Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Publication date: 18th October 2023
Perovskite solar cells have exhibited remarkable growth, surpassing 16% device efficiency through chemical engineering. One of the most critical issues in perovskite research is the presence of grain boundaries on the film surface, which significantly impact device hysteresis, decomposition, and the suppression of optical properties. Several efforts have been made to increase grain size or to passivate grain boundaries using additives to enhance crystallization and device performance. However, understanding carrier dynamics at grain boundaries remains insufficient. In this study, we modified a commercial transient absorption spectroscopy (TAS) system at the microscale to separate signals from the grain interior and grain boundaries. Interestingly, distinct TA spectra features were observed at grain boundaries compared to the grain interior. Additionally, fast decay times were observed in contrast to our expectations. The different carrier dynamics at grain boundaries were analyzed in terms of halide composition differences. We believe that our data provide an accurate representation of the carrier dynamics at perovskite grain boundaries without overestimation.
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2022R1I1A1A01053885).
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