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The Influence of Morphology on the Charge Transport in Two-Phase Disordered Organic Systems

Published online by Cambridge University Press:  20 May 2015

Cristiano F. Woellner ,
Leonardo D. Machado ,
Pedro A. S. Autreto ,
José A. Freire  and
Douglas S. Galvão
Cristiano F. Woellner
Affiliation:
Applied Physics Department, State University of Campinas, 13083-970 Campinas, São Paulo, Brazil.
Leonardo D. Machado
Affiliation:
Applied Physics Department, State University of Campinas, 13083-970 Campinas, São Paulo, Brazil.
Pedro A. S. Autreto
Affiliation:
Applied Physics Department, State University of Campinas, 13083-970 Campinas, São Paulo, Brazil.
José A. Freire
Affiliation:
Physics Department, Federal University of Paraná, 81531-990, Curitiba, Paraná, Brazil
Douglas S. Galvão
Affiliation:
Applied Physics Department, State University of Campinas, 13083-970 Campinas, São Paulo, Brazil.
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Abstract

In this work we use a three-dimensional Pauli master equation to investigate the charge carrier mobility of a two-phase system, which can mimic donor-acceptor and amorphous-crystalline bulk heterojunctions. Our approach can be separated into two parts: the morphology generation and the charge transport modeling in the generated blend. The morphology part is based on a Monte Carlo simulation of binary mixtures (donor/acceptor). The second part is carried out by numerically solving the steady-state Pauli master equation. By taking the energetic disorder of each phase, their energy offset and domain morphology into consideration, we show that the carrier mobility can have a significant different behavior when compared to a one-phase system. When the energy offset is non-zero, we show that the mobility electric field dependence switches from negative to positive at a threshold field proportional to the energy offset. Additionally, the influence of morphology, through the domain size and the interfacial roughness parameters, on the transport was also investigated.

Keywords

blendmorphologyphotovoltaic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1737: Symposium U – Organic Photovoltaics—Fundamentals, Materials and Devices , 2015 , mrsf14-1737-u18-21
Copyright
Copyright © Materials Research Society 2015 

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References

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