Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.019
Publication date: 21st February 2018
The performance of solar cells based on molecular electronic materials is limited by relatively high non-radiative voltage losses . The primary pathway for non-radiative recombination in organic donor: acceptor heterojunction devices is believed to be the decay of a charge-transfer (CT) excited state to ground via energy transfer to vibrational modes. Recently, it was shown that the transition rate depends on the Franck-Condon factor describing the overlap of the CT and ground-state vibrational states and, therefore, on the energy of the CT state. However, experimental data do not always follow the trends suggested by the simple model. Here, we extend this recombination model to include other factors that influence the non-radiative decay rate – and therefore the open-circuit voltage – but have not yet been explored in detail. We use the extended model to understand the observed behavior of series of small molecule:fullerene blend devices, where open-circuit voltage appears insensitive to non-radiative loss. The trend could only be explained in terms of a microstructure dependent CT state oscillator strength. We present design rules for improving open-circuit voltage via control of materials parameters and propose a realistic limit to the power conversion efficiency of organic solar cells.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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