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Multiple-engineering controlled growth of tunable-bandgap perovskite nanowires for high performance

2019-08-01

Authors: Ren, KK; Wang, J; Liu, K; Huang, YB; Sun, Y; Azam, M; Jin, P; Wang, ZJ; Qu, SC; Wang, ZG

RSC ADVANCES

Volume: 9 Issue: 34 Pages: 19772-19779 Published: JUN 24 2019 Language: English

Document type: Article

DOI: 10.1039/c9ra01689a

Abstract:

Controllable growth of perovskite nanowires is very important for various applications in optical and

electrical devices. Although significant progress has been achieved in the solution method, a deep

understanding of the mechanics of growing perovskite nanowires is still lacking. Herein, we developed an

electrochemical method for growing the perovskite nanowires and studied the growth processes

systematically. The initial nucleation and crystal growth could be controlled by simply varying the

additive solvents, thus leading to two stable size ratio distributions of the perovskite nanowires.

Further, with compositional engineering, the bandgap of the perovskites could be tuned from 1.59 eV to

3.04 eV. All the as-grown perovskite nanowires displayed a unique structure with high crystallization

quality, contributing to a very high responsivity of 2.1 A W-1 and a large on/off ratio of 5 x 10(3) for

the photodetectors based on the CH3NH3PbBr3 nanowires. All of these findings demonstrate that the

optimized solution method offers a new approach to synthesize perovskite nanowires for applications in

photoelectric devices.

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