Interfacial engineering in WS2/CdSe heterostructures for high-performance broadband photodetection.

IF 3.3 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2025-09-08 DOI:10.1364/OE.572216
Lei Liu, Hui Zhang, Guojie Luo, Desheng Li, Chengsheng Yang, Juan Wang, Changming Liu, Yingkai Liu
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引用次数: 0

Abstract

The optoelectronic performance of two-dimensional transition metal dichalcogenides is fundamentally limited by their weak light absorption at atomic-scale thicknesses. To overcome this challenge, we introduced gold nanoparticles at the van der Waals interface of WS2/CdSe with optimized type-II band alignment. The integrated Au nanoparticles served dual functions. Firstly, the nanoparticles created plasmonic hotspots that amplified localized electric fields via surface plasmon resonance, significantly boosting light absorption and photocurrent generation. Secondly, the nanoparticles formed Schottky contacts that established electron depletion zones and then suppressed dark current. This synergistic approach yielded excellent performance enhancements, including a 339.9× improvement in light-to-dark current ratio and 119.9× higher responsivity (550 nm, 11.57 mW/cm2) compared to the WS2/CdSe control. Comprehensive characterization through scanning Kelvin probe force microscopy and finite-element simulations verified both the band alignment and plasmonic enhancement mechanisms, establishing interfacial engineering as a universal strategy for developing high-performance two-dimensional optoelectronic devices.

用于高性能宽带光探测的WS2/CdSe异质结构界面工程。
二维过渡金属二硫化物的光电性能从根本上受到其在原子尺度厚度上的弱光吸收的限制。为了克服这一挑战,我们在WS2/CdSe的范德华界面上引入了金纳米颗粒,并优化了ii型带对准。集成金纳米颗粒具有双重功能。首先,纳米颗粒产生等离子体热点,通过表面等离子体共振放大局部电场,显著促进光吸收和光电流的产生。其次,纳米颗粒形成肖特基接触,建立电子耗尽区,然后抑制暗电流。与WS2/CdSe相比,这种协同方法产生了出色的性能增强,包括光暗电流比提高339.9倍,响应率提高119.9倍(550 nm, 11.57 mW/cm2)。通过扫描开尔文探针力显微镜和有限元模拟的综合表征验证了带对准和等离子体增强机制,建立了界面工程作为开发高性能二维光电器件的通用策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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