Publication details for Dr Chris GrovesGroves, C. (2013). Suppression of geminate charge recombination in organic photovoltaic devices with a cascaded energy heterojunction. Energy and Environmental Science 6(5): 1546-1551.
- Publication type: Journal Article
- ISSN/ISBN: 1754-5692, 1754-5706
- DOI: 10.1039/C3EE24455E
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
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.