Applied Physics Letters, Volume 118, Issue 8, February 2021. The diffusion coefficient (D) of charge carriers in pentacene has been determined independently using current–voltage and capacitance–frequency characteristics of asymmetric metal/pentacene/metal structures. The values of D measured using these two methods are found to be in excellent agreement. D has been estimated using first principles calculations and compared with experimental values. The applicability of the Einstein relation has been examined in organic semiconductors.

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