Abstract
Abstract The current–voltage (I–V), capacitance–frequency (C–f), and capacitance–voltage (C–V) characteristics of organic diodes with a pentacene/aluminum Sckottky contact have been investigated. From the measured diode capacitances, it is revealed that the frequency-dependent properties are related to the localized traps in the band gap of pentacene. The C–V characteristics for different test frequencies are presented. In the low frequency region, the capacitance is nearly constant with reverse bias and increase with the forward bias. With even higher forward bias, the capacitance gradually decreases, which is due to the detrapping of the trapped charges. The intrinsic charge carrier concentration in pentacene was extracted as 3.1×1017 cm−3 from the C–V characteristics. The C–V properties of the pentacene-based metal-oxide-semiconductor structure have also studied.
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