US3990101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar cell device having two heterojunctions
Assignee: RCA Corp
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Filing: 1975-10-20
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Granted: 1976-11-02
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Expires: 1995-10-20
Abstract
Abstract A body of semiconductor material of a solar cell device has a surface a portion of which is exposed to incident solar radiation, and a surface opposite the incident surface. At the incident surface and in the body is a first region having a bandgap energy greater than 2.1 eV and thus is substantially transparent to solar radiation. Spaced from the first region and at the opposite surface is a second region which is of a material having a bandgap energy in the range of 1.5 eV to 1.9 eV. Between and in contact with both first and second regions is a third region of a material having a bandgap energy less than either the first or second regions. The third region is the most active region of the device, and the second region is substantially transparent to solar radiation not absorbed by the third region. The junction between the third region and each of the first and second regions are heterojunctions. On the opposite surface of the body is an electrode capable of reflecting back into the body of the device solar radiation passing through the second region which was not absorbed by the active region.
Inventors
- 👤 Michael Ettenberg
- 👤 Henry Kressel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:25
CPC Classifications
H; H10; H10F; H10F10/00; H10F10/10; H10F10/16; H10F10/161; H10F77/00; H10F77/20; H10F77/206; H10F77/211; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y10; Y10S; Y10S148/00; Y10S148/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A solar cell device comprising: a body of semiconductor material having an incident surface a portion of which is exposed so as to allow solar radiation to enter said body, a surface opposite said incident surface, a first region of one conductivity type at said incident surface, a second region of an opposite conductivity type spaced from said first region, a third region between and contiguous to each of said first and second regions, said third region forming a P-N junction in said body, a solar radiation reflecting electrode on said opposite surface, said third region being of a material of substantially uniform composition and of a lower bandgap energy than either said first or second region so that the junctions between said third region and each of said first and second regions are heterojunctions, said first region being of a material having a bandgap energy greater than 2.1 eV thereby being substantially transparent to solar radiation, and said second region is of a material having a bandgap energy in the range of 1.5 eV to 1.9 eV.
Claim 2
Dependent Claim
178 words
A solar cell device comprising: a body of semiconductor material having an incident surface a portion of which is exposed so as to allow solar radiation to enter said body, a surface opposite said incident surface, a first region of one conductivity type at said incident surface, a second region of an opposite conductivity type spaced from said first region, a third region between and contiguous to each of said first and second regions, said third region forming a P-N junction in said body, a solar radiation reflecting electrode on said opposite surface, said third region being of a material of substantially uniform composition and of a lower bandgap energy than either said first or second region so that the junctions between said third region and each of said first and second regions are heterojunctions, said first region being of a material having a bandgap energy greater than 2.1 eV thereby being substantially transparent to solar radiation, and said second region is of a material having a bandgap energy in the range of 1.5 eV to 1.9 eV.
Claim 3
Dependent Claim
35 words
The solar cell device in accordance with claim 1 wherein said third region is of the same conductivity as the second region and said third region and said first region having said P-N junction therebetween.
Claim 4
Dependent Claim
27 words
The solar cell device in accordance with claim 2 wherein said first region is of N-type conductivity and said second and third regions are of P-type conductivity.
Claim 5
Dependent Claim
28 words
The solar cell device in accordance with claim 1 wherein said third region is of a semiconductor material having a bandgap energy in the range of 1.4 eV.
Claim 6
Dependent Claim
59 words
The solar cell device in accordance with claim 4 wherein said third region is of gallium arsenide, GaAs, said first region is of aluminum gallium arsenide, Al x Ga 1 -x As, where 0.5<x<1 and said second region is of aluminum gallium arsenide, Al y Ga 1 -y As where y is in the range of 0.1 to 0.4.
Claim 7
Dependent Claim
35 words
The solar cell device in accordance with claim 1 wherein said third region is of the same conductivity as the first region, and said third region and said second region having said P-N junction therebetween.
Claim 8
Dependent Claim
27 words
The solar cell device in accordance with claim 6 wherein said first and third region are of P-type conductivity and said second region is of N-type conductivity.
Claim 9
Dependent Claim
48 words
The solar cell device in accordance with claim 1 wherein said radiation reflecting electrode comprises a non-continuous insulating layer on said opposite surface having openings in the form of a grid pattern, and a metallic layer in the openings at said opposite surface and on said insulating layer.
Claim 10
Dependent Claim
23 words
The semiconductor device in accordance with claim 8 further comprising an electrode on said incident surface in the form of a grid pattern.
Claim 11
Dependent Claim
58 words
The solar cell device in accordance with claim 1 wherein said third region comprises a first layer of one conductivity type in contact with a second layer of the opposite conductivity type with said P-N junction therebetween, said first layer is in contact with said first region and said second layer is in contact with said second region.
Claim 12
Dependent Claim
37 words
The solar cell device in accordance with claim 10 wherein said first layer is of the same conductivity type as said first region and said second layer is of the same conductivity type as said second region.
References Cited (Backward Citations)
US3862859A
Cited
US3852797A
Cited
US3790868A
Cited
US3814993A
Cited
US3855607A
Cited
US3902133A
Cited
US3881113A
Cited
US3938172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |