Charge transport properties in pentacene films: Evaluation of carrier mobility by different techniques

Charge carrier mobility in pentacene is determined using three different methods, the standard one being the field effect transistor (FET), and the others, not much explored in organic materials are the impedance spectroscopy and the space charge limited current (SCLC). We have found that the FET technique yields exaggerated mobility values. We have obtained a mobility of 3.5 × 10−2 cm2/V s for an applied electrical field of 3 × 107 V/m. We have characterized the growth and structural organization of pentacene layers using AFM and X-ray diffraction measurements to support our interpretation of the transport mechanisms.

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► We characterized the structure of pentacene layers using AFM and X-ray diffraction.
► To investigate the pentacene mobility, we developed easier straightforward methods.
► We showed charge carrier mobility in pentacene depends on the measurement technique.
► The techniques are complementary to study transversal and longitudinal transports.