DE2154234A1 - Purifying semiconductor surfaces - from electrically active (metallic) impurities,using chelating agent to prevent damage - Google Patents
Purifying semiconductor surfaces - from electrically active (metallic) impurities,using chelating agent to prevent damageInfo
- Publication number
- DE2154234A1 DE2154234A1 DE19712154234 DE2154234A DE2154234A1 DE 2154234 A1 DE2154234 A1 DE 2154234A1 DE 19712154234 DE19712154234 DE 19712154234 DE 2154234 A DE2154234 A DE 2154234A DE 2154234 A1 DE2154234 A1 DE 2154234A1
- Authority
- DE
- Germany
- Prior art keywords
- chelating agent
- semiconductor
- water
- impurities
- semiconductor devices
- 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
- 239000004065 semiconductor Substances 0.000 title claims abstract description 31
- 239000002738 chelating agent Substances 0.000 title claims abstract description 13
- 239000012535 impurity Substances 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- QDHGQJQZPJPKJK-UHFFFAOYSA-N 2-[carboxymethyl-(2,4,6-trioxo-1,3-diazinan-5-yl)amino]acetic acid Chemical class OC(=O)CN(CC(O)=O)C1C(=O)NC(=O)NC1=O QDHGQJQZPJPKJK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000002253 acid Substances 0.000 claims abstract description 3
- 150000007513 acids Chemical class 0.000 claims abstract description 3
- 239000013522 chelant Substances 0.000 claims abstract description 3
- BDDLHHRCDSJVKV-UHFFFAOYSA-N 7028-40-2 Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O BDDLHHRCDSJVKV-UHFFFAOYSA-N 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical class [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 claims description 2
- IENXJNLJEDMNTE-UHFFFAOYSA-N acetic acid;ethane-1,2-diamine Chemical compound CC(O)=O.NCCN IENXJNLJEDMNTE-UHFFFAOYSA-N 0.000 claims 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical class OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001465 metallisation Methods 0.000 abstract description 2
- 239000008237 rinsing water Substances 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 235000012431 wafers Nutrition 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 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
- H01L21/3105—After-treatment
-
- 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
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)
- Cleaning Or Drying Semiconductors (AREA)
Abstract
Description
Verfahren zum Entfernen von elektrisch aktiven Verunreinigungen" Die Erfindung betrifft ein Reinigungsverfahren fir Halbleiteranordnungen, die nach dem Planarprinzip aufgebaut sind und an der Halbleiteroberfläche mit einer Isolierschicht versehen sind. Solche Halbleiteranordnungen enthalten pn- Übergänge, die sich meist zu einer Oberflächenseite erstrecken und dort mit einer Oxydschicht passiviert sind. Auf der Oxydschicht verlaufen matallische Leitbahnen, die durch Öffnungen in der Oxydschicht mit den zungeordneten Haibteiterzonen in elektrischer Verbindung stehen.Method of Removing Electrically Active Contaminants "Die The invention relates to a cleaning method fir semiconductor devices that are after Planar principle are built up and on the semiconductor surface with an insulating layer are provided. Such semiconductor arrangements contain pn junctions, which are mostly extend to one surface side and are passivated there with an oxide layer. Metallic interconnects run on the oxide layer through openings in the Oxide layer are in electrical connection with the unordered half-conductor zones.
Derartige Halbleiteranordnungen werden vielfach nach der Kontaktierung und nach dem Aufbringen der metallischen Leitbahnen noch einem Reinigungsprozess unterworfen, durch den besonders Metallionen von der Oberfläche entfernt werden sollen. Metallionen verursachen an der Halb-Leiteroberfläche Inversionsschichten, Eis hors @pemmströme oder gar den Kurzschluß zwischen ben. chbarten HaIlieitsrzonen bedingen. Bisher wurde versucht ; die Halblsiterscheiben in gepufferter oder verdünnter Flußsäure kurz zu überätzen. Bei diesem Verfchren be@tch @sdoch dis Gefahr, daß die an der Oberflöens verdaureoder @et@llisierungen angegriffen oder unteratzt werdan.Such semiconductor arrangements are often after the contact and after applying the metallic Conductors still undergo a cleaning process subjected, through which metal ions in particular are removed from the surface should. Metal ions cause inversion layers on the semi-conductor surface, Ice hors @ pemmströme or even the short circuit between ben. identified halide zones condition. So far has been tried; the half-siter discs in buffered or diluted Briefly overetch hydrofluoric acid. With this procedure, there is a risk that which are attacked or undercut at the surface digestion or et @ llization.
Um diese Nachteile zu vermeia @, wird ein Verfahren zum Entfernen von elsktrisch aktiven V@ru@rsindgungen, insbesondere Metallionen, an der Oberfläche @@@ mit e@ner passivierenden isolierschicht bedeckten Halbleiteranordnungen vorgeschlagen, bei dem erfindungsgemäß vorgesehen ist, daß die Halbleiteranordnungen eine Lösung eingehracht werden, die mit den Verunreinigungen Chelatkomplexe bildet, Bei diesem Verfahren wird das Material der Beschädigung nicht angegriffen, Ebenso ist eine Isolierschicht der Metallisierungen mit Sicherheit angeschlossen, Daher eignet sich das erfindungsgemäße Verfahren besonders für Halbleiteranordnungen, bei denen auf der Isolierschicht zu den ilaibleiterzonen füllende Leitbahnen angeordnet sind. Die Isolierschicht besteht vorzugsweise aus einem Oxyd bei Silizium Halbleiterkörpern beispielsweise aus Siliziumdioxyd.To avoid these disadvantages, a method of removal is provided of electrically active V @ ru @ rsindgungen, especially metal ions, on the surface @@@ with a passivating insulating layer covered semiconductor arrangements proposed, in which it is provided according to the invention that the semiconductor arrangements are a solution that forms chelate complexes with the impurities Procedure, the material of the damage is not attacked, likewise is one Insulating layer of Metallizations connected with security, The method according to the invention is therefore particularly suitable for semiconductor arrangements, in which interconnects filling the ilaibleiterzone are arranged on the insulating layer are. The insulating layer preferably consists of an oxide in the case of silicon semiconductor bodies for example made of silicon dioxide.
Als Chelatbildner werden vorzugsweise Aminopolycarbonsäuren verwendet, Das erfindungsgemäße Verfahren wurde besonders erfolgreich mit dem Di- Ammoniumsalz der Äthylendiammintet'raessigsäure, mit dem Di- Natriumsalz der Äthylendiammintetraessigsäure und mit Uramildiessigsäure durchgeführt.Aminopolycarboxylic acids are preferably used as chelating agents, The process of the invention has been particularly successful with the di-ammonium salt of ethylenediammine tetraacetic acid, with the disodium salt of ethylenediammine tetraacetic acid and carried out with uramildiacetic acid.
Das erfindungsgemäße Verfahren soll noch anhand eines Ausführungsbeispieles näher erläutert werden.The method according to the invention should also be based on an exemplary embodiment are explained in more detail.
Die fertig aufgebauten und kontaktierten Halbleiterscheiben werden zunächst in organischen Lösungsmitteln1 beispielsweise in Alkohol oder Aceton, und in deionisiertem Wasser gereinigt. Danach werden die Halbleiteranordnungen bzw.The fully assembled and contacted semiconductor wafers are first in organic solvents1 for example in alcohol or acetone, and Purified in deionized water. Then the semiconductor arrangements or
Halbleiterscheiben in das Di- Ammoniumsalz der Athylendiammintetraessigsäure gebracht. Die Äthylendiam mintetraessigsäure wurde mit Ammoniak auf einen pH- Wert 5 eingestellt. Die Lösung mit dem Chelatbildner hat vorzug weise eine Temperatur zwischen 40 und 45 CO In dieser Lösung werden die Halbleiterscheiben mindestens 30 Minuten belassene Danach werden die Halbleiteranordnungen ca. 15 Minuten lang mit deionisiertem Wasser gespült. Während dises Spülprozesses wird die Leitfähigkeit des Spült wasser gemessen. Der Spülvorgang wird dann abgebrochen, wenn die Leitfähigkeit des Wassers auf den Ausgangswert nicht verunreinigten Wassers abgesunken ist.Semiconductor wafers in the di-ammonium salt of Ethylenediammine tetraacetic acid brought. The ethylenediamine tetraacetic acid was adjusted to pH with ammonia 5 set. The solution with the chelating agent preferably has a temperature between 40 and 45 CO In this solution, the semiconductor wafers are at least Then left for 30 minutes, the semiconductor devices are about 15 minutes long rinsed with deionized water. During this rinsing process, the conductivity of the rinsing water measured. The rinsing process is canceled when the conductivity of the water has dropped to the initial value for uncontaminated water.
Mit dem erfindungsgemäßen Verfahren können Halbleiterkörper behandelt werden, in denen Dioden, Transistoren, integrierte Halbleiterschaltungen oder andere Halbleiter bauelemente untergebracht sind, Es hat sich gezeigt, daß die elektrisch wirksamen Verunreinigungen an der Isolierschichtoberfläche mit dem Chelatbildner Chelate bilden, die wasserlöslich sind und somit keinen störenden Einfluß mehr auf die elektrischen Kennwerte der fertigen Halbleiterbauelemente ausüben0Semiconductor bodies can be treated with the method according to the invention in which diodes, transistors, semiconductor integrated circuits or others Semiconductor components are housed, It has been shown that the electrical effective impurities on the surface of the insulating layer with the chelating agent Form chelates that are water-soluble and therefore no longer have a disruptive influence Exercise the electrical characteristics of the finished semiconductor components0
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712154234 DE2154234A1 (en) | 1971-10-30 | 1971-10-30 | Purifying semiconductor surfaces - from electrically active (metallic) impurities,using chelating agent to prevent damage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712154234 DE2154234A1 (en) | 1971-10-30 | 1971-10-30 | Purifying semiconductor surfaces - from electrically active (metallic) impurities,using chelating agent to prevent damage |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2154234A1 true DE2154234A1 (en) | 1973-05-03 |
Family
ID=5823868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19712154234 Pending DE2154234A1 (en) | 1971-10-30 | 1971-10-30 | Purifying semiconductor surfaces - from electrically active (metallic) impurities,using chelating agent to prevent damage |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2154234A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0702399A1 (en) * | 1994-09-14 | 1996-03-20 | Siemens Aktiengesellschaft | Process for wet chemical removal of contaminants from semiconductor crystal surfaces |
EP0909311A1 (en) * | 1997-02-14 | 1999-04-21 | Ekc Technology, Inc. | Post clean treatment |
US6436302B1 (en) | 1999-08-23 | 2002-08-20 | Applied Materials, Inc. | Post CU CMP polishing for reduced defects |
US6546939B1 (en) | 1990-11-05 | 2003-04-15 | Ekc Technology, Inc. | Post clean treatment |
US6572453B1 (en) | 1998-09-29 | 2003-06-03 | Applied Materials, Inc. | Multi-fluid polishing process |
-
1971
- 1971-10-30 DE DE19712154234 patent/DE2154234A1/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6546939B1 (en) | 1990-11-05 | 2003-04-15 | Ekc Technology, Inc. | Post clean treatment |
EP0702399A1 (en) * | 1994-09-14 | 1996-03-20 | Siemens Aktiengesellschaft | Process for wet chemical removal of contaminants from semiconductor crystal surfaces |
EP0909311A1 (en) * | 1997-02-14 | 1999-04-21 | Ekc Technology, Inc. | Post clean treatment |
EP0909311A4 (en) * | 1997-02-14 | 2001-02-28 | Ekc Technology Inc | Post clean treatment |
US6572453B1 (en) | 1998-09-29 | 2003-06-03 | Applied Materials, Inc. | Multi-fluid polishing process |
US6436302B1 (en) | 1999-08-23 | 2002-08-20 | Applied Materials, Inc. | Post CU CMP polishing for reduced defects |
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