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Computational characterization of bulk heterojunction nanomorphology
Journal of Applied Physics
  • Olga Wodo, Iowa State University
  • Srikanta Tirthapura, Iowa State University
  • Sumit Chaudhary, Iowa State University
  • Baskar Ganapathysubramanian, Iowa State University
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The bulk heterojunction (BHJ) nanomorphology in organic solar cells strongly affects the final efficiency of the device. Progress in experimental techniques now allows visualization of the complex 3D BHJ morphology. It is, therefore, important to characterize the topological properties of the morphology in order to quantify the link between morphology features and performance. Here, we introduce a suite of morphology descriptors which encode the complex nature of the multi-stage photovoltaic process in the BHJ. These morphology descriptors are easily determined using an approach based on converting the morphology into an equivalent weighted, labeled, undirected graph. We show how these descriptors can be used to interrogate BHJ morphologies, allow identification of bottlenecks in the photovoltaic process, and conduct quantitative comparison between morphologies with respect to each sub-process in the photovoltaic phenomena. This framework provides a simple and easy-to-use characterization tool that can be used to unravel the impact of morphology on complex transport phenomena.

The following article appeared in Journal of Applied Physics 112, 064316 (2012); and may be found at doi: 10.1063/1.4752864.

Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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American Institute of Physics
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Olga Wodo, Srikanta Tirthapura, Sumit Chaudhary and Baskar Ganapathysubramanian. "Computational characterization of bulk heterojunction nanomorphology" Journal of Applied Physics Vol. 112 Iss. 6 (2012) p. 064316-1 - 064316-6
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