Light-induced pyroelectric effect as an effective approach for ultrafast ultraviolet nanosensing

作者：Zhaona Wang, Zhaona Wang, Ruomeng Yu, Caofeng Pan, Zhaoling Li, Yi Fang, Fang Yi, Zhong Lin Wang, Zhong Lin Wang · 发表于：Nature Communications · 年份：2015 · DOI：10.1038/ncomms9401 · 被引用次数：406 · 研究领域：Perovskite Materials and Applications、Gas Sensing Nanomaterials and Sensors、ZnO doping and properties

Zinc oxide is potentially a useful material for ultraviolet detectors; however, a relatively long response time hinders practical implementation. Here by designing and fabricating a self-powered ZnO/perovskite-heterostructured ultraviolet photodetector, the pyroelectric effect, induced in wurtzite ZnO nanowires on ultraviolet illumination, has been utilized as an effective approach for high-performance photon sensing. The response time is improved from 5.4 s to 53 μs at the rising edge, and 8.9 s to 63 μs at the falling edge, with an enhancement of five orders in magnitudes. The specific detectivity and the responsivity are both enhanced by 322%. This work provides a novel design to achieve ultrafast ultraviolet sensing at room temperature via light-self-induced pyroelectric effect. The newly designed ultrafast self-powered ultraviolet nanosensors may find promising applications in ultrafast optics, nonlinear optics, optothermal detections, computational memories and biocompatible optoelectronic probes.