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[UNIST] A research team, led by Professor Sang Il Seok in the School of Energy and Chemical Engineering at UNIST has set a new efficiency record for a perovskite solar cell (PSC) at 25.8% by forming an interlayer between electron-transporting and perovskite layers to minimize interfacial defects, contributing to the decrease in the power conversion efficiencies. The new record, according to the research team, is the world’s highest power conversion efficiency (PCE) reported so far. Besides, the record, certified by National Renewable Energy Laboratory (NREL), is also the highest confirmed conversion efficiency of 25.5%.
In perovskite solar cells, the interfaces between the perovskite and charge-transporting layers contain high concentrations of defects, specifically deep-level defects, which substantially reduce the power conversion efficiency of the devices, noted the research team. Efforts have been made to reduce these interfacial defects have focused mainly on surface passivation. Yet, passivating the perovskite surface that interfaces with the electron-transporting layer has been difficult, because the surface-treatment agents on the electron-transporting layer may dissolve while coating the perovskite thin film.
“Alternatively, interfacial defects may not be a concern if a coherent interface could be formed between the electron-transporting and perovskite layers,” said the research team.
The findings of this research have been published in the October 2021 issue of Nature.
Journal Reference
Hanul Min, Do Yoon Lee, Junu Kim, et al., “Perovskite solar cells with atomically coherent interlayers on SnO2 electrodes,” Nature (2021). Perovskite solar cells with atomically coherent interlayers on SnO2 electrodes | Nature
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