Colorless to black switching with high contrast ratio via the electrochemical process of a hybrid organic–inorganic perovskite
Ming Xu,
Jianmin Gu,
Zixun Fang,
Yu Li,
Xing Wang,
Xiaoyu Zhao,
Tifeng Jiao,
Wei Wang
Affiliations
Ming Xu
State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao China
Jianmin Gu
State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao China
Zixun Fang
State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao China
Yu Li
State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao China
Xing Wang
State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao China
Xiaoyu Zhao
Department of Food and Pharmaceutical Engineering Suihua University Suihua China
Tifeng Jiao
State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao China
Wei Wang
Department of Chemistry, Centre for Pharmacy University of Bergen Bergen Norway
Abstract Colorless‐to‐black switching has attracted widespread attention for smart windows and multifunctional displays because they are more useful to control solar energy. However, it still remains a challenge owing to the tremendous difficulties in the design of completely reverse absorptions in transmissive and colored states. Herein, we report on an electrochemical device that can switch between colorless and black by using the electrochemical process of hybrid organic–inorganic perovskite MAPbBr3, which shows a high integrated contrast ratio of up to 73% from 400 to 800 nm. The perovskite solution can be used as the active layer to assemble the device, showing superior transmittance over the entire visible region in neutral states. By applying an appropriate voltage, the device undergoes reversible switching between colorless and black, which is attributed to the formation of lead and Br2 in the redox reaction induced by the electron transfer process in MAPbBr3. In addition, the contrast ratio can be modulated over the entire visible region by changing the concentration and the applied voltage. These results contribute toward gaining an insightful understanding of the electrochemical process of perovskites and greatly promoting the development of switchable devices.
