Photovoltaic device

Details Photovoltaic device Photovoltaic device

1996-08-30

1998-06-23

Nguyen, Nam

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

136249, 257458, H01L 310352

Patent

active

057699631

ABSTRACT:
A photovoltaic device comprises a semiconductor region having at least one set of semiconductor layers comprised of a first semiconductor layer having a first conductivity type, an intrinsic or substantially intrinsic second semiconductor layer, and a third semiconductor layer having a conductivity type opposite to that of the first conductivity type, the layers being formed in this order, and first and second electrodes provided such that the electrodes interpose the semiconductor region; wherein the density of a dopant impurity determining the conductivity type of the first semiconductor layer in a set of semiconductor layers which is in contact with the first electrode is varied so as to be lower on the side of the first electrode, or the grain size of crystals in the first semiconductor layer is varied so as to be smaller on the side of the first electrode. This provides a photovoltaic device that does not exhibit great lowering of characteristics even when short circuits locally occur in the semiconductor layers during long-term service.

REFERENCES:
patent: 4451970 (1984-06-01), Izu et al.
patent: 4598306 (1986-07-01), Nath et al.
patent: 4729970 (1988-03-01), Nath et al.
patent: 5401330 (1995-03-01), Saito et al.

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