SOLAR CELL

摘要

A device, system, and method for a multi-junction solar cell is described herein. An exemplary silicon germanium solar cell structure has a substrate with a graded buffer layer grown on the substrate. A base layer and emitter layer for a first solar cell are grown in or on the graded buffer layer. A first junction is provided between the emitter layer and the base layer. A second solar cell is grown on top of the first solar cell.