本项目针对目前太阳能电池转换效率低的问题，提出以变组分变掺杂GaAlAs/GaAs光电转换材料为核心的高效真空光电转换器件。利用第一性原理研究变组分变掺杂光电转换材料能带结构的形状和大小，并研究不同掺杂浓度区域交界面处耗尽层的宽度、内建电场的大小及对电子运动规律的影响，建立变组分变掺杂光电转换材料的量子效率模型，并进行变组分变掺杂光电转换材料研制。研制与光电转换材料相匹配的、能有效地收集光电子的阳极。研制阳极辅热Cs循环装置，保证光电转换材料的NEA性能。基于真空光电器件的研究，构建含光学聚光装置、变组分变掺杂GaAlAs/GaAs光电转换材料、阳极、辅热Cs循环装置和蓄电池系统组成的NEA GaAs基高效真空光电转换系统，最终获得大于40%的光电转换效率。

In view of the low conversion efficiency of solar cell, this project provides theefficient vacuum photo-electric transfer device, which is based on the compositional graded and doping graded GaAlAs/GaAs photoelectric conversion material. By using the first-principles, the shape and size of the energy band structure of the compositional graded and doping graded photoelectric conversion material are studied, and the effects of the depletion layer width and the built-in electric field size at the interface of different doping concentration regions on the electron movement are also studied. The quantum efficiency model of the compositional graded and doping graded photoelectric conversion material would be built, which guides the design of photoelectric conversion material. An anode effectively collecting the electrons emitting from photoelectric conversion material is developed. In order to ensure the NEA capability of photoelectric conversion material, a heat-assistant Cs circulate device on the anode side is developed. Based on the study of vacuum photo-electric transfer device, the vacuum photo-electric transfer system possessing more than 40% photoelectric conversion efficiency would be built, which consists of optical focusing device, compositional graded and doping graded GaAlAs/GaAs photoelectric conversion material, anode, heat-assistant Cs circulate device, and battery system.