Ultraviolet irradiation dosimeter based on persistent photoconductivity effect of ZnO  

作　　者：王朝骏 杨珣 臧金浩 陈彦成 林超男 刘忠侠 单崇新 

机构地区：[1]Henan Key Laboratory of Diamond Optoelectronic Materials and Devices,Key Laboratory of Materials Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China [2]Key Laboratory of Materials Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China

出　　处：《Chinese Physics B》2020年第5期561-566,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61804136,U1604263,and U1804155);China Postdoctoral Science Foundation(Grant Nos.2018M630829 and 2019T120630).

摘　　要：It is essential to determine the accumulative ultraviolet(UV)irradiation over a period of time in some cases,such as monitoring UV irradiation to the skin,solar disinfection of water,photoresist exposure,etc.UV colorimetric dosimeters,which use dyes'color change to monitor the amount of UV exposure,have been widely studied.However,the exposure data of these UV colorimetric dosimeters can hardly be converted to digital signals,limiting their applications.In this paper,a UV dosimeter has been proposed and demonstrated based on the persistent photoconductivity(PPC)in zinc oxide microwires(ZnO MWs).The PPC effect usually results in high photoconductivity gain but low response speed,which has been regarded as a disadvantage for photodetectors.However,in this work,the unique characteristics of the PPC effect have been utilized to monitoring the accumulative exposure.We demonstrate that the photocurrent in the ZnO MWs depends on the accumulative UV exposure due to the PPC effect,thus the photocurrent can be utilized to determine the UV accumulation.The dosimeter is immune to visible light and exhibits a photoconductive gain of 2654,and the relative error of the dosimeter is about 10%.This UV dosimeter with electrical output is reusable and convenient to integrate with other electronic devices and may also open a new application area for the PPC effect.

关 键 词：DOSIMETRY persistent photoconductivity photodetectors ultraviolet 

分 类 号：TN23[电子电信—物理电子学] TN15