One-dimensional core/shell radial heterojunction with cascade type-II energyband alignment for enhanced broadband photodetection  

作　　者：Yi Ma Chunxiang Xu Mengyang Wu Fumeng Zhang Xiaoxuan Wang Jianqi Dong Qiannan Cui Zengliang Shi 

机构地区：[1]State Key Laboratory of Digital Medical Engineering,School of Biological Science and Medical Engineering,Southeast University,Nanjing 210096,Jiangsu,China

出　　处：《Light(Advanced Manufacturing)》2024年第3期130-141,共12页光（先进制造）（英文）

基　　金：supported by the National Natural Science Foundation of China NSFC(62075041,62375049,62335003);the Basic Research Program of Jiangsu Province(BK20222007)。

摘　　要：Constructing a one-dimensional(1D)core/shell heterostructure is a rational and efficient way to integrate multiple functional materials into a single device,in which a distinct and reliable interface and suitable energy-band alignment play important roles in optoelectronic applications.Here,using a typical magnetron sputtering system,we constructed a 1D ZnO/CdS/CdTe core/shell nanorod arrays radial heterojunction with a well-designed cascade type-II energy band alignment and improved the broadband photodetector(PD)performance.The well-formed shell layers compensated for the defect states on the ZnO surface and extended the photoresponse range from ultraviolet to visible and near-infrared.Moreover,reliable and distinct heterointerfaces with a cascade type-II energy band alignment can guarantee more stable carrier migration and reduce energy loss,promoting effective photogenerated charge carrier separation and resulting in an enhanced photoresponse.The optimised 1D ZnO/CdS/CdTe core/shell heterojunction PD exhibited a fast photoresponse at 0 V bias with high responsivity and detectivity.These results provide an important reference for the rational design and controllable synthesis of multifunctional optoelectronic nanodevices.

关 键 词：Magnetron sputtering ZnO/CdS/CdTe core/shell Radial heterojunction Type-II energy band Broadband photodetector 

分 类 号：TN2[电子电信—物理电子学] O43[机械工程—光学工程]