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Modifying perovskite solar cells with l(+)-cysteine at the interface between mesoporous TiO2 and perovskite

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Abstract

Perovskite solar cells (PSCs) have attracted extensive attention and their which power conversion efficiency (PCE) has rapidly increased from 3.8% to 25.2% in recent years. Interfacial modification is regarded as a highly effective strategy to address the humidity instability and improve the performance of PSCs. In this regard, L(+)-cysteine (L-cy), a typical trifunctional amino acid, is employed to modify the interface between mesoporous TiO2 (mp-TiO2) and perovskite. The incorporation of L-cy increases the PCE from 11.5% to 14.4%. Fluorescence measurements show that the electron injection from perovskite to mp-TiO2 is enhanced due to the interactions between the functional groups (–COOH, –NH2 and –SH) of L-cy and Ti4+ ions in mp-TiO2 and unsaturated Pb2+ and I ions in the perovskite film. This work demonstrates a facile and effective method to achieve high-performance PSCs.

Graphical abstract: Modifying perovskite solar cells with l(+)-cysteine at the interface between mesoporous TiO2 and perovskite

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Publication details

The article was received on 17 Oct 2019, accepted on 30 Nov 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9SE00963A
Sustainable Energy Fuels, 2020, Advance Article

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    Modifying perovskite solar cells with L(+)-cysteine at the interface between mesoporous TiO2 and perovskite

    P. Wu, X. Ma, B. Zhao, C. Liu, Y. Chen, G. Yang and X. Li, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/C9SE00963A

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