (ko) * | 1997-08-16 | 2000-01-15 | 윤종용 | 반도체 장치의 게이트 전극 형성 방법 |
WO2001063358A1 (en) * | 2000-02-22 | 2001-08-30 | Brewer Science, Inc. | Organic polymeric antireflective coatings deposited by chemical vapor deposition |
KR100396473B1 (ko) * | 2001-05-29 | 2003-09-02 | 삼성전자주식회사 | 플로팅 게이트를 갖는 반도체 메모리 장치 및 그 제조방법 |
US6699641B1 (en) * | 2001-12-12 | 2004-03-02 | Advanced Micro Devices, Inc. | Photosensitive bottom anti-reflective coating |
KR100466312B1 (ko) * | 2002-08-07 | 2005-01-13 | 삼성전자주식회사 | 유전막을 갖는 반도체 장치의 제조방법 |
US20040077173A1 (en) * | 2002-10-17 | 2004-04-22 | Swaminathan Sivakumar | Using water soluble bottom anti-reflective coating |
US6806531B1 (en) * | 2003-04-07 | 2004-10-19 | Silicon Storage Technology, Inc. | Non-volatile floating gate memory cell with floating gates formed in cavities, and array thereof, and method of formation |
-
2005
- 2005-02-01 DE DE102005004596A patent/DE102005004596B4/de not_active Expired - Fee Related
-
2006
- 2006-01-13 WO PCT/EP2006/000287 patent/WO2006081929A1/de active Application Filing
- 2006-01-13 US US11/795,933 patent/US7867837B2/en not_active Expired - Fee Related
- 2006-01-13 EP EP06700494A patent/EP1728268A1/de not_active Withdrawn
- 2006-01-23 TW TW095102416A patent/TW200639948A/zh unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2006081929A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090197407A1 (en) | 2009-08-06 |
DE102005004596B4 (de) | 2011-09-15 |
WO2006081929A1 (de) | 2006-08-10 |
US7867837B2 (en) | 2011-01-11 |
DE102005004596A1 (de) | 2006-08-10 |
TW200639948A (en) | 2006-11-16 |
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Legal Events
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DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
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18W | Application withdrawn |
Effective date: 20090520 |