US6153538A
Expired / Lapsed
US
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Method of making MOSFET with ultra-thin gate oxide
Assignee: Advanced Micro Devices Inc
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Filing: 1999-05-03
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Granted: 2000-11-28
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Expires: 2019-05-03
Abstract
Abstract A semiconductor device comprising a miniaturized transistor with high-speed performance is formed with an ultra thin gate oxide layer. The ultra thin gate oxide layer is formed retarding its growth on a nitrogen-rich silicon substrate. Embodiments include ion implanting impurity to displace nitrogen atoms from a nitride layer on the substrate and to force the displaced nitrogen atoms into the surface portion of the semiconductor substrate. The nitrogen atoms retard the growth of the gate oxide layer, thereby enabling formation of an ultra thin gate oxide.
Inventors
- 👤 Judy X. An
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:56
CPC Classifications
H; H10; H10P; H10P30/00; H10P30/20; H10P30/225; H10D; H10D64/00; H10D64/01; H10D64/013; H10D64/01302; H10D64/01332; H10D64/01336; H10D64/01344; H10D64/01348; H10D64/60; H10D64/66; H10D64/68; H10D64/693; H10P14/00; H10P14/60; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6322; H10P14/69; H10P14/692; H10P14/6921; H10P14/6922; H10P14/6927; H10P30/202; H10P30/204; H10P30/208; H10P30/214; H10D30/00; H10D30/01; H10D30/021; H10D30/0223; H10D30/0227
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A method of manufacturing a semiconductor device, the method comprising: forming a nitride layer on a main surface of a semiconductor substrate or a well region formed in the semiconductor substrate; ion implanting atoms into a portion of the nitride layer to displace nitrogen atoms from the nitride layer into a portion of the underlying main surface; removing the nitride layer; and thermally oxidizing to form a gate oxide layer on the nitrogen containing main surface portion, wherein the nitrogen atoms in the main surface portion retard the growth of the gate oxide layer thereon.
Claim 2
Independent Claim
95 words
A method of manufacturing a semiconductor device, the method comprising: forming a nitride layer on a main surface of a semiconductor substrate or a well region formed in the semiconductor substrate; ion implanting atoms into a portion of the nitride layer to displace nitrogen atoms from the nitride layer into a portion of the underlying main surface; removing the nitride layer; and thermally oxidizing to form a gate oxide layer on the nitrogen containing main surface portion, wherein the nitrogen atoms in the main surface portion retard the growth of the gate oxide layer thereon.
Claim 3
Dependent Claim
30 words
The method according to claim 1, wherein the nitride layer comprises silicon nitride, the method comprising ion implanting boron difluride (BF 2 ) or arsenic to displace the nitrogen atoms.
Claim 4
Dependent Claim
23 words
The method according to claim 2, comprising forming the silicon nitride layer at a thickness of about 100 Å to about 200 Å.
Claim 5
Dependent Claim
41 words
The method according to claim 2, comprising ion implanting BF 2 at an implantation dosage of about 1×10 12 atoms cm -2 to about 1×10 13 atoms cm -2 at an implantation energy of about 20 KeV to about 35 KeV.
Claim 6
Dependent Claim
33 words
The method according to claim 1, comprising: forming a mask on and exposing a portion of the nitride layer; and ion implanting the atoms into the exposed surface portion of the nitride layer.
Claim 7
Dependent Claim
23 words
The method according to claim 1, comprising forming the gate oxide layer at a thickness of about 10 Å to about 30 Å.
Claim 8
Dependent Claim
33 words
The method according to claim 1, comprising thermally oxidizing at a temperature of about 800° C. to about 1000° C. for about 3 minutes to 10 minutes to form the gate oxide layer.
Claim 9
Dependent Claim
18 words
The method according to claim 1, further comprising forming a gate electrode layer on the gate oxide layer.
Claim 10
Dependent Claim
16 words
The method according to claim 8, further comprising ion implanting to form source and drain regions.
Claim 11
Dependent Claim
64 words
The method according to claim 9, comprising: ion implanting impurities using the gate electrode and gate oxide as a mask, to form shallow source and drain extensions; forming sidewall spacers on side surfaces of the gate electrode and the gate oxide layer; and ion implanting impurities, using the gate electrode, gate oxide and sidewall spacers as a mask, to form source and drain regions.
Claim 12
Dependent Claim
26 words
The method according to claim 9, comprising implanting impurities, using the gate electrode and gate oxide as a make, to form the source and drain regions.
References Cited (Backward Citations)
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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) | 2003-11-28 | 2004-05-29 | 2004-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-28 | 2008-05-29 | 2008-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-28 | 2012-05-29 | 2012-11-28 | $7700.00 | Window Closed / Lapsed |