We introduce a general relationship between the effective diffusion length LQ of solar cells derived from spectral quantum efficiency Q and the effective diffusion length LJ that determines the saturation current j0=qn0D/LJ of the diode in the dark. The general relation LQ⩾LJ holds in the presence of grain boundaries and of spatially nonhomogeneous doping profiles. We find the relation LQ=LJ for solar cells without potential fluctuations at the collecting junction.
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Brendel et al. (1999) studied this question.
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