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Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction

Groves, C.

Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction Thumbnail


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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.

Citation

Groves, C. (2013). Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction. Energy & Environmental Science, 6(5), 1546-1551. https://doi.org/10.1039/c3ee24455e

Journal Article Type Article
Publication Date May 1, 2013
Deposit Date May 14, 2013
Publicly Available Date Mar 29, 2024
Journal Energy & Environmental Science
Print ISSN 1754-5692
Electronic ISSN 1754-5706
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 5
Pages 1546-1551
DOI https://doi.org/10.1039/c3ee24455e

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