Lead‐Free Halide Double Perovskite Cs2AgBiBr6 with Decreased Bandgap

Fuxiang Ji, Johan Klarbring, Feng Wang, Weihua Ning*, Linqin Wang, Chunyang Yin, José Silvestre, Mendoza Figueroa, Christian Kolle Christensen, Martin Etter, Thomas Ederth, Licheng Sun, Sergei Simak, Igor Abrikosov, Feng Gao*

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Abstrakt

Environmentally friendly halide double perovskites with improved stability are regarded as a promising alternative to lead halide perovskites. The benchmark double perovskite, Cs 2 AgBiBr 6 , shows attractive optical and electronic features, making it promising for high-efficiency optoelectronic devices. However, the large band gap limits its further applications, especially for photovoltaics. Herein, we develop a novel crystal-engineering strategy to significantly decrease the band gap by approximately 0.26 eV, reaching the smallest reported band gap of 1.72 eV for Cs 2 AgBiBr 6 under ambient conditions. The band-gap narrowing is confirmed by both absorption and photoluminescence measurements. Our first-principles calculations indicate that enhanced Ag-Bi disorder has a large impact on the band structure and decreases the band gap, providing a possible explanation of the observed band-gap narrowing effect. This work provides new insights for achieving lead-free double perovskites with suitable band gaps for optoelectronic applications.

OriginalsprogEngelsk
TidsskriftAngewandte Chemie International Edition
Vol/bind59
Udgave nummer35
Sider (fra-til)15191-15194
ISSN1433-7851
DOI
StatusUdgivet - 24. aug. 2020
Udgivet eksterntJa

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