3D Solar‐Blind Ga2O3 Photodetector Array Realized Via Origami Method

• Published in: Advanced functional materials Vol. 29; no. 50
• Main Authors: Chen, Yancheng, Lu, Yingjie, Liao, Meiyong, Tian, Yongzhi, Liu, Qian, Gao, Chaojun, Yang, Xun, Shan, Chongxin
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 12.12.2019
• Subjects: 3D photodetector; amorphous Ga2O3; Arrays; Dark current; Gallium oxides; Materials science; origami; Photoelectric effect; Photoelectric emission; Photometers; Polyethylene terephthalate; Quantum efficiency; solar‐blind photodetector; Spatial distribution; Substrates
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201906040

A 3D solar‐blind photodetector array is realized from amorphous Ga2O3 films grown on polyethylene terephthalate substrates via an origami route. The photodetector cells exhibit a dark current of 0.17 nA, and the peak responsivity is about 8.9 A W−1 at 250 nm with a quantum efficiency of 4450%. The photodetector shows a distinct cut‐off wavelength at 268 nm with a solar‐blind ratio of more than two orders of magnitude (photocurrent ratio between 250 nm/300 nm). The photodetector cells reveal excellent electrical stability after thousands of bending cycles. All the photodetector cells of the 3D photodetector array have a highly consistent performance. In addition, the device can execute the functions of capturing a real‐time light trajectory and identifying multipoint light spatial distribution, which cannot be achieved in all the previously reported 2D solar‐blind photodetectors. The results suggest new pathways to fabricate 3D photodetectors from conventional semiconductor films, which may find potential applications in optical positioning, tracking, imaging and communications, etc. A 3D solar‐blind photodetector array is realized from amorphous Ga2O3 films grown on polyethylene terephthalate substrates via an origami route. The photodetector cells exhibit high responsivity, good reliability, and high spectral selectivity to solar‐blind ultraviolet irradiation. The device can execute the functions of capturing a real‐time light trajectory and identifying multipoint light spatial distribution.