Affiliation:
1. Department of Intelligent Manufacturing and Equipment Institute of Smart City and Intelligent Transportation Southwest Jiaotong University Chengdu Sichuan 611756 P. R. China
2. State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu Sichuan 610054 P. R. China
3. Tribology Research Institute State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu Sichuan 610031 P. R. China
Abstract
Abstract2D layered semiconductor materials hold the potential to address the crucial technical challenges of poor signal uniformity and low repeatability of traditional metal plasmonic nanostructures in sensing, which hinder quantitative detection and analysis in molecular detection. However, the ultra‐low light absorption efficiency and electronic state density intrinsically result in their inferior sensitivity compared with those of conventional metal plasmonic nanostructures. Therefore, the integration of the classical back‐gate modulation strategy and surface plasmon resonance into 2D heterostructures is proposed. This integration aims to control the interaction between the surface sensing material of the heterostructure and target molecules from the perspective of surface electronic state density and optical absorption efficiency. The sensitivity (≈10−12 m) of as‐designed MoS2/graphene/Ag heterojunction is comparable to that of advanced metal plasmonic nanostructures, and the corresponding enhancement factor (EF, 1.71 × 104) is much higher than that of most heterojunction‐based and metal‐semiconductor coupled devices. This study uncovers the internal mechanism of the surface plasmon effect and high electronic state density in enhancing light‐matter interactions, and provides an alternative avenue for high‐performance surface‐enhanced devices.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Southwest Jiaotong University
Sichuan Province Science and Technology Support Program
Subject
Electronic, Optical and Magnetic Materials