Controlled Substitution of Chlorine for Iodine in Single‐Crystal Nanofibers of Mixed Perovskite MAPbI3–xClx. Issue 28 (1st June 2016)

• Record Type: Journal Article
• Authors: Zhang, Haihua; Liao, Qing; Wang, Xuedong; Hu, Ke; Yao, Jiannian; Fu, Hongbing
• Is Part Of: Small. Volume 12:Issue 28(2016)
• Page Start: 3780
• Page End: 3787
• Publication Date: 2016-06-01
• Subjects: MAPbI3‐xClx -- nanofibers -- perovskite -- photodetectors -- self‐assembly; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201601201
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract : Longer carrier diffusion length and improved power conversion efficiency have been reported for thin‐film solar cell of organolead mixed‐halide perovskite MAPbI3– x Cl x in comparison with MAPbI3 . Instead of substituting I in the MAPbI3 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 MAPbI3– 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 MAPbI3 NFs keeps almost unchanging at a value independent of the white‐light illumination intensity ( P ). In contrast, R of MAPbI3– 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. Abstract : Cl‐substitution self‐assembled single‐crystalline nanofibers (NFs) of tetragonal‐lattice MAPbI3– x Cl x with the Cl‐content adjustable between 0 ≤ x ≤ 0.75 are synthesized by a facile solution method. Cl‐substitution positions of halide octahedra, optical bandgap, and photoconductivity of MAPbI3– x Cl x NFs are investigated here, providing a model system to examine the role of extrinsic Cl ions in both perovskite crystallography and optoelectronic properties.