The photocurrent response in solid-state films of two different hemoproteins, horseradish peroxidase and cytochrome c, was studied by employing a geometry of planar diode device. The highest occupied molecular orbital energy of the two solid-state hemoproteins was measured using photoelectron yield spectroscopy. Results showed that the photocurrent response of hemoprotein films under white light illumination was found extremely slow (ca. 160–480 s) owing to the charge blocking by insulating surrounding parts of which size resulted in largely different photocurrent time scale between the two hemoprotein films.

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See supplementary material at http://dx.doi.org/10.1063/1.4764948 for schematic illustration for charge transport through hemoproteins and fitting results for rising and decaying photocurrents.

Supplementary Material

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