Journal
ACS APPLIED MATERIALS & INTERFACES
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c11202
Keywords
All inorganic lead-free perovskite; zinc oxide; vertical p-n heterostructure; flexible UV photodetection; visible-blind optoelectronic devices
Funding
- National Natural Science Foundation of China [61405077]
- Research Foundation for Youth Backbone Teacher Training Program of Jiangsu University (China)
- Natural Science Foundation of JiangsuProvince [BK20180862, BK20190839]
- China Postdoctoral Science Foundation [2019M651725]
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In this study, Cs3Cu2I5/ZnO heterostructure flexible photodetectors were successfully constructed using a low-temperature solution method and spin-coating technique. The heterostructure exhibited enhanced light/dark current ratio and ultraviolet-to-visible rejection ratios. The Cs3Cu2I5/ZnO heterostructure shows promising potential for wearable and portable visible-blind ultraviolet optoelectronic devices.
Wearable, portable, and biocompatible optoelectronic devices made of all -green and abundant materials and fabricated by low-temperature solution method are the key point in the development of next generation of intelligent optoelectronics. However, this is usually limited by the weaknesses of mono-component materials, such as non-adjustable photoresponse region, high carrier recombination rate, high signal-to-noise ratio, as well as the weak mechanical flexibility of bulk films. In this work, the Cs3Cu2I5/ZnO heterostructure flexible photodetectors were constructed by a low-temperature solution method combined with spin-coating technique. The heterostructure combines the low dark current and strong deep ultraviolet absorption of Cs(3)Cu(2)I(5 )quantum dots with the high carrier mobility of ZnO quantum dots as well as the efficient charge separation of the vertical p-n junction, to improve the photodetection performance. The heterostructure shows enhanced light/dark current ratio and ultraviolet-to-visible rejection ratios. Under an illumination of 280 nm light, an optical detectivity as high as 1.26 x 10(11 )Jones was obtained; the optical responsivity and response time are much better than those of control devices. After 300 times of 180 degrees bending cycles, the photocurrent had no obvious change. The results demonstrate that the Cs3Cu2I5/ZnO heterostructure has great potential in wearable and portable visible-blind ultraviolet optoelectronic devices.
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