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Influence of substrate on crystallization in polythiophene/fullerene blends



Lee J. Richter, Christine He, David Germack, R Joseph Kline, Dean DeLongchamp, Daniel A. Fischer, Chad R. Snyder, James G. Kushmerick


The nanoscale morphology of the active layer in organic, bulk heterojunction (BHJ) solar cells is crucial to device performance. Often a combination of casting conditions and post deposition thermal treatment are used to optimize the morphology. In general, the development of microscopic crystals is deleterious, as the exciton diffusion length is 10 nm. We find that the microscopic crystallization kinetics in polythiophene/fullerene blends are strongly influenced by the substrate on which the BHJ is cast. This has significant implications for the practical screening of thermal treatments and the mechanisms for crystal growth.
Solar Energy Materials and Solar Cells


"energy", "nanotechnology", "photovoltaics", "polymer", "fullerene", "crystallization", "microscopy", "AFM", "NEXAFS".


Richter, L. , He, C. , Germack, D. , Kline, R. , DeLongchamp, D. , Fischer, D. , Snyder, C. and Kushmerick, J. (2011), Influence of substrate on crystallization in polythiophene/fullerene blends, Solar Energy Materials and Solar Cells, [online],, (Accessed July 17, 2024)


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Created January 13, 2011, Updated April 11, 2023