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Investigation of electronic trap states in organic photovoltaic materials by current-based deep level transient spectroscopy

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4 Author(s)
Neugebauer, Stefan ; Experimental Physics VI, Faculty of Physics and Astronomy, Julius-Maximilians University of Würzburg, Am Hubland, 97074 Würzburg, Germany ; Rauh, Julia ; Deibel, Carsten ; Dyakonov, Vladimir

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Current-based deep level transient spectroscopy was used to study trap states in poly(3-hexylthiophene-2,5-diyl) (P3HT), [6,6]-phenyl-C61 butyric acid methyl ester (PCBM), and P3HT:PCBM blend. The obtained spectra showed traps of 87 meV activation energy in pure P3HT and 21 meV for PCBM. The blend shows a complex emission rate spectrum consisting of several different emission rate bands in the range of 0.1–30 s-1, yielding activation energies between about 30 meV and 160 meV.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 26 )

Date of Publication:

Jun 2012

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