Characterization of polymer-fullerene mixtures for organic photovoltaics by systematically coarse-grained molecular simulations

DM Huang and AJ Moule and R Faller, FLUID PHASE EQUILIBRIA, 302, 21-25 (2011).

DOI: 10.1016/j.fluid.2010.07.025

Organic photovoltaic devices, which include polymer-based solar cells, show promise as cheap alternatives to silicon-based photovoltaics. Polymer solar cells use a mixture of a light-absorbing conducting polymer as the electron donor and a fullerene derivative as the electron acceptor in the solar cell's photoactive layer. The components are generally mixed together to produce a bicontinuous percolating network called a bulk heterojunction. In a previous paper 21 we developed a systematically coarse-grained simulation model of mixtures of the widely used conducting polymer poly(3-hexylthiophene) (P3HT) and the simplest fullerene C(60). Here we analyze the ensuing polymer structures and mixture morphologies to understand the local structure of these devices, which provide a crucial basis for the future optimization of bulk- heterojunction morphology. (C) 2010 Elsevier B.V. All rights reserved.

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