Patent US3538973A successfully refreshed from Google Patents.
US6132522A
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Wet processing methods for the manufacture of electronic components using sequential chemical processing
Assignee: SCP SERVICES Inc
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Filing: 1996-07-19
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Granted: 2000-10-17
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Expires: 2016-07-19
Abstract
Abstract The present invention is directed to wet processing methods for the manufacture of electronic component precursors, such as semiconductor wafers used in integrated circuits. More specifically, this invention relates to methods, for example, prediffusion cleaning, stripping, and etching of electronic component precursors using sequential chemical processing techniques.
Inventors
- 👤 Steven Verhaverbeke
- 👤 Christopher F. McConnell
- 👤 Charles F. Trissel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:33
CPC Classifications
H; H10; H10P; H10P52/00; H10P72/00; H10P72/04; H10P72/0402; H10P72/0418; H10P72/0422; H10P72/0426; H10P72/0406; H10P72/0411; H10P72/0416
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
387 words
A method for wet processing semiconductor wafers comprising: a) placing the semiconductor wafers in a liquid displacement reaction chamber; b) providing a volume of a first reactive process liquid to the reaction chamber, wherein the first reactive process liquid comprises at least one first chemical, and wherein the first chemical has a concentration greater than 100 ppm in the first reactive process liquid and is selected from the group consisting of hydrochloric acid and buffers comprising the same, ammonium hydroxide and buffers comprising the same, hydrogen peroxide, sulfuric acid and buffers comprising the same, mixtures of sulfuric acid and ozone, hydrofluoric acid and buffers comprising the same, chromic acid and buffers comprising the same, phosphoric acid and buffers comprising the same, acetic acid and buffers comprising the same, nitric acid and buffers comprising the same, and combinations thereof; c) contacting the surfaces of the semiconductor wafers with the first reactive process liquid for a first selected period of time without removing the semiconductor wafers from the reaction chamber; d) directly displacing the volume of the first reactive process fluid by providing a second reactive process liquid to the reaction chamber, wherein the second reactive process liquid comprises at least one second chemical, wherein the second chemical has a concentration greater than 100 ppm in the second reactive process liquid and is selected from the group consisting of hydrochloric acid and buffers comprising the same, ammonium hydroxide and buffers comprising the same, hydrogen peroxide, sulfuric acid and buffers comprising the same, mixtures of sulfuric acid and ozone, hydrofluoric acid and buffers comprising the same, chromic acid and buffers comprising the same, phosphoric acid and buffers comprising the same, acetic acid and buffers comprising the same, nitric acid and buffers comprising the same, and combinations thereof, and wherein at least one of the chemicals in the first reactive process liquid is absent from the second reactive process liquid; and e) contacting the surfaces of the semiconductor wafers with the second reactive process liquid for a second selected period of time without removing the semiconductor wafers from the reaction chamber, wherein the second reactive process liquid sequentially follows the first reactive process liquid without any intervening contact with a rinsing liquid between the contacting of the semiconductor wafers with the first reactive process liquid and the second reactive process liquid.
Claim 2
Independent Claim
387 words
A method for wet processing semiconductor wafers comprising: a) placing the semiconductor wafers in a liquid displacement reaction chamber; b) providing a volume of a first reactive process liquid to the reaction chamber, wherein the first reactive process liquid comprises at least one first chemical, and wherein the first chemical has a concentration greater than 100 ppm in the first reactive process liquid and is selected from the group consisting of hydrochloric acid and buffers comprising the same, ammonium hydroxide and buffers comprising the same, hydrogen peroxide, sulfuric acid and buffers comprising the same, mixtures of sulfuric acid and ozone, hydrofluoric acid and buffers comprising the same, chromic acid and buffers comprising the same, phosphoric acid and buffers comprising the same, acetic acid and buffers comprising the same, nitric acid and buffers comprising the same, and combinations thereof; c) contacting the surfaces of the semiconductor wafers with the first reactive process liquid for a first selected period of time without removing the semiconductor wafers from the reaction chamber; d) directly displacing the volume of the first reactive process fluid by providing a second reactive process liquid to the reaction chamber, wherein the second reactive process liquid comprises at least one second chemical, wherein the second chemical has a concentration greater than 100 ppm in the second reactive process liquid and is selected from the group consisting of hydrochloric acid and buffers comprising the same, ammonium hydroxide and buffers comprising the same, hydrogen peroxide, sulfuric acid and buffers comprising the same, mixtures of sulfuric acid and ozone, hydrofluoric acid and buffers comprising the same, chromic acid and buffers comprising the same, phosphoric acid and buffers comprising the same, acetic acid and buffers comprising the same, nitric acid and buffers comprising the same, and combinations thereof, and wherein at least one of the chemicals in the first reactive process liquid is absent from the second reactive process liquid; and e) contacting the surfaces of the semiconductor wafers with the second reactive process liquid for a second selected period of time without removing the semiconductor wafers from the reaction chamber, wherein the second reactive process liquid sequentially follows the first reactive process liquid without any intervening contact with a rinsing liquid between the contacting of the semiconductor wafers with the first reactive process liquid and the second reactive process liquid.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the first reactive process liquid does not contain hydrofluoric acid.
Claim 4
Dependent Claim
115 words
The method of claim 2 wherein the first reactive process liquid is an aqueous solution comprising the first chemical selected from the group consisting of hydrochloric acid, ammonium hydroxide, hydrogen peroxide, sulfuric acid, mixtures of sulfuric acid and ozone, mixtures of sulfuric acid and hydrogen peroxide, mixtures of hydrogen peroxide and ammonium hydroxide, and mixtures of hydrogen peroxide and hydrochloric acid; and the second reactive process liquid is an aqueous solution comprising the second chemical selected from the group consisting of hydrochloric acid, ammonium hydroxide, hydrogen peroxide, sulfuric acid, hydrofluoric acid, buffered hydrofluoric acid, mixtures of sulfuric acid and ozone, mixtures of hydrogen peroxide and ammonium hydroxide, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 5
Dependent Claim
65 words
The method of claim 3 wherein the first chemical is selected from the group consisting of mixtures of hydrogen peroxide and ammonium hydroxide, sulfuric acid, mixtures of sulfuric acid and ozone, and mixtures of sulfuric acid and hydrogen peroxide; and the second chemical is selected from the group consisting of hydrochloric acid, hydrofluoric acid, buffered hydrofluoric acid, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 6
Dependent Claim
45 words
The method of claim 4 wherein the first chemical is selected from the group consisting of ammonium hydroxide and hydrogen peroxide; and the second chemical is selected from the group consisting of hydrofluoric acid, buffered hydrofluoric acid, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 7
Dependent Claim
50 words
The method of claim 3 wherein the first chemical is selected from the group consisting of hydrochloric acid, and mixtures of hydrogen peroxide and hydrochloric acid; and the second chemical is selected from the group consisting of hydrofluoric acid, buffered hydrofluoric acid, and mixtures of hydrogen peroxide and ammonium hydroxide.
Claim 8
Dependent Claim
63 words
The method of claim 1 wherein the first reactive process liquid is an aqueous solution comprising the first chemical selected from the group consisting of hydrofluoric acid, buffered hydrofluoric acid and combinations thereof; and the second reactive process liquid is an aqueous solution comprising the second chemical selected from the group consisting of hydrochloric acid, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the reaction chamber is a full flow vessel.
Claim 10
Dependent Claim
27 words
The method of claim 1 further comprising the step of drying the semiconductor wafers in the reaction chamber without removing the semiconductor wafers from the reaction chamber.
Claim 11
Dependent Claim
17 words
The method of claim 1 comprising the step of repeating step d) with additional reactive process liquids.
Claim 12
Dependent Claim
41 words
The method of claim 1 further comprising the step of contacting the semiconductor wafers with a rinsing liquid before contacting the semiconductor wafers with the first reactive process liquid, or after contacting the semiconductor wafers with the second reactive process liquid.
Claim 13
Dependent Claim
323 words
In a method for wet processing semiconductor wafers where semiconductor wafers are placed in a vessel, the vessel is closed to the environment, and the semiconductor wafers are contacted with a series of process liquids by displacing one process liquid with another process liquid, without removing the semiconductor wafers from the vessel, the improvement comprising the steps of: a) filling the vessel with a volume of a first reactive process liquid, wherein the first reactive process liquid comprises a first carrier liquid and at least one first chemical having a concentration greater than 100 ppm in the first reactive process liquid; b) contacting the surfaces of the semiconductor wafers with the first reactive process liquid for a selected period of time, wherein the first chemical in the first reactive process liquid reacts with the surfaces of the semiconductor wafers to remove contaminants bound to the surfaces of the semiconductor wafers, remove photoresist, grow an oxide layer, or etch the surfaces of the semiconductor wafers; c) removing the volume of the first reactive process liquid from the vessel by directly displacing substantially all of the volume of the first reactive process liquid with a second reactive process liquid, wherein the second reactive process liquid comprises a second carrier liquid and at least one second chemical having a concentration of at least 100 ppm in the second reactive process liquid, wherein at least one of the chemicals in the first reactive process liquid is absent from the second reactive process liquid; and d) contacting the surfaces of the semiconductor wafers with the second reactive process liquid for a second selected period of time without removing the semiconductor wafers from the reaction chamber, wherein the second chemical in the second reactive process liquid reacts with the surfaces of the semiconductor wafers to remove contaminants bound up the surfaces of the semiconductor wafers, remove photoresist, grow an oxide layer, or etch the surfaces of the semiconductor wafers.
Claim 14
Dependent Claim
323 words
In a method for wet processing semiconductor wafers where semiconductor wafers are placed in a vessel, the vessel is closed to the environment, and the semiconductor wafers are contacted with a series of process liquids by displacing one process liquid with another process liquid, without removing the semiconductor wafers from the vessel, the improvement comprising the steps of: a) filling the vessel with a volume of a first reactive process liquid, wherein the first reactive process liquid comprises a first carrier liquid and at least one first chemical having a concentration greater than 100 ppm in the first reactive process liquid; b) contacting the surfaces of the semiconductor wafers with the first reactive process liquid for a selected period of time, wherein the first chemical in the first reactive process liquid reacts with the surfaces of the semiconductor wafers to remove contaminants bound to the surfaces of the semiconductor wafers, remove photoresist, grow an oxide layer, or etch the surfaces of the semiconductor wafers; c) removing the volume of the first reactive process liquid from the vessel by directly displacing substantially all of the volume of the first reactive process liquid with a second reactive process liquid, wherein the second reactive process liquid comprises a second carrier liquid and at least one second chemical having a concentration of at least 100 ppm in the second reactive process liquid, wherein at least one of the chemicals in the first reactive process liquid is absent from the second reactive process liquid; and d) contacting the surfaces of the semiconductor wafers with the second reactive process liquid for a second selected period of time without removing the semiconductor wafers from the reaction chamber, wherein the second chemical in the second reactive process liquid reacts with the surfaces of the semiconductor wafers to remove contaminants bound up the surfaces of the semiconductor wafers, remove photoresist, grow an oxide layer, or etch the surfaces of the semiconductor wafers.
Claim 15
Dependent Claim
16 words
The method of claim 12 wherein the first reactive process liquid does not contain hydrofluoric acid.
Claim 16
Dependent Claim
105 words
The method of claim 13 wherein the first and second carrier liquids comprise deionized water, the first chemical is selected from the group consisting of hydrochloric acid, ammonium hydroxide, hydrogen peroxide, sulfuric acid, mixtures of sulfuric acid and ozone, mixtures of sulfuric acid and hydrogen peroxide, mixtures of hydrogen peroxide and ammonium hydroxide, and mixtures of hydrogen peroxide and hydrochloric acid, and the second chemical is selected from the group consisting hydrochloric acid, ammonium hydroxide, hydrogen peroxide, sulfuric acid, hydrofluoric acid, buffered hydrofluoric acid, mixtures of sulfuric acid and ozone, mixtures of hydrogen peroxide and ammonium hydroxide, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 17
Dependent Claim
65 words
The method of claim 14 wherein the first chemical is selected from the group consisting of mixtures of hydrogen peroxide and ammonium hydroxide, sulfuric acid, mixtures of sulfuric acid and ozone, and mixtures of sulfuric acid and hydrogen peroxide, and the second chemical is selected from the group consisting of hydrochloric acid, hydrofluoric acid, buffered hydrofluoric acid, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 18
Dependent Claim
45 words
The method of claim 15 wherein the first chemical is selected from the group consisting of ammonium hydroxide and hydrogen peroxide; and the second chemical is selected from the group consisting of hydrofluoric acid, buffered hydrofluoric acid, and mixtures of hydrogen peroxide and hydrochloric acid.
Claim 19
Dependent Claim
50 words
The method of claim 14 wherein the first chemical is selected from the group consisting of hydrochloric acid, and mixtures of hydrogen peroxide and hydrochloric acid, and the second chemical is selected from the group consisting of hydrofluoric acid, buffered hydrofluoric acid, and mixtures of hydrogen peroxide and ammonium hydroxide.
Claim 20
Dependent Claim
54 words
The method of claim 12 wherein the first and second carrier liquids comprise deionized water, the first chemical is selected from the group consisting of hydrofluoric acid, buffered hydrofluoric acid and combinations thereof, and the second chemical is selected from the group consisting of hydrochloric acid, and mixtures of hydrogen peroxide and hydrochloric acid.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2003-10-17 | 2004-04-17 | 2004-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-17 | 2008-04-17 | 2008-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-17 | 2012-04-17 | 2012-10-17 | $7700.00 | Window Closed / Lapsed |