现代微光夜视器件正朝着高灵敏度、宽光谱响应的方向发展，为了提高微光夜视器件在沙漠地带或者海洋环境中景物的探测、识别和确认的能力，有必要进一步提高光电阴极在蓝绿光波段透光窗口的响应。本项目拟开展蓝延伸指数掺杂GaAlAs/GaAs光电阴极制备及其理论研究，通过建立正确合理的蓝延伸指数掺杂GaAlAs/GaAs光电阴极量子效率模型，从能带结构、光学性能、量子效率等多方面综合考虑优化设计蓝延伸指数掺杂GaAlAs/GaAs光电阴极结构，再通过材料性能表征和阴极激活实验比较MOCVD和MBE生长的蓝延伸指数掺杂GaAlAs/GaAs光电阴极制备工艺和光电发射性能的差异，从而为提高透射式GaAlAs/GaAs光电阴极的蓝延伸效果提供理论指导和实验依据。蓝延伸指数掺杂GaAlAs/GaAs光电阴极在海洋探测、高能物理、天文观测等领域具有很好的应用前景。

Modern low-light-level night vision device is developed toward the features of high sensitivity and broadband spectral response, and the ability of detection, recognition and identification of targets in the desert terrain or marine environment is to be strengthened, therefore, the response in the blue-green waveband region serving as a transparent window should be improved. In this project, we will investigate the preparation and photoemission theory of blue-extended exponential-doping GaAlAs/GaAs photocathodes. Firstly, a proper and reasonable quantum efficiency model of the blue-extended exponential-doping GaAlAs/GaAs photocathode will be established. Then the structure of the blue-extended exponential-doping GaAlAs/GaAs photocathode will be optimized through overall consideration of band structure, optical property and quantum efficiency etc. Lastly, by the aid of cathode materials characterization and activation experiment, the discrepancy in the preparation craft and photoemission performance of the blue-extended exponential-doping GaAlAs/GaAs photocathodes grown by MOCVD and MBE will be investigated. Based on the above research results, we will provide theoretical guidance and experimental basis for the improvement of blue-extended effect of transmission-mode GaAlAs/GaAs photocathodes. Blue-extended exponential-doping GaAlAs/GaAs photocathodes have great potential for applications in the fields of marine exploration, high-energy physics and astronomy observations etc.