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Light intensity dependence of the photocurrent in organic photovoltaic devices
Cell Reports Physical Science, Volume: 3, Issue: 10, Start page: 101096
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The competition between recombination and extraction of carriers defines the charge collection efficiency and, therefore, the overall performance of organic photovoltaic devices, including solar cells and photodetectors. In this work, we describe different components of the steady-state light intens...
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The competition between recombination and extraction of carriers defines the charge collection efficiency and, therefore, the overall performance of organic photovoltaic devices, including solar cells and photodetectors. In this work, we describe different components of the steady-state light intensity-dependent photocurrent (IPC) and charge collection efficiency under operational conditions. Further, we demonstrate how different loss mechanisms can be identified based on their unique signatures in the IPC. In particular, we show how IPC can be used to distinguish first-order, trap-assisted recombination from other first-order photocurrent loss mechanisms, which dominate at the low-intensity characteristic of indoor light-harvesting applications. The theoretical framework is presented and verified by a one-dimensional drift-diffusion device model. Finally, the extended IPC methodology is validated on organic thin-film photovoltaic devices. We conclude that the relatively straightforward measurement of IPC over a large dynamic range can be a powerful tool for understanding solar and indoor device fundamentals.
organic semiconductors; thin-film devices; charge collection; photocurrent; charge recombination; space charge; series resistance; trap states; intensity dependence
Faculty of Science and Engineering
This work was supported by the Welsh Government’s Sêr Cymru II Program through the European Regional Development Fund, Welsh European Funding Office, and Swansea University strategic initiative in Sustainable Advanced Materials. A.A. is a Sêr Cymru II Rising Star Fellow, and P.M. is a Sêr Cymru II National Research Chair. This work was also funded by UKRI through EPSRC program grant EP/T028511/1, Application Targeted Integrated Photovoltaics.