New Metallic Ordered Phase of Perovskite CsPbI3 under Pressure

Pressure‐induced electronic structure transition from insulating phase to metal state is a potential new paradigm for halide perovskites. The metallization based on these materials may afford a novel motif toward realizing new electronic properties even superconductivity phenomenon. Herein, how stat...

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Bibliographic Details
Published in:Advanced science 2019-07, Vol.6 (14), p.1900399-n/a
Main Authors: Liang, Yongfu, Huang, Xiaoli, Huang, Yanping, Wang, Xin, Li, Fangfei, Wang, Youchun, Tian, Fubo, Liu, Bingbing, Shen, Ze Xiang, Cui, Tian
Format: Article
Language:English
Subjects:
Communication
Communications
electronic structure
high pressure
metallization
perovskites
phase transition
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Summary:Pressure‐induced electronic structure transition from insulating phase to metal state is a potential new paradigm for halide perovskites. The metallization based on these materials may afford a novel motif toward realizing new electronic properties even superconductivity phenomenon. Herein, how static compression modulates the crystal and electronic structure of typical perovskite semiconductors cesium lead iodine (CsPbI3) by both experimental and theoretical studies is reported. The comprehensive studies discover the insulator–metal transition of CsPbI3 at 39.3 GPa, and reveal the key information behind the electronic transition. The perovskite's precise structural evolution is tracked upon compression, from orthorhombic Pnma phase to monoclinic C2/m structure before the metallic transition. More interestingly, the C2/m phase has the most distorted octahedra and the shortest Pb–I bond length relative to the average bond length that is ever reported in a halide perovskite structure. The electronic transition stems from the structural changes accompanied by the anomalously self‐distorted octahedra. These studies show that pressure can significantly alter the structural and electronic properties of these technologically important perovskites. High pressure is performed to modify the structure and electrical properties of halide perovskites. The pressure response of cesium lead iodine is significant, along with bandgap narrowing, anomalous self‐distorted octahedra and metallization, which promote its photovoltaic applications by better materials‐by‐design.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.201900399