Tannin and related polyphenolic substances strongly surface chelate with sensitizing nano-porous films of to the visible spectrum. The photovoltaic cell nano-porous n- -CuI generates highly stable photovoltages. The result is explained as the effectiveness of the -tannin complex on the surface of in preventing short-circuiting across the /CuI barrier.
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Tennakone et al. (1998) studied this question.
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