| 摘要 |
A solar cell is configured to include a nanostructure called a superlattice. The band gaps of the superlattice are graded so as to provide for broader absorption of incident light energy for conversion into charge carrier pairs. Preferably, the superlattice is formed so that the thickness of the barriers and wells vary along the crystal growth axis of the device. The dimensions of the barriers increase stepwise along the growth axis, whereas the dimensions of the wells decrease stepwise along the growth axis. By varying the relative widths of the barriers and wells, the widths of the minibands in the superlattice are graded. |
