Solar cells and photodetectors

Details Solar cells and photodetectors Solar cells and photodetectors

H - Electricity

01

L

345/23

H01L 31/04 (2006.01) H01L 31/068 (2006.01) H01L 31/072 (2006.01)

Patent

CA 1222043

-20- Solar Cells and Photodetectors Abstract An improved photovoltaic device in which a charge separation junction 30 is provided over a charge confining heterojunction 32. The charge separation junction 30 is a junction formed of an n+-doped direct bandgap layer 26 on a p-doped direct bandgap active layer 24. The charge confining heterojunction 32 is formed by the interface of the active layer 24 with a Back Surface Layer (BSL) 22 of higher bandgap material than the active layer 24 to provide a Back Surface Field (BSF). The percen- tage of Al in the layers may vary from Y = O to x ? 0.42. The structure applies to both crystalline and amorphous material.

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