Abstract
The influence of grain boundary recombination velocity and grain size on spectral response and white light photocurrent was calculated on the basis of an idealized two-dimensional model describing solar cells made from polycrystalline silicon material with predominantly columnar orientation. The problem of carrier flow within an individual grain was analysed by solving the diffusion equation using boundary conditions. The grain boundaries were considered as recombination planes characterized by a grain boundary recombination velocity which was assumed not to depend on excitation. The differential equations were solved explicitly. The results indicated a blue shift in the spectral response for increasing grain boundary recombination and decreasing grain size which was verified by measurements.
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