6 October 2014 Understanding charge transport in vacuum deposited Schottky organic solar cells with microsecond transient photocurrent measurements
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Abstract
Schottky-junction organic solar cells have been a topic of intense research in recent times due to their surprisingly high performance. Some aspects of their device physics are well understood but charge transport in neat-C60 and donor-doped Schottky junction OSCs has not been studied in detail so far. In this study, charge transport in neat-C60 OSCs is examined by studying the performance of these OSCs as a function of C60 active layer thickness. Surprisingly, the fillfactor of the neat-C60 Schottky OSC does not degrade for layer thicknesses between 20 nm – 80 nm indicating that charge transport is not an issue. However, the short-circuit current decreases significantly due to a reduction in the builtin voltage. The dissociation of excitons formed in C60 aggregates is preferentially reduced. Devices with thicker C60 layers and consequently, higher C60 aggregation, were found to have greater recombination. Finally, charge mobility in C60 films with aggregates is found to be lower than charge mobility in films with little to no aggregation.
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Sibi Sutty, Graeme Williams, Hany Aziz, "Understanding charge transport in vacuum deposited Schottky organic solar cells with microsecond transient photocurrent measurements", Proc. SPIE 9184, Organic Photovoltaics XV, 91841P (6 October 2014); doi: 10.1117/12.2061067; https://doi.org/10.1117/12.2061067
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