Abstract
By using time-resolved electric-field-induced optical second-harmonic generation (TR-EFISHG) measurements, we studied the voltage establishment in an indium tin oxide (ITO)/polyimide/pentacene/Au double-layer device in terms of Maxwell–Wagner type charging and discharging. Results showed that the voltage establishment and relaxation in the pentacene layer depend on the polarity of the applied voltage, suggesting different carrier behaviors of electrons and holes in the pentacene layer. The interfacial relaxation time (τMW) also showed a different voltage dependence on the carrier species. A computer simulation using the relaxation time ratio Tr (= τRC/τMW) well accounts for the results.
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