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Durham Research Online
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Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction.

Groves, C. (2013) 'Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction.', Energy and environmental science., 6 (5). pp. 1546-1551.

Abstract

The effect of cascaded energy heterojunctions on geminate charge recombination in organic photovoltaic devices is examined using a kinetic Monte Carlo model. The structure of the cascaded heterojunction, which encourages spatial separation of the geminate charge pair, is varied to recreate that found in ternary blends and tri-layers, as well as that formed by self-organization in binary blends in which one component crystallizes. It is shown that substantial reductions in charge recombination can indeed be achieved with parameters similar that reported for P3HT:PCBM solar cells. However, the efficacy of cascaded energy heterojunctions is shown to be limited for thick cascade layers (>10 nm). This provides guidance as how to design ternary organic photovoltaics, whilst also offering a possible explanation of low recombination efficiency in some semi-crystalline OPVs.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1039/C3EE24455E
Date accepted:No date available
Date deposited:11 February 2014
Date of first online publication:May 2013
Date first made open access:No date available

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