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Further analysis of space-charge-limited currents in polybenzo[c]thiophene films

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3 Author(s)
Musa, I. ; Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L693BX, United Kingdom ; Eccleston, W. ; Higgins, S.J.

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The temperature dependence of space-charge-limited currents in polybenzo[c]thiophene (PBCT) films in a sandwich structure of aluminum/PBCT/indium–tin–oxide is presented. Free carrier space-charge-limited currents are identified and the free carrier mobility has been estimated to be ∼3×10-5cm2 V-1 s-1. A trap of concentration ∼1.8×1017cm-3 and energy ∼0.67 eV from the highest occupied molecular orbital level is estimated. The thickness dependence of the current, at constant voltage, is very close to that expected for a space-charge-limited mechanism. The Tauc band gap determined by optical spectrophotometry was found to be ∼1.34 eV. © 1998 American Institute of Physics.

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Journal of Applied Physics  (Volume:83 ,  Issue: 10 )