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A Real‐Time Wearable UV‐Radiation Monitor based on a High‐Performance p‐CuZnS/n‐TiO 2 Photodetector
Author(s) -
Xu Xiaojie,
Chen Jiaxin,
Cai Sa,
Long Zhenghao,
Zhang Yong,
Su Longxing,
He Sisi,
Tang Chengqiang,
Liu Peng,
Peng Huisheng,
Fang Xiaosheng
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803165
Subject(s) - wearable computer , photocurrent , responsivity , materials science , optoelectronics , photodetector , ultraviolet , wearable technology , electronics , computer science , embedded system , electrical engineering , engineering
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‐TiO 2 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 × 10 5 %, 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.