Patent US5457067A successfully refreshed from Google Patents.
US5457067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for formation of an isolating layer for a semiconductor device
Assignee: MagnaChip Semiconductor Ltd
•
Filing: 1994-10-14
•
Granted: 1995-10-10
•
Expires: 2014-10-14
Abstract
Abstract A process for formation of an isolating layer for a semiconductor device is disclosed. During formation of a field isolating layer, a pad oxide layer is formed which is intended to buffer the difference of the thermal expansion rates between the silicon substrate and a nitride layer. First and second side wall spacers are formed, so that the flow of the oxidant into the buffering pad oxide layer should be inhibited, and that the damage-causing shear stress should be reduced. Thus the structural defect having the shape of the bird's beak is prevented, thereby securing a high density element region. Further, during the formation of a monocrystalline silicon, the growth thickness may be optimized, so that the resulting semiconductor device should be flattened, thereby simplifying the process.
Inventors
- 👤 Young-Kyoo Han
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:41
CPC Classifications
H; H10; H10W; H10W10/00; H10W10/01; H10W10/011; H10W10/012; H10W10/0121; H10P; H10P14/00; H10P14/60; H10P14/61; H10W10/10; H10W10/13; H10P50/00; H10P50/69; H10P50/691; H10P95/00; H10P95/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
176 words
A process for forming an isolating layer for a semiconductor device, comprising the steps of: (a) forming a pad oxide layer and a nitride layer on a silicon substrate; (b) removing the pad oxide layer and the nitride layer at an isolating layer region, the pad oxide layer and the nitride layer each having a edge portion at the boundary of the isolating layer region; (c) removing a portion of the silicon substrate to a first thickness in the isolating layer region; (d) forming a first side wall spacer on the edge portion of the pad oxide layer, the first side wall spacer extending to the silicon substrate at the boundary of the isolating layer region; (e) forming a second side wall spacer on the first side wall spacer and on the edge portion of the nitride layer, the second side wall spacer extending to the silicon substrate; (f) forming monocrystalline silicon on the silicon substrate in the isolating layer region; and (g) oxidizing the isolating layer region, wherein the field oxide isolating layer is formed.
Claim 2
Dependent Claim
176 words
A process for forming an isolating layer for a semiconductor device, comprising the steps of: (a) forming a pad oxide layer and a nitride layer on a silicon substrate; (b) removing the pad oxide layer and the nitride layer at an isolating layer region, the pad oxide layer and the nitride layer each having a edge portion at the boundary of the isolating layer region; (c) removing a portion of the silicon substrate to a first thickness in the isolating layer region; (d) forming a first side wall spacer on the edge portion of the pad oxide layer, the first side wall spacer extending to the silicon substrate at the boundary of the isolating layer region; (e) forming a second side wall spacer on the first side wall spacer and on the edge portion of the nitride layer, the second side wall spacer extending to the silicon substrate; (f) forming monocrystalline silicon on the silicon substrate in the isolating layer region; and (g) oxidizing the isolating layer region, wherein the field oxide isolating layer is formed.
Claim 3
Dependent Claim
29 words
The process of claim 1, wherein the field oxide isolating layer is of a second thickness, and wherein the first thickness is about one fourth of the second thickness.
Claim 4
Dependent Claim
13 words
The process of claim 1, wherein the first side wall spacer comprises polysilicon.
Claim 5
Dependent Claim
38 words
The process of claim 3, wherein the thickness of the first side wall spacer is less than the sum of the first thickness plus the thickness of the pad oxide layer plus the thickness of the nitride layer.
Claim 6
Dependent Claim
14 words
The process of claim 1, wherein the first side wall spacer comprises silicon oxide.
Claim 7
Dependent Claim
38 words
The process of claim 5, wherein the thickness of the first side wall spacer is less than the sum of the first thickness plus the thickness of the pad oxide layer plus the thickness of the nitride layer.
Claim 8
Dependent Claim
31 words
The process of claim 1, wherein the thickness of the monocrystalline silicon is controlled such that the surface of the field oxide is substantially planar with the surface of the substrate.
Claim 9
Dependent Claim
186 words
A process for forming an isolating layer for a semiconductor device, comprising the steps of: (a) forming a pad insulating layer and a first oxidant-flow inhibiting layer on a substrate; (b) removing the pad insulating layer and the first oxidant-flow inhibiting layer at an isolating layer region, the pad insulating layer and the first oxidant-flow inhibiting layer each having a edge portion at the boundary of the isolating layer region; (c) removing a portion of the substrate to a first thickness in the isolating layer region; (d) forming a first side wall spacer on the edge portion of the pad insulating layer, the first side wall spacer extending to the substrate at the boundary of the isolating layer region; (e) forming a second side wall spacer comprising a second oxidant-flow inhibiting layer on the first side wall spacer and on the edge portion of the first oxidant-flow inhibiting layer, the second side wall spacer extending to the substrate; (f) forming a monocrystalline layer on the substrate in the isolating layer region; and (g) oxidizing the isolating layer region to form the isolating layer on the substrate.
Claim 10
Dependent Claim
186 words
A process for forming an isolating layer for a semiconductor device, comprising the steps of: (a) forming a pad insulating layer and a first oxidant-flow inhibiting layer on a substrate; (b) removing the pad insulating layer and the first oxidant-flow inhibiting layer at an isolating layer region, the pad insulating layer and the first oxidant-flow inhibiting layer each having a edge portion at the boundary of the isolating layer region; (c) removing a portion of the substrate to a first thickness in the isolating layer region; (d) forming a first side wall spacer on the edge portion of the pad insulating layer, the first side wall spacer extending to the substrate at the boundary of the isolating layer region; (e) forming a second side wall spacer comprising a second oxidant-flow inhibiting layer on the first side wall spacer and on the edge portion of the first oxidant-flow inhibiting layer, the second side wall spacer extending to the substrate; (f) forming a monocrystalline layer on the substrate in the isolating layer region; and (g) oxidizing the isolating layer region to form the isolating layer on the substrate.
Claim 11
Dependent Claim
27 words
The process of claim 8, wherein the isolating layer is of a second thickness, and wherein the first thickness is about one fourth of the second thickness.
Claim 12
Dependent Claim
13 words
The process of claim 8, wherein the first side wall spacer comprises polysilicon.
Claim 13
Dependent Claim
40 words
The process of claim 10, wherein the thickness of the first side wall spacer is less than the sum of the first thickness plus the thickness of the pad insulating layer plus the thickness of the first oxidant-flow inhibiting layer.
Claim 14
Dependent Claim
14 words
The process of claim 8, wherein the first side wall spacer comprises silicon oxide.
Claim 15
Dependent Claim
40 words
The process of claim 12, wherein the thickness of the first side wall spacer is less than the sum of the first thickness plus the thickness of the pad insulating layer plus the thickness of the first oxidant-flow inhibiting layer.
Claim 16
Dependent Claim
31 words
The process of claim 8, wherein the thickness of the monocrystalline layer is controlled such that the surface of the field oxide is substantially planar with the surface of the substrate.
Claim 17
Dependent Claim
29 words
The process of claim 8, wherein the first oxidant-flow inhibiting layer and the second side wall spacer comprise nitride, wherein oxidant flow into the pad insulating layer is inhibited.
Claim 18
Dependent Claim
12 words
The process of claim 8, wherein the pad insulating layer comprises oxide.
Claim 19
Dependent Claim
29 words
The process of claim 8, wherein the pad insulating layer comprises oxide, the substrate comprises silicon, the first oxidant-flow inhibiting layer comprises nitride, and the monocrystalline layer comprises silicon.
Claim 20
Dependent Claim
40 words
The process of claim 17, wherein the thickness of the first side wall spacer is less than the sum of the first thickness plus the thickness of the pad insulating layer plus the thickness of the first oxidant-flow inhibiting layer.
Claim 21
Dependent Claim
32 words
The process of claim 18, wherein the thickness of the monocrystalline silicon layer is controlled such that the surface of the field oxide is substantially planar with the surface of the substrate.
References Cited (Backward Citations)
JPS5835938A
Cited
US4398992A
Cited
JPS60133739A
Cited
JPS63141346A
Cited
JPS63261728A
Cited
JPH01161851A
Cited
JPH02206148A
Cited
JPH02304927A
Cited
US5108946A
Cited
US5248350A
Cited
US5399520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |