DE19625404B4 - Method for producing a field oxide layer in a semiconductor device - Google Patents
Method for producing a field oxide layer in a semiconductor device Download PDFInfo
- Publication number
- DE19625404B4 DE19625404B4 DE19625404A DE19625404A DE19625404B4 DE 19625404 B4 DE19625404 B4 DE 19625404B4 DE 19625404 A DE19625404 A DE 19625404A DE 19625404 A DE19625404 A DE 19625404A DE 19625404 B4 DE19625404 B4 DE 19625404B4
- Authority
- DE
- Germany
- Prior art keywords
- oxide layer
- silicon substrate
- approximately
- layer
- nitride
- 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.)
- Expired - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000004065 semiconductor Substances 0.000 title claims abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 38
- 239000010703 silicon Substances 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 29
- 150000004767 nitrides Chemical class 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000001301 oxygen Substances 0.000 claims abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract 2
- 230000003647 oxidation Effects 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 238000005530 etching Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 230000035515 penetration Effects 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 241000293849 Cordylanthus Species 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001039 wet 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
- H01L21/32—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 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
- H01L21/70—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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Local Oxidation Of Silicon (AREA)
- Element Separation (AREA)
Abstract
Verfahren
zur Herstellung einer Feldoxidschicht (6) in einer Halbleitervorrichtung,
mit folgenden Schritten:
Bereitstellung eines Siliziumsubstrat
(1);
Erzeugung einer Oxidschicht (2) auf dem Siliziumsubstrat (1);
Eindringenlassen
von Stickstoff in die Oxidschicht (2), um zu verhindem, dass Sauerstoff
entlang der Grenzfläche zwischen
dem Siliziumsubstrat und der Oxidschicht eindiffundiert, durch Einwirkenlassen
eines Wärmebehandlungsvorgangs
auf das Siliziumsubstrat in einer stickstoffhaltigen Gasatmosphäre, sodass
eine Oxidschicht (2) erhalten wird, die Stickstoffatome in der Nähe der Grenzfläche zu dem
Siliziumsubstrat enthält,
wobei der Wärmebehandlungsvorgang
bei einer Temperatur von annähernd
800° bis
1100° Celsius
und 30 Minuten bis 120 Minuten lang bei einem Druck von annähernd 13,3
mbar bis 133 mbar durchgeführt wird;
Ausbildung
einer Nitridschicht (4) unmittelbar auf der Oxidschicht (2);
Erzeugung
eines Musters auf der Nitridschicht (4) und der Oxidschicht (2);
wodurch ein Feldbereich des Siliziumsubstrats (1) freigelegt wird;
Erzeugung
eines Nitrid-Abstandsstücks
(5) auf der Seitenwand der Nitridschicht (4) und...Method for producing a field oxide layer (6) in a semiconductor device, comprising the following steps:
Providing a silicon substrate (1);
Forming an oxide layer (2) on the silicon substrate (1);
Permitting nitrogen to enter the oxide layer (2) to prevent oxygen from diffusing along the interface between the silicon substrate and the oxide layer by exposing the silicon substrate in a nitrogen-containing gas atmosphere to an oxide layer (2) containing nitrogen atoms in the vicinity of the interface with the silicon substrate, wherein the heat treatment process is carried out at a temperature of approximately 800 ° to 1100 ° C and for 30 minutes to 120 minutes at a pressure of approximately 13.3 mbar to 133 mbar;
Forming a nitride layer (4) directly on the oxide layer (2);
Forming a pattern on the nitride layer (4) and the oxide layer (2); whereby a field region of the silicon substrate (1) is exposed;
Generation of a nitride spacer (5) on the sidewall of the nitride layer (4) and ...
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Feldoxidschicht zum Isolieren eines Bauteils in bezug auf eine elektrische Verbindung zu anderen Bauteilen, und betrifft insbesondere einen Vorgang zur Vergrößerung eines aktiven Bereichs unter Verwendung eines Wärmeanlassvorgangs mit NH3-Gas.The present invention relates to a method for producing a field oxide layer for insulating a component with respect to an electrical connection to other components, and more particularly relates to an operation for enlarging an active area using a heat starting operation with NH 3 gas.
Im Allgemeinen wurde bisher eine Feldoxidschicht zum elektrischen Isolieren von Bauteilen durch LOCOS-Verfahren (lokale Oxidation von Silizium) hergestellt, welches einen lokalen Bereich eines Siliziumsubstrats unter Verwendung einer Oxidationsmaskenschicht, wie beispielsweise einer Nitridschicht, oxidiert. Da jedoch das LOCOS-Verfahren einen sogenannten Vogelschnabel bildet, der den aktiven Bereich des Bauteils verringert, werden nunmehr in der Praxis modifizierte LOCOS-Verfahren verwendet, beispielsweise das OSELO-Verfahren (Offset-LOCOS) und das MOSELO-Verfahren (modifiziertes OSELO-Verfahren).in the Generally, a field oxide film for electrical insulation has hitherto been used of components by LOCOS process (local oxidation of silicon) which is a local area of a silicon substrate using an oxidation mask layer, such as a nitride layer, oxidized. However, since the LOCOS method has a so-called bird's beak forms the active area of the component reduced in practice, modified LOCOS methods are now used, For example, the OSELO method (offset LOCOS) and the MOSELO method (modified OSELO method).
Bei dem OSELO-Verfahren wird ein Graben in dem Siliziumsubstrat ausgebildet, bevor dieses oxidiert wird. Vor der Oxidation des Siliziumsubstrats zur Herstellung der Feldoxidschicht (wobei eine Anschlussflächen-Oxidschicht und eine Oxidationsmaskenschicht (Nitrid) vorher mit einem Muster versehen werden, und ein Bauteileisolationsbereich des Siliziumsubstrats freigelegt wird) wird ein Nitrid-Abstandsstück auf der Seitenwand der Oxidationsmaskenschicht hergestellt, und ein Graben dadurch gebildet, dass das Siliziumsubstrat auf eine Dicke von annähernd 30 bis 70 nm geätzt wird. Dieses Nitrid-Abstandsstück verhindert eine Erzeugung einer Oxidation des Siliziumsubstrats in der Grenzfläche zwischen der Anschlussflächen-Oxidschicht und dem Siliziumsubstrat.at the OSELO method, a trench is formed in the silicon substrate, before it is oxidized. Before the oxidation of the silicon substrate to Preparation of the field oxide layer (wherein a pad oxide layer and an oxidation mask layer (nitride) beforehand with a pattern and a device isolation region of the silicon substrate is exposed) becomes a nitride spacer on the sidewall of the oxidation mask layer made, and a trench formed by the fact that the silicon substrate to a thickness of approximately Etched 30 to 70 nm becomes. This nitride spacer prevents generation of oxidation of the silicon substrate in the interface between the pad oxide layer and the silicon substrate.
Je größer allerdings die Breite des Nitrid-Abstandsstücks ist, desto enger ist der zu oxidierende Bereich. Die Verwendung des Nitrid-Abstandsstücks wie voranstehend geschildert beeinträchtigt daher die Isolierwirkung. Andererseits besteht bei dem OSELO-Verfahren das Problem, dass eine sehr geringe Breite des Nitrid-Abstandsstücks eine Vergrößerung des „Vogelschnabels" hervorrufen kann.ever bigger though the width of the nitride spacer is, the closer the area to be oxidized. The usage of the nitride spacer as described above impaired therefore the insulating effect. On the other hand, there is the OSELO method the problem that a very small width of the nitride spacer a Enlargement of the "bird's beak" can cause.
Die US 4,764,248 offenbart zur Herstellung einer Feldoxidschicht ein Verfahren, bei dem ein Oxidfilm auf einem Siliziumsubstrat in einer Ammoniakatmosphäre mit einem Rapid-thermal-nitridization-Verfahren nitridisiert wird. Auch eine Nitridisierung in drei Stunden bei 1000° Celsius wird offenbart. Hier wird jedoch die schnelle Behandlung als vorteilhaft dargestellt.The US 4,764,248 discloses for producing a field oxide layer Method in which an oxide film on a silicon substrate in a ammonia atmosphere nitrided with a rapid thermal nitridization process. Also a nitridation in three hours at 1000 ° Celsius is revealed. Here, however, the fast treatment is shown to be advantageous.
Die
Die
Die Aufgabe der vorliegenden Erfindung besteht in der Bereitstellung eines Verfahrens, welches mit wenig Verfahrensschritten eine gut kontrollierbare Ätzung einer Nitridschicht bei der Herstellung einer Feldoxidschicht ermöglicht.The Object of the present invention is to provide a process which is a good one with few process steps controllable etching a nitride layer in the production of a field oxide layer allows.
Gemäß der vorliegenden Erfindung wird ein Verfahren zur Herstellung einer Feldoxidschicht in einer Halbleitervorrichtung zur Verfügung gestellt, welches die Schritte von Anspruch 1 umfasst.According to the present The invention will be a method for producing a field oxide layer in a semiconductor device provided with the Steps of claim 1.
Weitere Zielrichtungen, Aspekte und Vorteile der Erfindung werden aus der nachstehenden Beschreibung bevorzugter Ausführungsformen unter Bezugnahme auf die beigefügten Zeichnungen deutlich. Es zeigt:Further Aspects, aspects and advantages of the invention will be apparent from the below description of preferred embodiments with reference on the attached Drawings clearly. It shows:
Nachstehend
wird die vorliegende Erfindung im Einzelnen unter Bezugnahme auf
die
Zuerst
wird, wie in
Daraufhin
wird, wie in
Wie
aus
Das
freiliegende Siliziumsubstrat wird durch den thermischen Oxidationsvorgang
bei hoher Temperatur oxidiert, und es wird eine Feldoxidschicht
Schließlich wird
gemäß
Wie aus der voranstehenden Beschreibung deutlich wird, ist die vorliegende Erfindung in der Hinsicht wirksam, dass sie den aktiven Bereich vergrößert, indem sie verhindert, dass der „Vogelschnabel" in der Grenzfläche zwischen dem Siliziumsubstrat und der Anschlussflächen-Oxidschicht erzeugt wird. Weiterhin kann die vorliegende Erfindung eine dicke Feldoxidschicht erzeugen, die eine hervorragende Isolationswirkung aufweist, da eine dünne Nitridschicht verwendet werden kann.As From the above description, is the present Invention effective in the sense that it is the active area enlarged by she prevents the "bird's beak" in the interface between the silicon substrate and the pad oxide film is formed. Farther For example, the present invention can produce a thick field oxide layer. which has an excellent insulating effect, since a thin nitride layer can be used.
Daher kann die vorliegende Erfindung bei verschiedenen LOCOS-Verfahren eingesetzt werden.Therefore The present invention can be applied to various LOCOS methods be used.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR95-17885 | 1995-06-28 | ||
KR1019950017885A KR100190363B1 (en) | 1995-06-28 | 1995-06-28 | Forming element isolation region in semiconductor device |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19625404A1 DE19625404A1 (en) | 1997-01-02 |
DE19625404B4 true DE19625404B4 (en) | 2005-12-29 |
Family
ID=19418567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19625404A Expired - Fee Related DE19625404B4 (en) | 1995-06-28 | 1996-06-25 | Method for producing a field oxide layer in a semiconductor device |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPH0917780A (en) |
KR (1) | KR100190363B1 (en) |
CN (1) | CN1075666C (en) |
DE (1) | DE19625404B4 (en) |
GB (1) | GB2302758A (en) |
TW (1) | TW297944B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19731203A1 (en) * | 1997-07-21 | 1999-02-11 | Siemens Ag | CMOS circuit and method for its manufacture |
KR100439107B1 (en) * | 1997-12-29 | 2004-07-16 | 주식회사 하이닉스반도체 | Method for forming isolation layer of semiconductor device to prevent leakage current |
CN104299984A (en) * | 2013-07-19 | 2015-01-21 | 北大方正集团有限公司 | Semiconductor device and manufacture method thereof |
KR20160000007U (en) | 2014-06-24 | 2016-01-04 | 안숙희 | Bottom block of hydraulic vice |
CN105390409B (en) * | 2014-09-04 | 2018-06-26 | 北大方正集团有限公司 | The test method and device of beak length |
KR20190131343A (en) | 2018-05-16 | 2019-11-26 | 현대중공업 주식회사 | Ship |
CN113838797B (en) * | 2021-11-26 | 2022-03-04 | 广州粤芯半导体技术有限公司 | Preparation method of local oxide layer and preparation method of semiconductor device |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0075875A2 (en) * | 1981-09-28 | 1983-04-06 | General Electric Company | Method of making integrated circuits comprising dielectric isolation regions |
JPS61174737A (en) * | 1985-01-30 | 1986-08-06 | Oki Electric Ind Co Ltd | Manufacture of semiconductor element |
US4764248A (en) * | 1987-04-13 | 1988-08-16 | Cypress Semiconductor Corporation | Rapid thermal nitridized oxide locos process |
GB2238658A (en) * | 1989-11-23 | 1991-06-05 | Stc Plc | Integrated circuits |
US5382533A (en) * | 1993-06-18 | 1995-01-17 | Micron Semiconductor, Inc. | Method of manufacturing small geometry MOS field-effect transistors having improved barrier layer to hot electron injection |
JPH0730113A (en) * | 1993-07-09 | 1995-01-31 | Sony Corp | Manufacture of mos transistor |
US5399520A (en) * | 1993-03-31 | 1995-03-21 | Hyundai Electronics Industries Co., Ltd. | Method for the formation of field oxide film in semiconductor device |
DE4422957A1 (en) * | 1993-10-25 | 1995-04-27 | Samsung Electronics Co Ltd | Insulation method for a semiconductor device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5256895A (en) * | 1987-02-24 | 1993-10-26 | Sgs-Thomson Microelectronics, Inc. | Pad oxide protect sealed interface isolation |
US5298451A (en) * | 1991-04-30 | 1994-03-29 | Texas Instruments Incorporated | Recessed and sidewall-sealed poly-buffered LOCOS isolation methods |
-
1995
- 1995-06-28 KR KR1019950017885A patent/KR100190363B1/en not_active IP Right Cessation
-
1996
- 1996-05-16 TW TW085105772A patent/TW297944B/zh active
- 1996-06-10 JP JP8147483A patent/JPH0917780A/en active Pending
- 1996-06-12 GB GB9612263A patent/GB2302758A/en not_active Withdrawn
- 1996-06-25 DE DE19625404A patent/DE19625404B4/en not_active Expired - Fee Related
- 1996-06-27 CN CN96110232A patent/CN1075666C/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0075875A2 (en) * | 1981-09-28 | 1983-04-06 | General Electric Company | Method of making integrated circuits comprising dielectric isolation regions |
JPS61174737A (en) * | 1985-01-30 | 1986-08-06 | Oki Electric Ind Co Ltd | Manufacture of semiconductor element |
US4764248A (en) * | 1987-04-13 | 1988-08-16 | Cypress Semiconductor Corporation | Rapid thermal nitridized oxide locos process |
GB2238658A (en) * | 1989-11-23 | 1991-06-05 | Stc Plc | Integrated circuits |
US5399520A (en) * | 1993-03-31 | 1995-03-21 | Hyundai Electronics Industries Co., Ltd. | Method for the formation of field oxide film in semiconductor device |
US5382533A (en) * | 1993-06-18 | 1995-01-17 | Micron Semiconductor, Inc. | Method of manufacturing small geometry MOS field-effect transistors having improved barrier layer to hot electron injection |
JPH0730113A (en) * | 1993-07-09 | 1995-01-31 | Sony Corp | Manufacture of mos transistor |
DE4422957A1 (en) * | 1993-10-25 | 1995-04-27 | Samsung Electronics Co Ltd | Insulation method for a semiconductor device |
Non-Patent Citations (1)
Title |
---|
CHI-HUNG HUI,J., et al.: Sealed-Interface Local Oxidation Technology. In: IEEE Trans. on Electron Devices, Vol. ED-29, No. 4, April 1982, S. 554-561 * |
Also Published As
Publication number | Publication date |
---|---|
KR100190363B1 (en) | 1999-06-01 |
GB9612263D0 (en) | 1996-08-14 |
KR970003811A (en) | 1997-01-29 |
DE19625404A1 (en) | 1997-01-02 |
GB2302758A (en) | 1997-01-29 |
TW297944B (en) | 1997-02-11 |
CN1075666C (en) | 2001-11-28 |
JPH0917780A (en) | 1997-01-17 |
CN1145532A (en) | 1997-03-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3901114C2 (en) | Method of manufacturing a gate electrode | |
DE3219441C2 (en) | ||
DE4422957B4 (en) | Insulating method for a semiconductor device | |
DE2832740C2 (en) | Method for manufacturing a semiconductor device with multilevel wiring | |
DE4109184C2 (en) | Method for forming a field oxide layer of a semiconductor device | |
DE4323964A1 (en) | Treating semiconductor substrate in gas atmos. - to suppress formation of bulk micro defects | |
DE2615754C2 (en) | ||
DE3524274A1 (en) | METHOD FOR SEPARATING SEMICONDUCTOR COMPONENTS ON A SILICON SUBSTRATE | |
DE19836164A1 (en) | Integrated circuit trench isolation includes an oxidation resistant nitride layer | |
DE102006060800B4 (en) | Method for forming a trench | |
DE19625404B4 (en) | Method for producing a field oxide layer in a semiconductor device | |
DE2617293C3 (en) | Method for manufacturing a semiconductor component | |
DE19840385C2 (en) | Method for isolating areas of an integrated circuit and semiconductor device with an integrated circuit | |
DE19606682A1 (en) | Semiconductor device with LOCOS element insulating film | |
DE2703618C2 (en) | Process for the production of a semiconductor integrated circuit | |
EP1344245B1 (en) | Method for producing a solid body comprising a microstructure | |
DE4443593C2 (en) | Semiconductor device and method for its production | |
DE19834420A1 (en) | Semiconductor device with isolated gate | |
DE19823742A1 (en) | Method of forming an isolation region in a semiconductor device and resulting structure | |
DE19524202C2 (en) | Method of forming a field oxide film for a semiconductor device | |
DE3832450A1 (en) | Method for forming field-oxide regions in a silicon substrate | |
DE10337061A1 (en) | Semiconductor package and manufacturing method therefor | |
DE2316118A1 (en) | METHOD FOR MANUFACTURING FIELD EFFECT TRANSISTORS BY THE APPLICATION OF SELECTIVE EATERING | |
DE1927645A1 (en) | Method of manufacturing a semiconductor element | |
DE1614358A1 (en) | Process for the etching treatment of semiconductor bodies |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |