An adjustable multi-color detector based on regulating TiO_(2)surface adsorption and multi-junction synergy  

作　　者：Tao Ji Shuqing He Fujin Ai Jianghong Wu Li Yan Junqing Hu Meiyong Liao 

机构地区：[1]College of Health Science and Environmental Engineering,Shenzhen Technology University,Shenzhen 518118,China [2]Research Center for Functional Materials,National Institute for Materials Science(NIMS),1-1 Namiki,Tsukuba,Ibaraki 305-0044,Japan [3]Shenzhen Bay Laboratory,Shenzhen 518132,China

出　　处：《Nano Research》2021年第10期3423-3430,共8页纳米研究（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.51972055);the Shenzhen Science and Technology Research Project(No.JCYJ20180508152903208);the Guangdong Basic and Applied Basic Research Foundation(No.2020A1515010258);the Stable Support Project for Shenzhen High Education Institutions(No.SZWD2021001);the Shenzhen Bay Laboratory Open Program(No.SZBL2020090501002);the Natural Science Foundation of Top Talent of SZTU(No.20200201);the Homemade Experimental Equipment Foundation of SZTU(No.2020XZY002);the Shenzhen Pengcheng Scholar Program.

摘　　要：A TiO_(2)-based multi-color photodetector with controlled photoelectric response to ultraviolet(UV)and visible light is developed by using band regulation technologies such as multi-junction synergy and surface adsorption.This photodetector is manufactured via a continuous process including magnetron sputtering,hydrothermal growth,hydrogen annealing,spin coating and thermal evaporation assembly to form a structure of N-doped TiO_(2)/hydrogenated-TiO_(2)/p-Si heterojunction.These synergistic effects form electronic potential wells in the device to control the electrical transport and spectral response of photo-generated carriers.In the air,the device exhibits a controllable photodetection ability that responds to visible light at positive voltages and UV light at negative voltages.But in vacuum(<0.1 Pa),the photodetection ability of the device at negative voltages is greatly reduced due to the lack of barrier effect caused by surface adsorption.On the contrary,the photodetection ability at positive voltage(e.g.,4 V)has been greatly improved,and the quantum efficiency reaches 206.6%under the 480 nm wavelength light.The device has a controllable ability to detect UV and visible light depending on the environments,which is very useful in the fields of environmental detection,chemical sensing and multi-color communication,etc.

关 键 词：multi-color detector surface adsorption band adjustment OPTOELECTRONIC 

分 类 号：TN382[电子电信—物理电子学]