Solar Cells: Basics
Basis of space solar cells. Amorphous silicon. 1.75. 710. E g ≈ 1.7–1.85 eV. Non-direct. One can thus intuitively understand that to maximize the spectral conversion efficiency, one must choose an intermediate value for the bandgap, corresponding approximately to the bandgaps of crystalline silicon (1.12 eV) or of GaAs (1.43 eV).