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

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

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, usi...

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Bibliographic Details
Main Authors: Yi Ma, Chunxiang Xu, Mengyang Wu, Fumeng Zhang, Xiaoxuan Wang, Jianqi Dong, Qiannan Cui, Zengliang Shi
Format: Article
Language:English
Published: Light Publishing Group 2024-09-01
Series:Light: Advanced Manufacturing
Subjects:
magnetron sputtering
zno/cds/cdte core/shell
radial heterojunction
type-ii energy band
broadband photodetector
Online Access:https://www.light-am.com/article/doi/10.37188/lam.2024.040
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Summary: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.
ISSN:2689-9620

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