US20080185676A1 - Method for forming STI of semiconductor device - Google Patents
Method for forming STI of semiconductor device Download PDFInfo
- Publication number
- US20080185676A1 US20080185676A1 US12/078,967 US7896708A US2008185676A1 US 20080185676 A1 US20080185676 A1 US 20080185676A1 US 7896708 A US7896708 A US 7896708A US 2008185676 A1 US2008185676 A1 US 2008185676A1
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- United States
- Prior art keywords
- trench
- epitaxial silicon
- silicon layer
- forming
- pad
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- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/76224—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
Definitions
- the present invention relates to a method for forming shallow trench isolation (STI) of a semiconductor device, and more particularly, to a method for easily forming a top rounded corner during the STI process when manufacturing a transistor of a semiconductor device so as to enhance junction leakage and isolation characteristics.
- STI shallow trench isolation
- FIG. 1 illustrates a diagram showing a conventional process for forming a STI in a conventional semiconductor device.
- an oxide film and a nitride film are successively deposited on a silicon substrate S 1 .
- a pattern is formed on the nitride film, the nitride film and the oxide film are etched, and then silicon used for the STI is etched.
- a filing oxide film S 3 is formed and a trench is deposited on a liner oxide film S 2 .
- CMP chemical mechanical planarization
- the present invention is directed to a method for forming a STI for a semiconductor device that substantially obviates the above-identified and other problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a method for forming STI of a semiconductor device, in which top corner rounding is easily carried out during the STI process while manufacturing a transistor of a semiconductor device so as to enhance junction leakage and isolation characteristics.
- a method for forming STI of a semiconductor device includes the steps of preparing a semiconductor substrate having an active region and a field region defined thereon; forming a pad oxide film and a pad nitride film on the semiconductor substrate; selectively etching the pad oxide film, the pad nitride film and the semiconductor substrate on the field region to form a trench; selectively growing an epitaxial silicon layer on a surface of the trench; forming a liner oxide layer on the epitaxial silicon layer; and forming a STI in the trench.
- FIG. 1 illustrates a process for forming shallow trench isolation (STI) of a conventional semiconductor device
- FIGS. 2A-2D illustrate a process for forming a shallow trench isolation (STI) of a semiconductor device in accordance with the present invention.
- STI shallow trench isolation
- FIGS. 2A-2D illustrate a diagram showing a process of forming a STI of a semiconductor device.
- a silicon substrate (SS 1 ) is prepared, wherein the substrate has an active region and a field region thereon.
- a pad oxide film (SS 2 ) and a nitride film (SS 3 ) are sequentially formed on the silicon substrate (SS 1 ), and a photoresist pattern (SS 4 ) is formed on the pad nitride film (SS 3 ) above the active region.
- the pad oxide film (SS 2 ) and the pad nitride film (SS 3 ) above the field region are etched using the photoresist pattern (SS 4 ) as a mask.
- the substrate (SS 1 ) of the field region is etched to form a trench.
- the photoresist pattern (SS 4 ) is removed.
- epitaxial silicon (SS 5 ) is grown on a surface of the trench.
- the epitaxial silicon (SS 5 ) is not grown in an edge region, a top thereof is naturally rounded as illustrated in FIG. 2C .
- the liner oxide layer (SS 6 ) is formed on the epitaxial silicon (SS 5 ). Subsequently, an oxide layer is formed on an entire surface of the substrate so as to fill the trench, and then CMP is carried out so as to form a STI (SS 7 ).
- a last process step is forming a general transistor, in which a gate pattern is formed, and then a gate is formed through a gate etch process.
- the present invention described above has an effect of naturally forming a top corner rounding without adding a new pattern process because junction leakage and isolation characteristics are improved by easily carrying out the top corner rounding in the STI process.
Abstract
A method for forming a STI of a semiconductor device includes steps of sequentially forming a pad oxide film and a pad nitride film on the semiconductor device and carrying out a pattern process PR; etching the pad oxide film and the nitride film and carrying out a cleaning process; selectively growing epitaxial silicon; and carrying out liner oxidation on the epitaxial silicon and carrying out CMP so as to form an oxidation fill and STI.
Description
- 1. Field of the Invention
- The present invention relates to a method for forming shallow trench isolation (STI) of a semiconductor device, and more particularly, to a method for easily forming a top rounded corner during the STI process when manufacturing a transistor of a semiconductor device so as to enhance junction leakage and isolation characteristics.
- 2. Discussion of the Related Art
- Generally, as semiconductor devices become more highly integrated and miniaturized while having higher speeds, more improved junction leakage and insulation characteristics are demanded.
-
FIG. 1 illustrates a diagram showing a conventional process for forming a STI in a conventional semiconductor device. Referring toFIG. 1 , an oxide film and a nitride film are successively deposited on a silicon substrate S1. Then, a pattern is formed on the nitride film, the nitride film and the oxide film are etched, and then silicon used for the STI is etched. Thereafter, a filing oxide film S3 is formed and a trench is deposited on a liner oxide film S2. Subsequently, chemical mechanical planarization (CMP) is performed and the nitride film is removed so as to form the STI. In this case, and as recognized by the present inventor, if the top corner of the liner oxide film S2 is not rounded after etching the silicon used for STI and completing the formation of the liner oxide film, a current is concentrated to a portion which is not rounded, thereby causing a problem of unacceptably high leakage characteristics. - As recognized by the present inventor an anomaly in a voltage characteristic of certain transistors is described as a “double hump” characteristic. The present inventor was able to associate this double hump characteristic with the lack of rounded edges at the top corner of the liner oxide film S2.
- Accordingly, the present invention is directed to a method for forming a STI for a semiconductor device that substantially obviates the above-identified and other problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a method for forming STI of a semiconductor device, in which top corner rounding is easily carried out during the STI process while manufacturing a transistor of a semiconductor device so as to enhance junction leakage and isolation characteristics.
- Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a method for forming STI of a semiconductor device includes the steps of preparing a semiconductor substrate having an active region and a field region defined thereon; forming a pad oxide film and a pad nitride film on the semiconductor substrate; selectively etching the pad oxide film, the pad nitride film and the semiconductor substrate on the field region to form a trench; selectively growing an epitaxial silicon layer on a surface of the trench; forming a liner oxide layer on the epitaxial silicon layer; and forming a STI in the trench.
- It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings;
-
FIG. 1 illustrates a process for forming shallow trench isolation (STI) of a conventional semiconductor device; and -
FIGS. 2A-2D illustrate a process for forming a shallow trench isolation (STI) of a semiconductor device in accordance with the present invention. - Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
- Hereinafter, a structure and function of the present invention will be described referring to the appended drawings.
FIGS. 2A-2D illustrate a diagram showing a process of forming a STI of a semiconductor device. In other words, referring toFIG. 2A , a silicon substrate (SS1) is prepared, wherein the substrate has an active region and a field region thereon. A pad oxide film (SS2) and a nitride film (SS3) are sequentially formed on the silicon substrate (SS1), and a photoresist pattern (SS4) is formed on the pad nitride film (SS3) above the active region. - As illustrated in
FIG. 2B , the pad oxide film (SS2) and the pad nitride film (SS3) above the field region are etched using the photoresist pattern (SS4) as a mask. And the substrate (SS1) of the field region is etched to form a trench. The photoresist pattern (SS4) is removed. - Subsequently, after the cleaning is carried out, as illustrated in
FIG. 2C , epitaxial silicon (SS5) is grown on a surface of the trench. In this case, since the epitaxial silicon (SS5) is not grown in an edge region, a top thereof is naturally rounded as illustrated inFIG. 2C . - Next, referring to
FIG. 2D , after the epitaxial silicon (SS5) is grown, the liner oxide layer (SS6) is formed on the epitaxial silicon (SS5). Subsequently, an oxide layer is formed on an entire surface of the substrate so as to fill the trench, and then CMP is carried out so as to form a STI (SS7). - A last process step is forming a general transistor, in which a gate pattern is formed, and then a gate is formed through a gate etch process.
- The present invention described above has an effect of naturally forming a top corner rounding without adding a new pattern process because junction leakage and isolation characteristics are improved by easily carrying out the top corner rounding in the STI process.
- This application claims the benefit of Korean patent application No. P2004-01126, filed on Dec. 31, 2003, the entire contents of which is hereby incorporated by reference as if fully set forth herein.
- It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1-3. (canceled)
4. A method for forming a shallow trench isolation (STI) of a semiconductor device, comprising:
forming a trench by removing selected portions of a pad nitride film and a pad oxide film and a portion of a semiconductor substrate underlying the pad oxide film;
forming a voltage characteristic anomaly attenuating structure by selectively growing an epitaxial silicon layer on a surface of the trench so as to have a rounded edge at a top portion adjacent to an opening edge of the trench;
forming a liner oxide layer on the epitaxial silicon layer; and
filling a void within the liner oxide layer with an oxide material.
5. The method of claim 4 , further comprising performing a CMP (Chemical Mechanical Polishing) process on an upper surface of the oxide material filled into the void to form the STI.
6. A shallow trench isolation formed using a method, comprising: preparing a semiconductor substrate having an active region and a field region defined thereon;
forming, in succession, a pad oxide film and a pad nitride film on the semiconductor substrate by selectively etching the pad oxide film, the nitride film and the semiconductor substrate on the field region, to form a trench;
selectively growing an epitaxial silicon layer on a surface of the trench, including forming a rounded edge at a top portion of said epitaxial silicon layer adjacent to a top opening edge of said trench;
forming a liner oxide layer on the epitaxial silicon layer; and
forming a STI in the trench.
7. A shallow trench isolation formed using a method, comprising:
forming, in succession, a pad oxide film and a pad nitride film on a semiconductor substrate having an active region and a field region defined therein;
selectively removing portions of the pad oxide film, the nitride film and the semiconductor substrate on the field region to form a trench;
selectively growing an epitaxial silicon layer on a surface of the trench, including forming a rounded edge at a top portion of said epitaxial silicon layer adjacent to a top opening edge of said trench; and
forming a liner oxide layer on the epitaxial silicon layer; and
forming a STI in the trench.
8. A shallow trench isolation formed using the method of claim 4 .
9. A shallow trench isolation formed using the method of claim 5 .
10. A shallow trench isolation (STI) of a semiconductor device, comprising:
a trench structure extending through a pad nitride film, a pad oxide film and into an underlying portion of a semiconductor substrate;
an epitaxial silicon layer on a surface of the trench;
a voltage characteristic anomaly attenuating structure comprising a rounded edge on a top portion of the epitaxial silicon layer adjacent to an opening edge of the trench;
a liner oxide layer on the epitaxial silicon layer; and
an oxide material filing the void within the linear oxide layer and pad nitride film.
11. A shallow trench isolation (STI) of a semiconductor device, comprising:
a trench structure extending through a pad nitride film, a pad oxide film and into an underlying portion of a semiconductor substrate;
an epitaxial silicon layer on a surface of the trench;
means for attenuating a voltage characteristic anomaly associated with the epitaxial silicon layer;
a liner oxide layer on the epitaxial silicon layer; and
an oxide material filing the void within the linear oxide layer and pad nitride film.
12. A shallow trench isolation of claim 11 , wherein the voltage characteristic anomaly attenuating means comprises rounded edge on a top portion of the epitaxial silicon layer adjacent to an opening edge of the trench.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/078,967 US20080185676A1 (en) | 2003-12-31 | 2008-04-09 | Method for forming STI of semiconductor device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020030101126A KR100559518B1 (en) | 2003-12-31 | 2003-12-31 | Method for formating sti in semiconductor |
KR10-2003-0101126 | 2003-12-31 | ||
US11/024,439 US7371656B2 (en) | 2003-12-31 | 2004-12-30 | Method for forming STI of semiconductor device |
US12/078,967 US20080185676A1 (en) | 2003-12-31 | 2008-04-09 | Method for forming STI of semiconductor device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/024,439 Division US7371656B2 (en) | 2003-12-31 | 2004-12-30 | Method for forming STI of semiconductor device |
Publications (1)
Publication Number | Publication Date |
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US20080185676A1 true US20080185676A1 (en) | 2008-08-07 |
Family
ID=34698859
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/024,439 Active 2025-07-29 US7371656B2 (en) | 2003-12-31 | 2004-12-30 | Method for forming STI of semiconductor device |
US12/078,967 Abandoned US20080185676A1 (en) | 2003-12-31 | 2008-04-09 | Method for forming STI of semiconductor device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/024,439 Active 2025-07-29 US7371656B2 (en) | 2003-12-31 | 2004-12-30 | Method for forming STI of semiconductor device |
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US (2) | US7371656B2 (en) |
KR (1) | KR100559518B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070164391A1 (en) * | 2006-01-13 | 2007-07-19 | Ki-Seog Youn | Trench isolation type semiconductor device and related method of manufacture |
CN102437082A (en) * | 2011-08-15 | 2012-05-02 | 上海华力微电子有限公司 | Method for improving filling performance in ultra-high depth-to-width ratio shallow trench isolation (STI) process |
US8685816B2 (en) * | 2012-06-11 | 2014-04-01 | Globalfoundries Inc. | Methods of forming semiconductor devices by forming semiconductor channel region materials prior to forming isolation structures |
US11232973B2 (en) | 2019-06-21 | 2022-01-25 | Samsung Electronics Co., Ltd. | Semiconductor device and method of fabricating the same |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7157385B2 (en) * | 2003-09-05 | 2007-01-02 | Micron Technology, Inc. | Method of depositing a silicon dioxide-comprising layer in the fabrication of integrated circuitry |
US6300219B1 (en) * | 1999-08-30 | 2001-10-09 | Micron Technology, Inc. | Method of forming trench isolation regions |
US7125815B2 (en) * | 2003-07-07 | 2006-10-24 | Micron Technology, Inc. | Methods of forming a phosphorous doped silicon dioxide comprising layer |
US7053010B2 (en) * | 2004-03-22 | 2006-05-30 | Micron Technology, Inc. | Methods of depositing silicon dioxide comprising layers in the fabrication of integrated circuitry, methods of forming trench isolation, and methods of forming arrays of memory cells |
US7235459B2 (en) * | 2004-08-31 | 2007-06-26 | Micron Technology, Inc. | Methods of forming trench isolation in the fabrication of integrated circuitry, methods of fabricating memory circuitry, integrated circuitry and memory integrated circuitry |
US7217634B2 (en) * | 2005-02-17 | 2007-05-15 | Micron Technology, Inc. | Methods of forming integrated circuitry |
US7510966B2 (en) * | 2005-03-07 | 2009-03-31 | Micron Technology, Inc. | Electrically conductive line, method of forming an electrically conductive line, and method of reducing titanium silicide agglomeration in fabrication of titanium silicide over polysilicon transistor gate lines |
US8012847B2 (en) | 2005-04-01 | 2011-09-06 | Micron Technology, Inc. | Methods of forming trench isolation in the fabrication of integrated circuitry and methods of fabricating integrated circuitry |
US7544548B2 (en) * | 2006-05-31 | 2009-06-09 | Freescale Semiconductor, Inc. | Trench liner for DSO integration |
KR100895810B1 (en) * | 2006-07-31 | 2009-05-08 | 주식회사 하이닉스반도체 | Method for forming isolation layer of semiconductor device |
US20090096055A1 (en) * | 2007-10-16 | 2009-04-16 | Texas Instruments Incorporated | Method to form cmos circuits with sub 50nm sti structures using selective epitaxial silicon post sti etch |
EP2232533A1 (en) * | 2008-01-16 | 2010-09-29 | Ipdia | High aspect ratio holes or trenches |
US8105956B2 (en) | 2009-10-20 | 2012-01-31 | Micron Technology, Inc. | Methods of forming silicon oxides and methods of forming interlevel dielectrics |
US8269307B2 (en) * | 2010-11-19 | 2012-09-18 | Institute of Microelectronics, Chinese Academy of Sciences | Shallow trench isolation structure and method for forming the same |
US10872918B2 (en) * | 2017-03-28 | 2020-12-22 | Taiwan Semiconductor Manufacturing Co., Ltd. | Optical isolation structure for reducing crosstalk between pixels and fabrication method thereof |
TWI671853B (en) | 2017-05-02 | 2019-09-11 | 聯華電子股份有限公司 | Semiconductor structure for preventing generation of void and method for manufacturing the same |
Citations (3)
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US6221733B1 (en) * | 1998-11-13 | 2001-04-24 | Lattice Semiconductor Corporation | Reduction of mechanical stress in shallow trench isolation process |
US20050009295A1 (en) * | 2002-03-07 | 2005-01-13 | International Business Machines Corporation | Novel method to achieve increased trench depth, independent of CD as defined by lithography |
US20050095807A1 (en) * | 2003-01-14 | 2005-05-05 | Advanced Micro Devices, Inc. | Silicon buffered shallow trench isolation for strained silicon processes |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20020019287A (en) * | 2000-09-05 | 2002-03-12 | 박종섭 | Method for fabricating trench in semiconductor device |
-
2003
- 2003-12-31 KR KR1020030101126A patent/KR100559518B1/en not_active IP Right Cessation
-
2004
- 2004-12-30 US US11/024,439 patent/US7371656B2/en active Active
-
2008
- 2008-04-09 US US12/078,967 patent/US20080185676A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6221733B1 (en) * | 1998-11-13 | 2001-04-24 | Lattice Semiconductor Corporation | Reduction of mechanical stress in shallow trench isolation process |
US20050009295A1 (en) * | 2002-03-07 | 2005-01-13 | International Business Machines Corporation | Novel method to achieve increased trench depth, independent of CD as defined by lithography |
US20050095807A1 (en) * | 2003-01-14 | 2005-05-05 | Advanced Micro Devices, Inc. | Silicon buffered shallow trench isolation for strained silicon processes |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070164391A1 (en) * | 2006-01-13 | 2007-07-19 | Ki-Seog Youn | Trench isolation type semiconductor device and related method of manufacture |
US7557415B2 (en) * | 2006-01-13 | 2009-07-07 | Samsung Electroncis Co., Ltd. | Trench isolation type semiconductor device and related method of manufacture |
CN102437082A (en) * | 2011-08-15 | 2012-05-02 | 上海华力微电子有限公司 | Method for improving filling performance in ultra-high depth-to-width ratio shallow trench isolation (STI) process |
US8685816B2 (en) * | 2012-06-11 | 2014-04-01 | Globalfoundries Inc. | Methods of forming semiconductor devices by forming semiconductor channel region materials prior to forming isolation structures |
US11232973B2 (en) | 2019-06-21 | 2022-01-25 | Samsung Electronics Co., Ltd. | Semiconductor device and method of fabricating the same |
US11715666B2 (en) | 2019-06-21 | 2023-08-01 | Samsung Electronics Co., Ltd. | Method of fabricating semiconductor device |
Also Published As
Publication number | Publication date |
---|---|
KR100559518B1 (en) | 2006-03-15 |
US7371656B2 (en) | 2008-05-13 |
KR20050069172A (en) | 2005-07-05 |
US20050142799A1 (en) | 2005-06-30 |
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Owner name: DONGBU ELECTRONICS CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SEO, YOUNG HUN;REEL/FRAME:020820/0681 Effective date: 20041223 |
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