title: Bandgap tunable Csx(CH3NH3)1-xPbI3perovskite nanowires by aqueous solution synthesis for optoelectronic devices.
abstract: To date, all the lead halide based full-inorganic or organic-inorganic hybrid perovskites have been synthesized from organic solvent, such as N,N-dimethylformamide (DMF) or dimethyl sulfoxide (DMSO), by a solution method. Herein, water has been utilized as a 'green' solvent to develop an efficient synthetic route to grow various kinds of lead halide perovskite nanowires (NWs). By controlling the proportion of the hybrid cations, Csx(CH3NH3)1-xPbI3perovskite NWs were successfully synthesized. Every Csx(CH3NH3)1-xPbI3perovskite NW demonstrated single crystal characteristics with uniform stoichiometric element distribution. Because of the controllable cation composition, the NW bandgaps could be finely tuned from 1.5 to 1.7 eV. Transient photoluminescence spectra showed superior NW quality when compared with those of the conventional DMF-based NWs. Based on the abovementioned high quality single Cs0.5(CH3NH3)0.5PbI3perovskite NW, a reliable single-NW photodetector was fabricated to investigate the optoelectronic application. It demonstrated a responsivity of 23 A/W, exceeding most of the reported values in the perovskite nanowire photoconductive detectors, and the shot-noise normalized detectivity was 2.5 × 1011Jones comparable to the parameters of the commercial silicon-based nanowires. The green and robust synthesis method, finely tunable NW bandgaps, and superior optoelectronic properties are expected to open a new door for the development of perovskite optoelectronic devices.
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Dong
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Deng
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Chao
authors.initials: C
authors.lastname: Hu
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Huaibing
authors.initials: H
authors.lastname: Song
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Keke
authors.initials: K
authors.lastname: Qiao
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Xiaokun
authors.initials: X
authors.lastname: Yang
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Fensha
authors.initials: F
authors.lastname: Cai
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Jiang
authors.initials: J
authors.lastname: Tang
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, 430074, Wuhan, Hubei, P. R. China. songhs-wnlo@mail.hust.edu.cn.
authors.forename: Haisheng
authors.identifier: http://orcid.org/0000-0002-5921-0913
authors.initials: H
authors.lastname: Song