DE2607414C2 - Method for healing crystal lattice damage on silicon crystals doped with phosphorus by irradiation with thermal neutrons - Google Patents
Method for healing crystal lattice damage on silicon crystals doped with phosphorus by irradiation with thermal neutronsInfo
- Publication number
- DE2607414C2 DE2607414C2 DE19762607414 DE2607414A DE2607414C2 DE 2607414 C2 DE2607414 C2 DE 2607414C2 DE 19762607414 DE19762607414 DE 19762607414 DE 2607414 A DE2607414 A DE 2607414A DE 2607414 C2 DE2607414 C2 DE 2607414C2
- Authority
- DE
- Germany
- Prior art keywords
- phosphorus
- silicon crystals
- tempering
- hours
- crystal lattice
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B31/00—Diffusion or doping processes for single crystals or homogeneous polycrystalline material with defined structure; Apparatus therefor
- C30B31/20—Doping by irradiation with electromagnetic waves or by particle radiation
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Ausheilen von Kristallgitterschäden an durch Bestrahlung mit thermischen Neutronen phosphordotierten Siliciumkristallen durch Erhitzen auf über 10000C für mehr als 1 Stunde in einem Diffusionsofen.The present invention relates to a method for healing crystal lattice damage on silicon crystals doped with phosphorus by irradiation with thermal neutrons by heating to over 1000 ° C. for more than 1 hour in a diffusion furnace.
Ein solches Verfahren ist beispielsweise in der DE-OS 36 490 beschrieben worden. Durch die Bestrahlung mit thermischen Neutronen wird das Siliciumkristall entsprechend der GleichungenSuch a method has been described in DE-OS 36 490, for example. Because of the radiation with thermal neutrons the silicon crystal becomes according to the equations
»Si +in — fi Si +;''Si + in - fi Si +;'
Siliciumkristall für beispielsweise 1 bis 2 Stunden auf eine Temperatur von 1250° C gebrachtSilicon crystal for, for example, 1 to 2 hours brought a temperature of 1250 ° C
Es wurde nun festgestellt, daß sich die elektrischen Meßwerte von Halbleiterbauelementen, die aus solchem Silicium hergestellt werden, während der nachfolgenden Diffusionsprozesse noch verändern können.It has now been found that the electrical Measured values of semiconductor components, which from such Silicon can be produced while the subsequent diffusion processes can still change.
Die der vorliegenden Erfindung zugrundeliegende Aufgabe besteht deshalb in einer Verbesserung bzw. Stabilisierung der elektrischen Meßwerte der durch das eingangs genannte Verfahren hergestellten Siliciumkristalle. The object on which the present invention is based is therefore to improve or Stabilization of the electrical measured values of the silicon crystals produced by the method mentioned at the beginning.
Diese Aufgabe wird dadurch gelöst, daß in einer phosphorhaltigen Atmosphäre erhitzt wird, und daß die gebildete Phosphorbelegung anschließend entfernt wird.This object is achieved in that it is heated in a phosphorus-containing atmosphere, and that the formed phosphorus coating is then removed.
Es wird angenommen, daß durch das Tempern in Phosphoratmosphäre ein Gettereffekt auf die im neutronenbestrahlten Silicium vorhandenen Kristallgitterdefekte ausgeübt wird. Dieser Gettereffekt bewirkt offensichtlich, daß nicht nur Verunreinigungen aus dem Gitter ausgegettert werden, sondern auch schwer auszuheilende Kristallbaufehler, wie sie insbesondere auftreten, wenn der Kristall einer hohen Dosis an schnellen Neutronen ausgesetzt worden istIt is assumed that tempering in a phosphorus atmosphere has a gettering effect on those exposed to neutrons Silicon existing crystal lattice defects is exerted. This getter effect obviously causes that not only impurities are removed from the grid, but also that are difficult to heal Crystal defects, such as those that occur in particular when the crystal is subjected to a high dose of rapid Has been exposed to neutrons
Als besonders günstig hat es sich erwiesen, den Temperprozeß bei 12300C für eine Zeitdauer von 8 Stunden durchzuführen.To be particularly favorable, it has been found to perform the annealing process at 1230 0 C for a period of 8 hours.
Der Gettereffekt wird noch verstärkt wenn die Siliciumeinkristalle vor der Wärmebehandlung in der phosphorhaltigen Atmosphäre einem Vortemperprozeß bei mindestens 10000C, vorzugsweise 11000C, rund 4 Stunden lang unterworfen werden.The gettering effect is exacerbated when the silicon single crystal before the heat treatment in the phosphorus containing atmosphere a Vortemperprozeß at least 1000 0 C, preferably 1100 0 C, about 4 hours will be subject to long.
Sehr gute Ergebnisse in bezug auf die Stabilität der elektrischen Parameter der aus dem so behandelten Material gewonnenen Halbleiterbauelemente werden erzielt, wenn die Siliciumkristalle in Scheibenform in einer Dicke von etwa 2 mm getempert werden. Diese Kristallscheiben können dann beispielsweise bei 1150° C für eine Zeitdauer von 1,5 Stunden der Phosphordiffusion unterworfen werden.Very good results with regard to the stability of the electrical parameters of the so treated Semiconductor components obtained from material are obtained when the silicon crystals are in the form of disks in be tempered to a thickness of about 2 mm. These crystal disks can then, for example, at 1150 ° C be subjected to phosphorus diffusion for a period of 1.5 hours.
Die Belegung wird zweckmäßigerweise durch Läppen entfernt. Zweckmäßigerweise wird die Temperung
in einem für Phosphordiffusion verwendeten Diffusionsofen vorgenommen. Vor dem Tempern empfiehlt es
sich, die Oberflächen der Siliciumkristalle in einer Kalilauge-Ätzlösung und nach der Temperung in einer Ätzlösung
bestehend aus einem Gemischflußsäure zu Salpetersäure im Verhältnis 1 :10 zu behandeln.
Beim Tempern sollte das Aufheizen ab 6000C auf die Tempertemperatur und das Wiederabkühlen bis 600° C
mit einer Geschwindigkeit erfolgen, die nicht größer als 3° C/min ist. Dadurch werden einerseits thermische
Schocks vermieden, andererseits haben die sonstigen Verunreinigungen genügend Zeit, um an die Oberfläche
zu diffundieren.The occupancy is expediently removed by lapping. The tempering is expediently carried out in a diffusion furnace used for phosphorus diffusion. Before tempering, it is advisable to treat the surfaces of the silicon crystals in a caustic potash solution and after tempering in an etching solution consisting of a mixture of hydrofluoric acid and nitric acid in a ratio of 1:10.
On annealing, the heating from 600 0 C to the tempering temperature and the re-cooling to 600 ° C at a rate should be that / is not greater than 3 ° C min. This on the one hand avoids thermal shocks, on the other hand the other impurities have enough time to diffuse to the surface.
mit Phosphor dotiert. Zum Ausheilen der durch die Bestrahlung verursachten Kristallgitterschäden wird dasdoped with phosphorus. This is used to heal the crystal lattice damage caused by the irradiation
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762607414 DE2607414C2 (en) | 1976-02-24 | 1976-02-24 | Method for healing crystal lattice damage on silicon crystals doped with phosphorus by irradiation with thermal neutrons |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762607414 DE2607414C2 (en) | 1976-02-24 | 1976-02-24 | Method for healing crystal lattice damage on silicon crystals doped with phosphorus by irradiation with thermal neutrons |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2607414A1 DE2607414A1 (en) | 1977-08-25 |
DE2607414C2 true DE2607414C2 (en) | 1985-12-12 |
Family
ID=5970709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19762607414 Expired DE2607414C2 (en) | 1976-02-24 | 1976-02-24 | Method for healing crystal lattice damage on silicon crystals doped with phosphorus by irradiation with thermal neutrons |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2607414C2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2436490C3 (en) * | 1974-07-29 | 1978-12-07 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Process for phosphorus doping of weakly n-conducting silicon bodies |
-
1976
- 1976-02-24 DE DE19762607414 patent/DE2607414C2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2607414A1 (en) | 1977-08-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |