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

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 perform...

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Bibliographic Details
Published in:Sustainable energy & fuels 2020-02, Vol.4 (2), p.878-883
Main Authors: Wu, Pengfei, Ma, Xiaotong, Zhao, Baohua, Liu, Chengben, Chen, Yanli, Yang, Guangwu, Li, Xiyou
Format: Article
Language:English
Online Access:Get full text
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Summary: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 TiO 2 (mp-TiO 2 ) 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-TiO 2 is enhanced due to the interactions between the functional groups (-COOH, -NH 2 and -SH) of l -cy and Ti 4+ ions in mp-TiO 2 and unsaturated Pb 2+ and I − ions in the perovskite film. This work demonstrates a facile and effective method to achieve high-performance PSCs. A typical trifunctional amino acid, l (+)-cysteine, is employed to modify the interface between mesoporous TiO 2 and perovskite film, and promotes the power conversion efficiency of perovskite solar cells from 11.5% to 14.4%.
ISSN:2398-4902
DOI:10.1039/c9se00963a