Ultra-sensitive flexible Ga_(2)O_(3)solar-blind photodetector array realized via ultra-thin absorbing medium  

作　　者：Yancheng Chen Xun Yang Yuan Zhang Xuexia Chen Junlu Sun Zhiyang Xu Kaiyong Li Lin Dong Chongxin Shan 

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

出　　处：《Nano Research》2022年第4期3711-3719,共9页纳米研究（英文版）

基　　金：This work was financially supported by the National Key Research and Development Program of China(No.2018YFB0406500);the National Natural Science Foundation of China(Nos.61804136,U1804155,and 62027816);China Postdoctoral Science Foundation(Nos.2018M630829 and 2019T120630).

摘　　要：The quest for solar-blind photodetectors with outstanding optoelectronic properties and weak signals detection capability is essential for their applications in the field of imaging,communication,warning,etc.To date,Ga_(2)O_(3)has demonstrated potential for high-performance solar-blind photodetectors.However,the performance usually decays superlinearly at low light intensities due to carrier-trapping effect,which limits the weak signal detection capability of Ga_(2)O_(3)photodetectors.Herein,a Ga_(2)O_(3)solarblind photodetector with ultra-thin absorbing medium has been designed to restrain trapping of photo-generated carriers during the transporting process by shortening the carrier transport distance.Meanwhile,multiple-beam interference is employed to enhance the absorption efficiency of the Ga_(2)O_(3)layer using an Al/Al_(2)O_(3)/Ga_(2)O_(3)structure.Based on the ultra-thin absorbing medium with enhanced absorption efficiency,a 7×7 flexible photodetector array is developed,and the detectivity can reach 1.7×10^(15)Jones,which is among the best values ever reported for Ga_(2)O_(3)photodetectors.Notably,the performance of the photodetector decays little as the illumination intensity is as weak as 5 nW/cm2,revealing the capacity to detect ultra-weak signals.In addition,the flexible photodetector array can execute the functions of imaging,spatial distribution of light source intensity,real-time light trajectory detection,etc.Our results may provide a route to high-performance solar-blind photodetectors for ultra-weak light detection.

关 键 词：Ga_(2)O_(3) solar-blind detection ultra-thin absorbing medium multiple-beam interference flexible array 

分 类 号：TN382[电子电信—物理电子学]