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Computational modeling of nanosecond time-scale charge carrier dynamics in organic semiconductors

Published online by Cambridge University Press:  20 May 2015

Brian Johnson ,
Keshab Paudel  and
Oksana Ostroverkhova
Brian Johnson
Affiliation:
Oregon State University, Corvallis, OR, United States
Keshab Paudel
Affiliation:
Oregon State University, Corvallis, OR, United States
Oksana Ostroverkhova
Affiliation:
Oregon State University, Corvallis, OR, United States
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Abstract

We present a study of photoinduced charge carrier dynamics in single crystals and polycrystalline thin films of a functionalized fluorinated anthradithiophene (ADT) derivative, ADT-TES-F, combining measurements of time-resolved photocurrent with computational modeling. Simulations revealed two competing charge generation pathways: ultrafast charge separation and nanosecond (ns) time-scale exciton dissociation. Single crystals exhibited significantly enhanced fast charge photogeneration and charge carrier mobilities, as well as lower charge trap densities and free hole-trapped electron recombination, as compared to thin films. At sub-ns time scales after photoexcitation, the light intensity dependence of the photocurrents obtained in single crystals was determined by the carrier density-dependent recombination. At longer time scales, and at lower intensities, taking into account carrier concentration-dependent mobility improved agreement between numerically simulated and experimentally measured photocurrent data.

Keywords

photoconductivityorganicelectronic material
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1737: Symposium U – Organic Photovoltaics—Fundamentals, Materials and Devices , 2015 , mrsf14-1737-u03-05
Copyright
Copyright © Materials Research Society 2015 

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