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(a) 3D molecular structure of hemoproteins (HRP and cyt c) and schematic illustration of planar diode device with hemoprotein films. (b) Optical absorption spectra of hemoproteins in solutions (top) and films (bottom): Arrows denote the last band edges of each hemoprotein. (c) PE yield spectra of hemoprotein films coated on glass substrates. (d) Flat energy band diagram of HRP and cyt c with respect to the work function of ITO.
I-V characteristics of the planar diode devices with the HRP film (a) and the cyt c film (b) under white light illumination: PIN (mW/cm2) = 0 (P0), 0.01 (P1), 0.1 (P2), 1 (P3), 5 (P4), 10 (P5), 50 (P6), and 100 (P7). (c) Logarithmic plots of photocurrent (I) and PIN for the power-law model (I ∼ PIN α ) at high (−10 V) and low (−2 V) voltages. (d) Change of α values (slopes from the power-law model) according to the bias voltage.
Photocurrent change (left graphs) as a function of time for the planar diode devices with the HRP film (a) and the cyt c film (b) under white light illumination (PIN = 100 mW/cm2 at −5 V): The black arrows denote the light ON and OFF points. Graphs in the right parts show the enlarged plots of light on and off points for each left graph (the green arrows denote the direction of current fluctuation).
(a)–(e) Cartoons for explaining the photocurrent fluctuation measured in Fig. 3 (right graphs): Black arrows denote corresponding sequential flow. (f) Conceptual energy band diagram for molecular quantum well in single hemoprotein molecule.
Summary of fitting parameters for the rise and decay photocurrent signals in Fig. 3.
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