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17 October 2013 Empirically based device modeling of bulk heterojunction organic photovoltaics
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An empirically based, open source, optoelectronic model is constructed to accurately simulate organic photovoltaic (OPV) devices. Bulk heterojunction OPV devices based on a new low band gap dithienothiophene- diketopyrrolopyrrole donor polymer (P(TBT-DPP)) are blended with PC70BM and processed under various conditions, with efficiencies up to 4.7%. The mobilities of electrons and holes, bimolecular recombination coefficients, exciton quenching efficiencies in donor and acceptor domains and optical constants of these devices are measured and input into the simulator to yield photocurrent with less than 7% error. The results from this model not only show carrier activity in the active layer but also elucidate new routes of device optimization by varying donor-acceptor composition as a function of position. Sets of high and low performance devices are investigated and compared side-by-side.
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Adrien Pierre, Shaofeng Lu, Ian A. Howard, Antonio Facchetti, and Ana Claudia Arias "Empirically based device modeling of bulk heterojunction organic photovoltaics", Proc. SPIE 8830, Organic Photovoltaics XIV, 883011 (17 October 2013);

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