Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.302
Publication date: 7th February 2022
The photogeneration of free charges in light-harvesting devices is a multi-step process, which can be challenging to probe due to the complexity of the involved inter-and-intramolecular energetic states and the competitive character of various driving mechanisms. Here, we present a technique which allows the measurement of photogenerated charge carrier densities sensitively and to probe charge generation processes in thin-film solar cells. Our technique is based on the integral time-of-flight method of sandwich-type thin-film devices but extended to the low intensity regime (LIITOF) and combined with voltage dependent device capacitance measurements. The theoretical framework of LIITOF is verified by drift-diffusion simulations and the applicability of our method is demonstrated on thin-film solar cells based on organic and perovskite semiconductors by examining the voltage dependence of charge generation efficiency. Our experimental results are compared to those obtained via Time Delayed Collection Field (TDCF) measurements conducted on the same devices and found to be in excellent agreement.
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