[특허]Plasma clean method for deposition chamber

[미국특허] Plasma clean method for deposition chamber 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B08B-009/08
출원번호	US-0355601 (2009-01-16)
등록번호	US-8591659 (2013-11-26)
발명자 / 주소	Fang, Zhiyuan Subramonium, Pramod Henri, Jon Fox, Keith
출원인 / 주소	Novellus Systems, Inc.
대리인 / 주소	Weaver Austin Villeneuve & Sampson LLP
인용정보	피인용 횟수 : 71 인용 특허 : 22

초록 ▼

Improved methods and apparatuses for removing residue from the interior surfaces of the deposition reactor are provided. The methods involve increasing availability of cleaning reagent radicals inside the deposition chamber by generating cleaning reagent radicals in a remote plasma generator and then further delivering in-situ plasma energy while the cleaning reagent mixture is introduced into the deposition chamber. Certain embodiments involve a multi-stage process including a stage in which the cleaning reagent mixture is introduced at a high pressure (e.g., about 0.6 Torr or more) and a stage the cleaning reagent mixture is introduced at a low pressure (e.g., about 0.6 Torr or less).

대표청구항 ▼

1. A method of cleaning a residue from interior surfaces of a semiconductor deposition chamber, the method comprising: a first stage comprising: (a) introducing a first set of one or more cleaning reagents into a remote plasma generator, the first set of one or more cleaning reagents comprising a first amount of an oxygen containing compound and a first amount of a fluorine containing compound;(b) generating activated species from the introduced cleaning reagents in the remote plasma generator by delivering a first plasma energy to the cleaning reagents;(c) introducing a cleaning mixture into the deposition chamber, wherein the cleaning mixture comprises the activated species; and(d) exposing the interior surfaces of the deposition chamber to the cleaning mixture while delivering a second plasma energy by applying a power to the deposition chamber to the cleaning mixture for at least one period of time from an in-situ plasma generator;a second stage comprising: (f) introducing a second set of one or more cleaning reagents into the remote plasma generator, the second set of one or more cleaning reagents comprising a second amount of an oxygen containing compound and a second amount of a fluorine containing compound, wherein a ratio of the first amount of the fluorine containing compound to the first amount of the oxygen containing compound is less than a ratio of the second amount of the fluorine containing compound to the second amount of the oxygen containing compound;wherein the deposition chamber pressure during the first stage is greater than the deposition chamber pressure during the second stage, and wherein the applied power in the first stage is less than the applied power during the second stage such that the second plasma energy in the first stage is less than the second energy during the second stage. 2. The method of claim 1, wherein the residue is a carbon containing residue. 3. The method of claim 1, wherein the residue is formed during deposition of an ashable hard mask film. 4. The method of claim 1, where the residue comprises silicon oxide. 5. The method of claim 1, wherein generating the activated species comprises forming radicals. 6. The method of claim 1, wherein the delivering of the second plasma energy generates additional activated species inside the deposition chamber. 7. The method of claim 1, wherein the first stage is performed at a chamber pressure of at least about 0.6 Torr and the second stage performed at a chamber pressure of no more than about 0.6 Torr. 8. The method of claim 7, wherein the first stage is performed prior to the second stage. 9. The method of claim 7, wherein a flow rate of the oxygen containing compound is at least ten times greater than a flow rate of the fluorine containing compound during the first stage and at least three times greater during the second stage. 10. The method of claim 7, wherein the second plasma energy is delivered at between about 1,000 W and 2,000 W during the first stage and at between about 2,000 W and 3,000 W during the second stage. 11. The method of claim 7, wherein an etch rate of a carbon containing residue around or on a pedestal surface kept at about 150 degrees Centigrade is at least 1 micron per minute during the first stage. 12. The method of claim 1, wherein reacting the residue with the cleaning mixture is performed while a pedestal of the deposition chamber is kept at between about 250 degrees Centigrade and 550 degrees Centigrade. 13. The method of claim 1, wherein delivering the second plasma energy to the cleaning reagents comprises re-dissociating recombined molecules to form radicals. 14. The method of claim 1, further comprising a third stage comprising: (h) introducing a third set of one or more cleaning reagents into the remote plasma generator, the third set of one or more cleaning reagents comprising a third amount of a fluorine containing compound and substantially no oxygen containing compound; and(i) repeating operations (b) and (c) using the third set of one or more cleaning reagents. 15. The method of claim 14, wherein the third stage is shorter than the second stage. 16. The method of claim 14, wherein the in-situ plasma generator is turned off during the third stage.

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