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US4814286A Expired / Lapsed US ⏱️ 0.0 years remaining

EEPROM cell with integral select transistor

Assignee: Intel Corp
•
Filing: 1988-05-09
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Granted: 1989-03-21
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Expires: 2008-05-09
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Abstract

Abstract An electrically programmable and electrically erasable floating gate memory device which includes an integrally formed select device. In the n-channel embodiment, a boron region is formed adjacent to the drain region under the control gate and extends slightly under the folating gate. This region is formed using a spacer defined with an anisotropic etching step. The region, in addition to providing enhanced programming, prevents conduction when over-erasing has occurred, that is, when the erasing causes the cell to be depletion-like.

Inventors

  • 👤 Simon M. Tam

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 04:18
CPC Classifications
H; H10; H10D; H10D30/00; H10D30/01; H10D30/021; H10D30/0411; H10D30/60; H10D30/68; H10D30/681; H10D30/684; H10D30/685; H10D64/00; H10D64/01; H10D64/031; H10D64/035

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 229 words
A process for forming an electrically programmable and electrically erasable memory cell in a silicon body comprising the steps of: forming a first insulative layer on said body; defining at least a first edge of a first polysilicon gate member from a first polysilicon layer formed on said first insulative layer; depositing a second insulative layer so as to cover said exposed portions of said first insulative layer and said first gate member; etching said second insulative layer so as to define a spacer member adjacent to said first edge of said first gate member; doping said silicon body with a first doping step with a dopant of a first conductivity type, said spacer member protecting a first region in said body under said spacer member from receiving said dopant; removing said spacer member; doping main body with a second doping step with a dopant of a second conductivity type so as to dope said first region with said dopant of said second conductivity type; forming a second polysilicon layer over said first gate member and insulated therefrom and defining a second gate member from said second layer, said second layer member extending over said first region; forming source and drain regions in said body with a third doping step in alignment with said second gate member; whereby a memory cell having an integrally formed select device is realized.
Claim 2
Dependent Claim 229 words
A process for forming an electrically programmable and electrically erasable memory cell in a silicon body comprising the steps of: forming a first insulative layer on said body; defining at least a first edge of a first polysilicon gate member from a first polysilicon layer formed on said first insulative layer; depositing a second insulative layer so as to cover said exposed portions of said first insulative layer and said first gate member; etching said second insulative layer so as to define a spacer member adjacent to said first edge of said first gate member; doping said silicon body with a first doping step with a dopant of a first conductivity type, said spacer member protecting a first region in said body under said spacer member from receiving said dopant; removing said spacer member; doping main body with a second doping step with a dopant of a second conductivity type so as to dope said first region with said dopant of said second conductivity type; forming a second polysilicon layer over said first gate member and insulated therefrom and defining a second gate member from said second layer, said second layer member extending over said first region; forming source and drain regions in said body with a third doping step in alignment with said second gate member; whereby a memory cell having an integrally formed select device is realized.
Claim 3
Dependent Claim 38 words
The process defined by claim 1 including the additional steps of covering said drain region and additionally doping said source region so as to form a deeper source region when compared to the depth of said drain region.
Claim 4
Dependent Claim 29 words
The process defined by claim 1 or claim 2 wherein said first conductivity type dopant is an n-type dopant and said second conductivity type dopant is a p-type dopant.
Claim 5
Dependent Claim 16 words
The process defined by claim 2 when said first doping step comprises the implantation of arsenic.
Claim 6
Dependent Claim 16 words
The process defined by claim 3 wherein said second dopant step comprises the implantation of boron.
Claim 7
Dependent Claim 32 words
The process defined by claim 1 or 2 wherein the second edge of said first gate member and an edge of said second gate member are formed in alignment with one another.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-03-20 1992-09-19 1993-03-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-03-20 1996-09-19 1997-03-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-03-20 2000-09-19 2001-03-21 $7700.00 Window Closed / Lapsed

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