Method and apparatus of multiplejunction solar cell structure with high band gap heterojunction middle cell
AssigneeEmcore Corporation
InventorsNavid Faterni, Daniel J. Aiken, Mark A. Stan
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Abstract
A method and a multijunction solar device having a high band gap heterojunction middle solar cell are disclosed. In one embodiment, a triple-junction solar device includes bottom, middle, and top cells. The bottom cell has a germanium (Ge) substrate and a buffer layer, wherein the buffer layer is disposed over the Ge substrate. The middle cell contains a heterojunction structure, which further includes an emitter layer and a base layer that are disposed over the bottom cell. The top cell contains an emitter layer and a base layer disposed over the middle cell.
Claims17
A multijunction solar cell comprising:
- a first cell including a germanium (Ge) substrate;
- a second cell disposed over the first cell having a heterojunction solar cell structure including a first emitter layer of a first conductivity type and a first base layer of a second conductivity type;
- and
- a third cell disposed over the second cell.
A triple-junction solar cell comprising:
- a bottom cell;
- a middle cell having a heterojunction base and emitter disposed over the bottom cell;
- and
- a top cell having a homojunction disposed over the middle cell.
Dependencies are inferred from the claim text.