Highly Sensitive Mid-Infrared Photodetector Enabled by Plasmonic Hot Carriers in the First Atmospheric Window

• 作者: Yuan-Fang Yu Ye Zhang Fan Zhong Lin Bai Hui Liu Jun-Peng Lu Zhen-Hua Ni
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2022,（5）
• 所属期刊栏目: CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
• 页码范围: 186-193
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/0256-307X/39/5/058501

摘要

The first atmospheric window of 3-5 μm in the mid-infrared(MIR)spectral range pertains to crucial appli-cation fields,with particular scientific and technological importance.However,conventional narrow-bandgap semiconductors operating at this band,represented by mercury cadmium telluride and indium antimonide,suffer from limited specific detectivity at room temperature and hindered optoelectronic integration.In this study,a plasmonic hot electron-empowered MIR photodetector based on Al-doped ZnO(AZO)/bi-layer graphene het-erostructure is demonstrated.Free electrons oscillate coherently in AZO disk arrays,resulting in strong localized surface plasmon resonance(LSPR)in the MIR region.The photoelectric conversion efficiency at 3-5 μm is sig-nificantly improved due to plasmon-induced hot-electron extraction and LSPR-enhanced light absorption.The specific detectivity reaches about 1.4×1011 Jones and responsivity is up to 4712.3 A/W at wavelength of 3 μm at room temperature.The device's specific detectivity is among the highest performance of commercial state-of-the-art photodetectors and superior to most of the other 2D materials based photodetectors in the MIR region.These results demonstrate that a plasmonic heavily doped metal oxides/2D material heterostructure is a suitable architecture for constructing highly sensitive room-temperature MIR photodetectors.