Plasmonic Photoresistor Based on Interconnected Metal‐Semiconductor Grating

材料科学 光探测 等离子体子 光电子学 半导体 栅栏 光伏 沉积(地质) 光电流 光激发 载流子 纳米技术 光学 光电探测器 光伏系统 激发 生态学 古生物学 物理 沉积物 电气工程 生物 工程类
作者
Anik Kumar Ghosh,Swagato Sarkar,T. Tsuda,Soosang Chae,André Knapp,Mirko Nitschke,Amit Das,Sven Wießner,Tobias A. F. König,Andreas Fery
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:33 (23) 被引量:6
标识
DOI:10.1002/adfm.202210172
摘要

Abstract Metal‐semiconductor nanostructures in various configurations are extensively used in photodetection, photocatalysis, and photovoltaics. For photodetection purposes, the working principle is straightforward; on illumination, generated charge carriers in excess lead to a decrease in resistance. Notably, using an interconnected metal‐semiconductor grating, it is observed and now reported an opposite response, an increase in the resistance. Such photoresistors are fabricated through wrinkle structuring and oblique angle material deposition methods. It is found that the controlled wrinkling leads to large‐area 1D periodic structures with coexisting cracking perpendicular to the grating direction—such cracks are used as connections between the two‐point contact measurement through the associated gold layer deposition. An enhanced current reduction is further observed on photoexcitation for an additional deposition of an amorphous titania layer. Subsequently, a discussion on the mechanisms and interaction between hot electron injection, charge carrier recombination, and thermalization is presented. Supported by numerical modeling, the angle‐resolved plasmonic modes with the photoresistance can be correlated. The ease of layered deposition of the materials allows one to extend the studies on cavity‐based structures with sandwiched titania layers as hotspots. This simple, scalable, and robust fabrication method thus promises an efficient routeway toward photosensor development in which plasmon‐mediated hot electrons play a crucial role.
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