通过无滤波器可见光通信的热光子效应改进双极性响应,Small

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通过无滤波器可见光通信的热光子效应改进双极性响应
Small ( IF 13.0 ) Pub Date : 2023-03-10 , DOI: 10.1002/smll.202207718
Boyong Zhang ₁ , Yu Chang ₁ , Zhuokun Han ₁ , Wencan Wang ₁ , Bingcheng Luo ₁ , Wei Zhai ₁ , Jianyuan Wang ₁

Affiliation

双极性响应光电探测器 (PD) 充分利用光电流的方向性来识别光学信息。首次提出双极性信号比这一表示对不同光响应均衡程度的关键参数。双极性光电流的同步增强和双极性信号比的改善有利于实际应用。在此，基于选择性光吸收和能带结构设计，由 pn 结和肖特基结组成的自供电 CdS/PEDOT:PSS/Au 异质结 PD 表现出独特的波长相关双极性响应，其中光电流为分别在短波长和长波长区域为负和正。更重要的是，CdS 层内的热解光子效应显着提高了双极性光电流，在 405、450、532、650 和 808 nm 处的最大增强因子分别为 120%、343%、1167%、1577% 和 1896%，分别。此外，由于不同程度的增强，双极性信号比趋于1:1。这项工作为双极性响应 PD 提供了一种新颖的设计策略，具有简单的工作原理和改进的性能，可以替代无滤波器可见光通信 (VLC) 系统中的两个传统 PD。1 由于增强程度不同。这项工作为双极性响应 PD 提供了一种新颖的设计策略，具有简单的工作原理和改进的性能，可以替代无滤波器可见光通信 (VLC) 系统中的两个传统 PD。1 由于增强程度不同。这项工作为双极性响应 PD 提供了一种新颖的设计策略，具有简单的工作原理和改进的性能，可以替代无滤波器可见光通信 (VLC) 系统中的两个传统 PD。

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Improved Dual-Polarity Response via Pyro-phototronic Effect for Filterless Visible Light Communication

Dual-polarity response photodetectors (PDs) take full advantage of the directivity of the photocurrent to identify optical information. The dual-polarity signal ratio, a key parameter that represents the equilibrium degree of responses to different lights, is proposed for the first time. The synchronous enhancement of dual-polarity photocurrents and the amelioration of the dual-polarity signal ratio are beneficial to the practical applications. Herein, based on the selective light absorption and energy band structure design, a self-powered CdS/PEDOT:PSS/Au heterojunction PD consisting of a p-n junction and a Schottky junction exhibits unique wavelength-dependent dual-polarity response, where the photocurrent is negative and positive in the short and long wavelength regions, respectively. More importantly, the pyro-phototronic effect inside the CdS layer significantly improves the dual-polarity photocurrents with the maximum enhancement factors of 120%, 343%, 1167%, 1577%, and 1896% at 405, 450, 532, 650, and 808 nm, respectively. Furthermore, the dual-polarity signal ratio tends to 1:1 due to different degrees of the enhancement. This work provides a novel design strategy for dual-polarity response PDs with a simple working principle and improved performance, which can supply a substitution for two traditional PDs in the filterless visible light communication (VLC) system.

更新日期：2023-03-10

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