光致变色
卤化物
钙钛矿(结构)
材料科学
带隙
亚稳态
发光
光化学
光电子学
结晶学
化学
纳米技术
无机化学
有机化学
作者
Anil Kanwat,Biplab Ghosh,Si En Ng,Prem Jyoti Singh Rana,Yulia Lekina,Thomas J. N. Hooper,Natalia Yantara,Mikhail Kovalev,Bhumika Chaudhary,Priyanka Kajal,Benny Febriansyah,Qi Ying Tan,Maciej Klein,Zexiang Shen,Joel W. Ager,Subodh Mhaisalkar,Nripan Mathews
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-01-18
卷期号:16 (2): 2942-2952
被引量:23
标识
DOI:10.1021/acsnano.1c10098
摘要
Extending halide perovskites' optoelectronic properties to stimuli-responsive chromism enables switchable optoelectronics, information display, and smart window applications. Here, we demonstrate a band gap tunability (chromism) via crystal structure transformation from three-dimensional FAPbBr3 to a ⟨110⟩ oriented FAn+2PbnBr3n+2 structure using a mono-halide/cation composition (FA/Pb) tuning. Furthermore, we illustrate reversible photochromism in halide perovskite by modulating the intermediate n phase in the FAn+2PbnBr3n+2 structure, enabling greater control of the optical band gap and luminescence of a ⟨110⟩ oriented mono-halide/cation perovskite. Proton transfer reaction-mass spectroscopy carried out to precisely quantify the decomposition product reveals that the organic solvent in the film is a key contributor to the structural transformation and, therefore, the chromism in the ⟨110⟩ structure. These intermediate n phases (2 ≤ n ≤ ∞) stabilize in metastable states in the FAn+2PbnBr3n+2 system, which is accessible via strain or optical or thermal input. The structure reversibility in the ⟨110⟩ perovskite allowed us to demonstrate a class of photochromic sensors capable of self-adaptation to lighting.
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