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Characterizing the charge collection efficiency in bulk heterojunction organic photovoltaic cells
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/content/aip/journal/apl/100/8/10.1063/1.3686909
2012-02-22
2014-07-24

Abstract

We demonstrate a technique for determining the charge collection efficiency (ηCC) in bulk heterojunction organic photovoltaic cells (OPVs). To extract ηCC, we describe an approach to measure the optical absorption efficiency by examining the external quantum efficiency under reverse bias. Using estimates of the excitondiffusion efficiency obtained from photoluminescence quenching measurements, ηCC is calculated without any input from optical field simulations. For bulk heterojunction OPVs based on the donor-acceptor pairing of boron subphthalocyanine chloride and C60, a peak ηCC of (79 ± 2)% is realized for films containing 80 wt. % C60 under short-circuit conditions. This optimum composition also coincides with a peak in the fill factor and the short-circuit current density.

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Scitation: Characterizing the charge collection efficiency in bulk heterojunction organic photovoltaic cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/8/10.1063/1.3686909
10.1063/1.3686909
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