High-Performance Room-Temperature Terahertz Photodetection Using 2-Dimensional Electron Gas Channel Transport

• DOI: 10.34133/research.0656
• Publication Date: 2025-03-13T16:57:07Z
• Authors: Mengjuan Liu; Yongzhen Li; Ziyang Ren; Yao Wang; Haiming Zhu; Qinxi Qiu; Nasir Ali; He Zhu; Jiaqi Zhu; Weien Lai; Zhiming Huang; Huizhen Wu
• Keywords: Photodetection

Room-temperature (RT) terahertz (THz) detection finds widespread applications in security inspection, communication, biomedical imaging, and scientific research. However, the state-of-the-art strategies are still limited by issues such as low sensitivity, narrow response range, slow speed, complex fabrication techniques, difficulties scaling up to large arrays. Here, we present a high-sensitivity, broadband-response, high-speed RT THz strategy utilizing deep subwavelength metal-semiconductor-metal (MSM) structure. The spontaneously formed 2-dimensional electron gas (2DEG) at CdTe/PbTe interface provides superior transport channel characterized high carrier concentration, scattering, mobility. synergy of electromagnetic induced well effect MSM structure, efficient rapid capabilities 2DEG give rise an impressive performance improvement. proposed photodetector exhibits broad frequency range from 22 519 GHz, ultralow noise equivalent power 3.0 × 10-14 W Hz-1/2 166 short time 6.7 μs. This work effective route for development high-performance strategies, paving way enhanced technology applications.