可穿戴计算机
光电流
响应度
材料科学
光电子学
光电探测器
紫外线
可穿戴技术
数码产品
计算机科学
嵌入式系统
电气工程
工程类
作者
Xiaojie Xu,Jiaxin Chen,Sa Cai,Zhenghao Long,Zhang Yong,Longxing Su,Sisi He,Chengqiang Tang,Peng Liu,Huisheng Peng,Xiaosheng Fang
标识
DOI:10.1002/adma.201803165
摘要
Solar radiation, especially ultraviolet (UV) light, is a major hazard for most skin-related cancers. The growing needs for wearable health monitoring systems call for a high-performance real-time UV sensor to prevent skin diseases caused by excess UV exposure. To this end, here a novel self-powered p-CuZnS/n-TiO2 UV photodetector (PD) with high performance is successfully developed (responsivity of 2.54 mA W-1 at 0 V toward 300 nm). Moreover, by effectively replacing the Ti foil with a thin Ti wire for the anodization process, the conventional planar rigid device is artfully turned into a fiber-shaped flexible and wearable one. The fiber-shaped device shows an outstanding responsivity of 640 A W-1 , external quantum efficiency of 2.3 × 105 %, and photocurrent of ≈4 mA at 3 V, exceeding those of most current UV PDs. Its ultrahigh photocurrent enables it to be easily integrated with commercial electronics to function as a real-time monitor system. Thus, the first real-time wearable UV radiation sensor that reads out ambient UV power density and transmits data to smart phones via wifi is demonstrated. This work not only presents a promising wearable health monitor, but also provides a general strategy for designing and fabricating smart wearable electronic devices.
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