Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.194
Publication date: 18th July 2019
Influence of cobalt additive in spiro-OMeTAD on charge recombination and carrier density in perovskite solar cells was investigated by impedance spectroscopy. It is found that the presence of cobalt additive can significantly improve the photovoltaic performance of PSCs via the suppression of charge recombination at the interface of perovskite layer and HTM layer, which leads to a more than doubled power conversion efficiency. In combination with time-resolved photoluminescence and computer simulation, we explored the interface interaction between our newly designed HTMs, (i.e DFS/FS) with sulfur atom and perovskite. We found that an additional electrostatic bonding was formed between sulfur atom in DFS/FS and hydrogen in methylammonium group in perovskite, which facilitated the fast charge extraction compared to spiro-OMeTAD. In combination with time-resolved photoluminescence and computer simulation, we explored the interface interaction between our newly designed HTMs, (i.e DFS/FS) with sulfur atom and perovskite. We found that an additional electrostatic bonding was formed between sulfur atom in DFS/FS and hydrogen in methylammonium group in perovskite, which facilitated the fast charge extraction compared to spiro-OMeTAD.
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