Expansion of the porphyrin π electron system by using a tetrabenzoporphyrin (TBP) skeleton leads to better spectral match to the solar spectrum and high quantum yields when the porphyrins are used as sensitizers. Metallotetrabenzoporphyrins such as MgTBP and ZnTBP rank among the most efficient organic photoconducting materials studied so far.
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Yamashita et al. (1987) studied this question.
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