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Gate voltage dependence of the photocurrent yield spectra measured at different gate voltages. The two low-energy peaks at and have previously been identified (Refs. 9 and 10) as transitions to the Davydov-split singlet excitons (Ref. 9) while the ones at and are charge-transfer transitions between pentacene molecules (Ref. 10).
Photocurrent voltage characteristics measured with incident wavelength tuned to the second singlet excitation . The lines are second order polynomial fits to the data as described in the text. (Inset) Gate voltage dependence of the hole mobility determined using Eq. (2).
Direct current voltage curves for various gate voltages. The lines are third order polynomial fits to the data as described in the text.
Gate voltage dependence of the hole mobility (open squares, left axis) extracted from the photocurrent measurements, and the free carrier density (solid circles, right axis) determined by fitting the direct measurements using the average experimental mobility. (Inset) The average mobility as a function of free hole density.
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