Analytical model for the light trapping effect on ZnO:Al/c-Si/SiGe/c-Si solar cells with an optimized design

Abstract

This paper deals with the analytical investigation of light trapping effects on the performance of silicon-germanium (SiGe)-based solar cells in order to optimize both the texture morphology and the antireflection coating (ARC) design parameters. In particular, the model allows to improve the electrical efficiency of ARC/c-Si/SiGe/c-Si heterojunction structures by taking into account also the back surface field (BSF) layer. A multi-objective genetic algorithm (MOGA) has been used as global optimization approach including triangular grating morphology and fundamental device parameters such as the Ge mole fraction, and the doping and thickness of the different device regions.