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A 0D/3D Heterostructured All‐Inorganic Halide Perovskite Solar Cell with High Performance and Enhanced Phase Stability
Author(s) -
Bai Fujin,
Zhang Jie,
Yuan Yufei,
Liu Hongbin,
Li Xiaosong,
Chueh ChuChen,
Yan He,
Zhu Zonglong,
Jen Alex K.Y.
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201904735
Subject(s) - materials science , perovskite (structure) , halide , orthorhombic crystal system , heterojunction , phase (matter) , energy conversion efficiency , stoichiometry , nanotechnology , chemical engineering , solar cell , optoelectronics , inorganic chemistry , crystallography , crystal structure , chemistry , organic chemistry , engineering
Although organic–inorganic hybrid perovskite solar cells (PVSCs) have achieved dramatic improvement in device efficiency, their long‐term stability remains a major concern prior to commercialization. To address this issue, extensive research efforts are dedicated to exploiting all‐inorganic PVSCs by using cesium (Cs)‐based perovskite materials, such as α‐CsPbI 3 . However, the black‐phase CsPbI 3 (cubic α‐CsPbI 3 and orthorhombic γ‐CsPbI 3 phases) is not stable at room temperature, and it tends to convert to the nonperovskite δ‐CsPbI 3 phase. Here, a simple yet effective approach is described to prepare stable black‐phase CsPbI 3 by forming a heterostructure comprising 0D Cs 4 PbI 6 and γ‐CsPbI 3 through tuning the stoichiometry of the precursors between CsI and PbI. Such heterostructure is manifested to enable the realization of a stable all‐inorganic PVSC with a high power conversion efficiency of 16.39%. This work provides a new perspective for developing high‐performance and stable all‐inorganic PVSCs.