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Issue 2, 2019
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From nanofibers to ordered ZnO/NiO heterojunction arrays for self-powered and transparent UV photodetectors

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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

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Publication details

The article was received on 22 Nov 2018, accepted on 04 Dec 2018 and first published on 04 Dec 2018


Article type: Communication
DOI: 10.1039/C8TC05877F
J. Mater. Chem. C, 2019,7, 223-229

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    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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