Investigation of charge transport in Vanadyl-phthalocyanine with molybdenum trioxide as a buffer layer: Impedance spectroscopic analysis
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
Charge transport in organic materials is one of the intrinsic properties, which governs the device performance. In this paper, we report the fabrication and electrical characterization of two diodes ITO/VOPc/MoO<inf>3</inf>/Al and ITO/VOPc/Al. We investigate the electrical conduction of Vanadyl phthalocyanine (VOPc) in both the devices and also the effect of MoO<inf>3</inf> as a buffer layer. Improvement of current density through the device is estimated using current density - voltage characteristics and capacitance - voltage characteristics. Space charge limited current (SCLC) conduction with an exponential trap distribution is observed from Impedance measurements. The dominant hopping charge transport is discussed based on ac conductivity measurements and by adopting Correlated barrier hopping (CBH) model. © 2015 Elsevier B.V. All rights reserved.
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Keywords
Buffer layers, Capacitance, Carrier transport, Charge transfer, Electric impedance, Molybdenum oxide, Nanobelts, Nitrogen compounds, Vanadium compounds, Capacitance voltage characteristic, Charge hopping, Current density-voltage characteristics, Electrical characterization, Exponential trap distribution, Molybdenum trioxide, Phthalocyanine, Space-charge-limited current, Spectroscopic analysis
Citation
Synthetic Metals, 2015, 210, , pp. 208-213