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A geometrical model based on the stochastic nature of diffusion transport is proposed to formulate local collection efficiency in the nano-crystalline solar cells. It is shown that this parameter is given by ηlocal(x)≈1−x/L. Using this formula, we derived the generalized form of the well-known equation of total collection efficiency (ηcoll=1−τIMPS/τIMVS), which can be used for all solar cells independent...
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