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It is well known that the photovoltage in semiconductors, whatever its nature, cannot exceed the energy gap, which is several volts. For instance, in a homogeneous semiconductor the Dember (diffusion) photovoltage does not exceed the following value 3. 6 for an infinitely large intensity of the exciting light: V = kTq n{n₁}{{n₀}} < < kTq n{Nc}{{n₀}} = Eg. (6. 1)
Fridkin et al. (Sun,) studied this question.