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Controlled Substitution of Chlorine for Iodine in Single‐Crystal Nanofibers of Mixed Perovskite MAPbI 3– x Cl x
Author(s) -
Zhang Haihua,
Liao Qing,
Wang Xuedong,
Hu Ke,
Yao Jiannian,
Fu Hongbing
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201601201
Subject(s) - tetragonal crystal system , perovskite (structure) , materials science , halide , photoluminescence , crystallography , crystal structure , energy conversion efficiency , blueshift , crystal (programming language) , analytical chemistry (journal) , chemistry , inorganic chemistry , optoelectronics , chromatography , computer science , programming language
Longer carrier diffusion length and improved power conversion efficiency have been reported for thin‐film solar cell of organolead mixed‐halide perovskite MAPbI 3– x Cl x in comparison with MAPbI 3 . Instead of substituting I in the MAPbI 3 lattice, Cl‐incorporation has been shown to mainly improve the film morphology of perovskite absorber. Well‐defined crystal structure, adjustable composition ( x ), and regular morphology, remains a formidable task. Herein, a facile solution‐assembly method is reported for synthesizing single‐crystalline nanofibers (NFs) of tetragonal‐lattice MAPbI 3– x Cl x with the Cl‐content adjustable between 0 ≤ x ≤ 0.75, leading to a gradual blueshift of the absorption and photoluminescence maxima from x = 0 to 0.75. The photoresponsivity ( R ) of MAPbI 3 NFs keeps almost unchanging at a value independent of the white‐light illumination intensity ( P ). In contrast, R of MAPbI 3– x Cl x NFs decreases rapidly with increasing both the x and P values, indicating Cl‐substitution increases the recombination traps of photogenerated free electrons and holes. This study provides a model system to examine the role of extrinsic Cl ions in both perovskite crystallography and optoelectronic properties.