Self-Powered Wavelength-Dependent Dual-Polarity Response Photodetector Based on CdS@PEDOT:PSS@Au Sandwich-Structured Core–Shell Nanorod Arrays,ACS Applied Materials & Interfaces

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Self-Powered Wavelength-Dependent Dual-Polarity Response Photodetector Based on CdS@PEDOT:PSS@Au Sandwich-Structured Core–Shell Nanorod Arrays
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-21 , DOI: 10.1021/acsami.3c07869
Boyong Zhang ₁ , Wei Zhai ₁ , Jianyuan Wang ₁

Affiliation

Self-powered operation and multifunctionality have significantly oriented the development of photodetectors (PDs), which could be realized through nanoarchitecture construction and energy band structure design. Herein, a self-powered wavelength-dependent dual-polarity response PD based on (CdS@PEDOT:PSS@Au) sandwich-structured core–shell nanorod arrays (NRAs) is proposed. The synthesis approach of this three-layer heterostructure consists of a hydrothermal reaction, spin coating, and thermal evaporation. The n-CdS/p-PEDOT:PSS junction and the PEDOT:PSS/Au Schottky junction at the interfaces provide two photocurrent driving forces in opposite directions, and their contribution to the net photocurrent is controlled by the incident light wavelength due to the different light absorption ranges of the CdS core and the PEDOT:PSS shell. As a result, the polarity of the photocurrent switches from negative to positive as the wavelength increases. In addition, the response speed of negative photocurrents (∼10 ms) is faster than that of positive photocurrents (∼100 ms), which is consistent with the underlying mechanism of the dual-polarity response. Furthermore, color discrimination and imaging capabilities are demonstrated by deploying the PDs as sensing pixels and recognizing green and red patterns. The sandwich-structured core–shell NRA heterojunction system introduces a novel idea for dual-polarity response PDs.

中文翻译：

基于CdS@PEDOT:PSS@Au三明治结构核壳纳米棒阵列的自供电波长相关双极性响应光电探测器

自供电操作和多功能性极大地引导了光电探测器（PD）的发展，这可以通过纳米结构构造和能带结构设计来实现。在此，提出了一种基于（CdS@PEDOT:PSS@Au）三明治结构核壳纳米棒阵列（NRA）的自供电波长相关双极性响应PD。这种三层异质结构的合成方法包括水热反应、旋涂和热蒸发。界面处的n - CdS/ p -PEDOT:PSS结和PEDOT:PSS/Au肖特基结提供两个方向相反的光电流驱动力，由于不同的入射光波长，它们对净光电流的贡献受到入射光波长的控制。 CdS 核和 PEDOT:PSS 壳的光吸收范围。结果，随着波长的增加，光电流的极性从负变为正。此外，负光电流（∼10 ms）的响应速度比正光电流（∼100 ms）更快，这与双极性响应的基本机制一致。此外，通过将 PD 部署为传感像素并识别绿色和红色图案，展示了色彩辨别和成像功能。三明治结构的核壳NRA异质结系统引入了双极性响应PD的新思路。

更新日期：2023-09-21

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