Patent US5714398A successfully refreshed from Google Patents.
← Back to Patent Explorer
US5714398A Expired / Lapsed US ⏱️ 0.0 years remaining

Self-aligned tungsten strapped source/drain and gate technology for deep submicron CMOS

Assignee: National Science and Technology Council
•
Filing: 1996-07-16
•
Granted: 1998-02-03
•
Expires: 2016-07-16
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The present invention is to develop a proper new process for deep submicron PMOSFET. The characteristic of this process is using Si:Ge:B layer to deposit on the poly-Si film, then go through oxidation or diffusion method to diffuse the boron ion into the poly-Si gate in order to form p-type poly-Si gate. This layer can be etched selectively after spacer etching and reserve a concave gate structure. Thus, it can combine with selective W-CVD to form an excellent p-type poly-Si PMOSFET.

Inventors

  • 👤 Tien Sheng Chao
  • 👤 Horng-Chih Lin

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 23:13
CPC Classifications
H; H10; H10D; H10D30/00; H10D30/01; H10D30/021; H10D30/0215; H10D30/0223; H10D64/00; H10D64/01; H10D64/013; H10D64/01302; H10D64/01304; H10D64/01306; H10D64/01308; H10D64/01312; H10D64/20; H10D64/23; H10D64/251; H10D64/258; H10D64/259; H10D64/60; H10D64/66; H10D64/661; H10D64/662; H10D64/664; H10D84/00; H10D84/01; H10D84/0123; H10D84/0126; H10D84/0165; H10D84/0172; H10D84/0177; H10D84/02; H10D84/03; H10D84/038; H10D64/017

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 168 words
A process for producing a self-aligned tungsten strapped source/drain and gate for a deep submicron CMOS which comprises clearing a wafer, growing a n/p well; making an insulated area using LOCOS; growing a gate oxide, depositing onto the gate oxide poly-Si, processing the wafer through LPCVD to deposit a Si:Ge:B layer using SiH 4 :GeH 4 :B 2 H 6 ; after high temperature annealing, the B in Si:Ge:B layer diffuses into the poly-Si gate to form the p-type poly-Si; subjecting the wafer to poly-Si etching and stacking to SiO 2 or Si 3 N 4 layer to form a spacer after etching; selectively etching the Si:Ge:B layer by a wet etching process; subjecting the wafer to implantation and annealing on the source and drain; then subjecting the wafer to a LPCVD process and filling in with SiH 4 :WF 6 gas to make selective W-CVD; which is followed by depositing BPSG, etching of contact gap, depositing a metal layer and etching in order to finish the device.
Claim 2
Dependent Claim 168 words
A process for producing a self-aligned tungsten strapped source/drain and gate for a deep submicron CMOS which comprises clearing a wafer, growing a n/p well; making an insulated area using LOCOS; growing a gate oxide, depositing onto the gate oxide poly-Si, processing the wafer through LPCVD to deposit a Si:Ge:B layer using SiH 4 :GeH 4 :B 2 H 6 ; after high temperature annealing, the B in Si:Ge:B layer diffuses into the poly-Si gate to form the p-type poly-Si; subjecting the wafer to poly-Si etching and stacking to SiO 2 or Si 3 N 4 layer to form a spacer after etching; selectively etching the Si:Ge:B layer by a wet etching process; subjecting the wafer to implantation and annealing on the source and drain; then subjecting the wafer to a LPCVD process and filling in with SiH 4 :WF 6 gas to make selective W-CVD; which is followed by depositing BPSG, etching of contact gap, depositing a metal layer and etching in order to finish the device.

References Cited (Backward Citations)

US4330931A Cited
JPS61284963A Cited
US5168072A Cited
US5242847A Cited
US5571744A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2001-02-02 2001-08-04 2002-02-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-02-02 2005-08-04 2006-02-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-02-02 2009-08-04 2010-02-03 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag