DE1789010A1 - Process for the production of germ-like insulator layers for control electrodes in MOS field effect transistors - Google Patents
Process for the production of germ-like insulator layers for control electrodes in MOS field effect transistorsInfo
- Publication number
- DE1789010A1 DE1789010A1 DE19681789010 DE1789010A DE1789010A1 DE 1789010 A1 DE1789010 A1 DE 1789010A1 DE 19681789010 DE19681789010 DE 19681789010 DE 1789010 A DE1789010 A DE 1789010A DE 1789010 A1 DE1789010 A1 DE 1789010A1
- Authority
- DE
- Germany
- Prior art keywords
- insulator layer
- wedge
- mos field
- layer
- field effect
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 29
- 239000012212 insulator Substances 0.000 title claims description 28
- 230000005669 field effect Effects 0.000 title claims description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000013078 crystal Substances 0.000 claims description 22
- 230000005855 radiation Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 230000000873 masking effect Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 230000010152 pollination Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
- F24H1/30—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle being built up from sections
- F24H1/32—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle being built up from sections with vertical sections arranged side by side
-
- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
Description
Verfahren zum Herstellen keimförmiger Isolatorschichten für Steuerelektroden
bei MOS-Peldeffekttranaistoren
Bei normalen gate-Isolatoren mit konstantem Dibkenprofil nimmt die
channel-Tiefe mit wachsender Entfernung von der source-D-.*Lffusion ab. Sobald der
Spannungsabfall des drain-Stroms einen Wert erreicht hat, der die Wirkung des Feldes
der gate-Elektrode aufhebt, ist der pinch-off-Zustand erreicht und der drain-Strom
sättigt sich unabhängig von der draili-Spannung. Durch eitle Abnahme der gate-Isolatordicke
dagegen vom source- zum drain-Gebiet wird die channel-Leit-
Es liegt im Rahmen der vorliegenden Erfindung, die Kristallscheibe gegenüber der Isolatormaterialquelle so zu orientieren, daß sich ein Einfallswinkel von lo 0 einstellt.It is within the scope of the present invention to orient the crystal disk with respect to the source of insulator material in such a way that an angle of incidence of lo 0 is established.
In einer Weiterbildung des Erfindungsgedankens ist.vorgesehen, als energiereiche Strahlung Ionen- oder Elektronenstrahlung für die Vordampfung des Isolatormaterials zu verwenden. Eine weitere Möglichkeit besteht in der Verwendung von Laserstrahlung.In a further development of the inventive concept, it is provided as high-energy radiation ion or electron radiation for the To use pre-evaporation of the insulator material. There is another possibility in the use of laser radiation.
Durch die Ausnützung der Schattenwirkung der auf der Kristallscheibe befindlichen maskierenden Oxidschichtreste .beim Aufstäuben-dei3'Isolatorma'terials , auf die freien Oberflächenbereiche der Kristallscheibe gelingt es, jedem deÜ etwa looo Systeme einer Kristallscheibe einen Dickenverlauf der Isolatorschicht aufzuprägen, der etwa von 7oo - 12oo 2 konstant ansteigt. Dabei wird die'Möglichkeit der Herstellung eines in sich parallelen Stroms von durch.Zerstäubung erzeugten Teilchen mit einem Querschnitt von einigen cm 2 ausgenutzt. Dieser Effekt läßt-sich noch verbessern, wenn in einer Weiterbildung des-Erfindungsgedankens zur Begrenzung der durch dieenerglereiche Strahlung ausgelösten Teilchenstrahlung eine Blende aus Molybdän verwendet wird.Through the utilization of the shadow effect of the present on the crystal wafer masking Oxidschichtreste .When sputtering-dei3'Isolatorma'terials, to the free surface regions of the crystal wafer, it is possible, deÜ about impart any looo systems of a crystal disc has a thickness profile of the insulator layer, which is about of 7oo - 12oo 2 rises constantly. The possibility of producing a parallel flow of particles produced by atomization with a cross section of a few cm 2 is used. This effect can be further improved if, in a further development of the inventive concept, a diaphragm made of molybdenum is used to limit the particle radiation released by the high-energy radiation.
Als Isolatorschichten können SiO -Schichten oder auch Sili-2 eiumnitridschichten
aufgebracht vierden.
In Fig. 1 ist ein durch das erfindungsgemäße Verfahren hergestelltes System eines 2eldeffekttransistors im Schnittbild dargestellt. Fig. 2 zeigt schematisch eine zur Durchführung des erfindungsgemäßen Verfahrens verwendete Vorrichtung.In Fig. 1 , a system of a 2 field effect transistor produced by the method according to the invention is shown in a sectional view. Fig. 2 shows schematically an apparatus used to carry out the method according to the invention.
In Fig. 1 bedeutet 1 den aus p-leitendem Siliciummaterial bestehenden Gründkristall, in welchem die Gebiete für die Zuleitungselektrode (source) 2 und die Ableitungselektrode (drain) 3 mit n +-Leitfähigkeit durch Diffusion aus der mit Phosphor dotierten SiO 2-Schicht 4 von lp Schichtstärke und einer normalen Diffusion aus der Gasphase erzeugt wurden. Die Figur zeigt nur die nach dem Ausätzen stehengebliebenen Teile dieser Maskierungsschicht. Die zwischen dem source- und drain-Gebiet 2 und 3 freie Oberfläche des Basiskristalls 1 (in der Literatur allgemein als Kanal oder channel bezeichnet) weist eine Ausdehnung von ca.In Fig. 1 , 1 denotes the green crystal consisting of p-conductive silicon material, in which the areas for the supply electrode (source) 2 and the drainage electrode (drain) 3 with n + conductivity by diffusion from the phosphorus-doped SiO 2 layer 4 of 1p layer thickness and normal diffusion from the gas phase. The figure shows only the parts of this masking layer that have remained after the etching. The free surface of the base crystal 1 between the source and drain areas 2 and 3 (generally referred to as channel in the literature) has an area of approx.
8/u auf und wird nach dem erfindungsgemäßen Verfahren mit einer aus SiO 2 bestehenden Isolatorschicht 5 mit keilförmigem Dickenverlauf verseheng wobei die Dicke von dem drain-Gebiet 3 nach dem source-Gebiet 2 von 7oo - 12oo konstant ansteigt. Beim Aufstäuben dieser SIO 2-Schicht 5 wird die Schattenwirkung der stehengebliebenen maskierenden Oxidschichten 4 ausgenutzt, wenn'dabei die Bestäubung der Siliciumkristallscheibe unter einem Einfallswinkel von 5 - loo (dieser Winkel richtet sich nach dem gewünschten Dickenverlauf) vorgenommen wird. Notwendigerweise entstehen auf den Oxidschichtrosten 4 und am Rand der über dem source-Gebiet 2 befindlichen Oxidschicht ebenfalls Ibolatorschichten, die in Fig. 1 mit 6 bezeichnet sind. Im Anschluß an diesen Pertigungssehritt werden dann mittels-- Verfahrenssehritten der Aufdampfung oder mit Elektronenkanone und der Potoätztechnik die Aluminiumkontaktschichten 7 und 8 für das source- und drain-Gebiet sowie die Steuerelektrode 9 (gate) gebildet.8 / u and is verseheng by the inventive method with a group consisting of SiO 2 insulator layer 5 with wedge-shaped thickness profile in which the thickness of the drain region 3 to the source region 2 of 7oo - increases 12oo constant. When sputtering this SiO2 layer 5, the shadow effect of the stalled masking oxide 4 is utilized wenn'dabei pollination of the silicon crystal wafer at an incident angle of 5 - is loo (this angle is determined by the desired thickness profile) made. It is necessary that Ibolatorschichten also arise on the oxide layer gratings 4 and at the edge of the oxide layer located above the source area 2, which layers are designated by 6 in FIG. 1. Subsequent to this production step, the aluminum contact layers 7 and 8 for the source and drain area as well as the control electrode 9 (gate) are then formed by means of process steps of vapor deposition or with an electron gun and the photo etching technique.
Die in Fig. 1 gestrichelt eingezeichnete Kurve 10.Zeigt die sich nach dem erfindungsgemäßen Verfahren ergebende n-channel-Tiefe im pineh-off-Zustand der Anordnung, während die punktiert eingezeichnete Kurve 11 im Vergleich dazu andeuten sollg wiz die n-channel-Tiefe bei den nach bekannten Verfahren erzeuglen Isolatorschichten, die eine konstante Dicke aufweisen, verlaufen würde.The curve 10 drawn in dashed lines in FIG. 1 shows the n-channel depth resulting from the method according to the invention in the pineh-off state of the arrangement, while the dotted curve 11 in comparison is intended to indicate the n-channel depth would run in the insulator layers produced by known methods, which have a constant thickness.
Bei der Darstellung der Figur 1 wird darauf hingewiesen, daß sich die Größenverhältnisse in' senkrechter zu wgagrechter Richtung, um den keilförmigen Verlauf der Isolatorschicht besser abbilden zu können, wie 5:1 verhalten.In the illustration of FIG. 1 , it is pointed out that the size ratios in the perpendicular to horizontal direction, in order to be able to better depict the wedge-shaped profile of the insulator layer, are as 5: 1 .
Fig. 2 zeigt eine schematische Anordnung zur Durchführung des erfindungsgemäßen Verfahrens, in welcher mit dem Bezugszeichen 12 die Quelle dargestellt istt aus de r das Isolationsmaterial, z. B. SiO 2 , beispielsweise durch Beschuß mit Elektronenstrahlen zerstäubt wird. Die auf diese Weise erzeugte Teilchenstrahlung (aus SiO 2 ), in der Figur durch die Pfeile 13 gekennzeichnet, wird zur besseren Begrenzung durch eine Blende 14 aus Molybdän geschickt und trifft so auf die unter einem Einfallswinkel von 5 - 10 0 orientierte, (für die gewünschte Schattenwirkung richtig gedrehte) Siliciumkristallscheibe 15 mit den Maskierungsschichtstrukturen 169 daß sich für jedes auf der Kristallscheibe befindliche System ein keilförmiger Verlauf der Isolatorschichtdicke unter der Steuerelektrode von 7oo.- 12oo vom drain- zum source-Gebiet ansteigend einstellt.Fig. 2 shows a schematic arrangement for carrying out the method according to the invention, in which with the reference numeral 12 the source is shown from de r the insulation material, for. B. SiO 2 , is atomized, for example by bombardment with electron beams. The particle radiation generated in this way (from SiO 2 ), marked in the figure by the arrows 13 , is sent through a diaphragm 14 made of molybdenum for better delimitation and thus hits the one oriented at an angle of incidence of 5-10 ° (for the desired shadow effect correctly rotated) silicon crystal wafer 15 with the masking layer structures 169 that for each system located on the crystal wafer a wedge-shaped course of the insulator layer thickness under the control electrode of 700-1200 increasing from the drain to the source area is established.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681789010 DE1789010A1 (en) | 1968-09-20 | 1968-09-20 | Process for the production of germ-like insulator layers for control electrodes in MOS field effect transistors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681789010 DE1789010A1 (en) | 1968-09-20 | 1968-09-20 | Process for the production of germ-like insulator layers for control electrodes in MOS field effect transistors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1789010A1 true DE1789010A1 (en) | 1972-01-20 |
Family
ID=5706757
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19681789010 Pending DE1789010A1 (en) | 1968-09-20 | 1968-09-20 | Process for the production of germ-like insulator layers for control electrodes in MOS field effect transistors |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1789010A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2445079A1 (en) * | 1974-09-20 | 1976-04-01 | Siemens Ag | FET WITH FLOATING, INSULATED GATE |
DE102014104860B4 (en) | 2013-04-12 | 2023-08-24 | Infineon Technologies Ag | Method of manufacturing a varying thickness insulating layer and a semiconductor device having a varying thickness insulating layer and associated semiconductor device |
-
1968
- 1968-09-20 DE DE19681789010 patent/DE1789010A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2445079A1 (en) * | 1974-09-20 | 1976-04-01 | Siemens Ag | FET WITH FLOATING, INSULATED GATE |
DE102014104860B4 (en) | 2013-04-12 | 2023-08-24 | Infineon Technologies Ag | Method of manufacturing a varying thickness insulating layer and a semiconductor device having a varying thickness insulating layer and associated semiconductor device |
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