基于GaAs/AlxGa1-xAs异质结的量子棘轮太赫兹探测器研究

太赫兹探测在空间探索、生物医疗及国防安全等领域都具有重要的应用前景。高性能太赫兹探测器件对于前沿科学领域的发展有着重要的意义。目前，已有的太赫兹探测器件存在响应速度不够快，覆盖波段不够宽，工位温度低或成本高昂等问题。为弥补现有器件的不足，本项目提出一种基于GaAs/AlxGa1-xAs量子棘轮的电泵浦太赫兹探测器。这种电泵浦的热载流子注入太赫兹探测器具有结构紧凑、高速/宽带响应等先天优势，且与半导体工艺兼容，制备简单。本项目将研究量子棘轮探测器中的太赫兹光电响应物理机制，阐明低温弱信号下棘轮结构中的光吸收和载流子输运机制，深入理解棘轮效应及热载流子注入效应等一系列关键问题，并结合高精度的材料生长和半导体工艺研究，实现高性能器件研制，为高度集成的室温高速太赫兹探测器研究提供新途径。

Terahertz detection has important application prospects in the fields of space exploration, biomedicine, and national defense security. High-performance terahertz detectors are of great significance to the development of frontier scientific fields. At present, the existing terahertz detection devices have problems such as slow re-sponse speed, narrow coverage band, low operation temperature or high cost. In or-der to make up for the shortcomings of existing devices, we proposes a terahertz de-tector based on GaAs/AlxGa1-xAs quantum ratchet in this project. This electrically pumped hot carrier injection terahertz detector has inherent advantages such as compact structure, high-speed/broadband response, etc., is compatible with semiconductor technology, and is simple to prepare. This project will study a series of key problems. Specifically, we will study the physical mechanism of terahertz photoelectric response in quantum ratchet detectors, clarify the mechanism of light absorption and carrier transport in the ratchet structure under low-temperature weak signals, and deeply understand the ratchet effect and hot car-rier injection effects. In addition, we will combine high-precision material growth and semiconductor process research to realize the development of high-performance devices, providing a new way for the research of highly integrated room temperature high-speed terahertz detectors.