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Issue 5, 2013
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Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction

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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.

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

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Supplementary files

Article information


Submitted
21 Dec 2012
Accepted
08 Mar 2013
First published
20 Mar 2013

Energy Environ. Sci., 2013,6, 1546-1551
Article type
Paper

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

C. Groves, Energy Environ. Sci., 2013, 6, 1546
DOI: 10.1039/C3EE24455E

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