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Issue 44, 2017
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High-performance self-powered UV-Vis-NIR photodetectors based on horizontally aligned GaN microwire array/Si heterojunctions

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Abstract

Considering their reduced size and weight, low cost and portability, self-powered photodetectors that can be functioned independently of an external power supply are extremely important for developing future sensor networks and Internets of Things. Here, we present a self-powered photodetector with a broadband wavelength photoresponse from the ultraviolet to near-infrared region based on GaN microwire array/Si heterojunctions. Due to the highly efficient separation of photogenerated charge carriers, the photodetector shows ultrahigh EQE, responsivity and detectivity, reaching up to 71%, 4.7 × 102 mA W−1 and 9.5 × 1012 Jones, respectively, at zero bias in the 320–850 nm range. A fast response is observed with rise/decay times as low as 2/2 ms. The LDR values are over 80 dB. The performance characteristics are competitive with commercially available biased photodetectors and other reported heterojunction self-powered broadband photodetectors in the literature. In addition, a binary photoresponse is observed under small bias voltages. The heterostructures are fabricated by directly heteroepitaxially growing GaN microwires on patterned Si, enabling large-area device applications, and stand out from low-dimensional semiconductor photodetection systems. The overall high performance coupled with large-scale production makes GaN microwire array/Si heterojunctions promising for practical self-powered broadband photodetectors.

Graphical abstract: High-performance self-powered UV-Vis-NIR photodetectors based on horizontally aligned GaN microwire array/Si heterojunctions

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Publication details

The article was received on 13 Sep 2017, accepted on 19 Oct 2017 and first published on 19 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC04184E
Citation: J. Mater. Chem. C, 2017,5, 11551-11558
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    High-performance self-powered UV-Vis-NIR photodetectors based on horizontally aligned GaN microwire array/Si heterojunctions

    W. Song, X. Wang, H. Chen, D. Guo, M. Qi, H. Wang, X. Luo, X. Luo, G. Li and S. Li, J. Mater. Chem. C, 2017, 5, 11551
    DOI: 10.1039/C7TC04184E

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