Abstract
Photo finish: Zinc-substituted cytochrome b562 (Zn-cyt b562) immobilized on a gold electrode is an n-type photodiode, whereas zinc-cytochrome c (Zn-cyt c) is a p-type photoconductor (see picture). DFT calculations indicate that the cytochrome band gaps are much lower than those estimated for smaller polypeptides. The semiconductor properties of these proteins depend on the charge distribution on their molecular surfaces.
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