Issue 2, 2019

From nanofibers to ordered ZnO/NiO heterojunction arrays for self-powered and transparent UV photodetectors

Abstract

Uniformly aligned electrospun nanofiber arrays are important building blocks for high-performance functional devices and device arrays. However, it remains a challenge to prepare perfectly aligned and large area nanofiber arrays using common electrospinning. In this work, a modified electrospinning method utilizing three assisted electrodes for nanofiber collection was proposed to achieve uniformly aligned and millimeter-long ZnO and NiO nanofiber arrays (more than 90% of nanofibers aligned to within ±4° of the desired direction), which were further fabricated into ZnO/NiO heterojunction arrays with a density of 106 cm−2. Photodetectors (PDs) based on the as-prepared ZnO/NiO heterojunction arrays exhibited excellent ultraviolet (UV) selective and self-powered detection properties because of the properly matched energy bands of ZnO and NiO. A maximum responsivity of 0.415 mA W−1 and a short rise/decay time of 7.5 s/4.8 s at 0 V bias of the device markedly outstripped the reference ZnO nanofiber array device. The three-assisted-electrode electrospinning method of this work offers new chances in novel nanostructure design and high-performance device fabrication.

Graphical abstract: From nanofibers to ordered ZnO/NiO heterojunction arrays for self-powered and transparent UV photodetectors

Supplementary files

Article information

Article type
Communication
Submitted
22 Nov 2018
Accepted
04 Des 2018
First published
04 Des 2018

J. Mater. Chem. C, 2019,7, 223-229

From nanofibers to ordered ZnO/NiO heterojunction arrays for self-powered and transparent UV photodetectors

Z. Zhang, Y. Ning and X. Fang, J. Mater. Chem. C, 2019, 7, 223 DOI: 10.1039/C8TC05877F

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