Modelling compositional dependence of microcrystalline silicon solar cell parameters

摘要

A two-diode parallel equivalent-circuit electrical model is used to simulate the photovoltaic properties of mixed-phase thin-film silicon solar cells with low-crystalline volume fraction. Reasonable correspondence between experiment and simulation is obtained for short-circuit current and open-circuit voltage vs. volume fraction. However the large dip in fill-factor and reduced PV efficiency measured experimentally in the low-crystalline region is inadequately reproduced. We conclude that poor PV performance in this region is not due solely to shunting by more highly-crystalline filaments, suggesting either that low-crystalline material has transport properties intrinsically inferior to microcrystalline or amorphous silicon, or that the p-i interface is degraded.