Solar cell device having two heterojunctions

Details Solar cell device having two heterojunctions Solar cell device having two heterojunctions

1975-10-20

1976-11-02

Edlow, Martin H.

357 16, 357 18, H01L 2714

Patent

active

039901017

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.

REFERENCES:
patent: 3790868 (1974-02-01), Soshea
patent: 3814993 (1974-06-01), Kennedy
patent: 3852797 (1974-12-01), Lebailly
patent: 3855607 (1974-12-01), Kressel
patent: 3862859 (1975-01-01), Ettenberg
patent: 3881113 (1975-04-01), Rideunt
patent: 3902133 (1975-08-01), Watts
patent: 3938172 (1976-02-01), Lockwood

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