Current-voltage characteristics of poly(3-hexylthiophene) diodes at room temperature

Giulianini, Michele; Waclawik, Eric R.; Bell, John M.; Motta, Nunzio
February 2009
Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p083302
Academic Journal
We report on the analysis of current-voltage characteristics of regioregular poly(3-hexylthiophene) diodes. Experimental curves were fitted to two models, to take into account at low-moderate electric fields Schottky behavior mixed with space charge limited current (SCLC) regime and, at higher fields, trap-free SCLC. The results provide a description of IV curves over five decades, along with the determination of zero field and effective mobility and the field dependence prefactor. Forward and reverse IV measurements highlighted the presence of shallow and deep localized states inside the band gap. The latter enhance the current over time and have been modeled as an inductorlike element.


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