指数掺杂GaAs阴极光子增强热电子发射型太阳能转换器转化效率理论计算(英文)  

Conversion Efficiency of Photon Enhanced Thermionic Emission Solar Converters with Exponential Doping GaAs Cathodes

作　　者：唐伟东[1,2] 杨文正[1] 杨阳[1] 孙传东[1] 蔡志鹏[1,2] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院大学,北京100049

出　　处：《光子学报》2014年第6期143-148,共6页Acta Photonica Sinica

基　　金：The Knowledge Innovation Project of Chinese Academy of Sciences(No.KGCX2-YW-399+10);the West Light Foundation of Chinese Academy of Sciences

摘　　要：光子增强热电子发射型太阳能转换器是一种理论效率极高的新型太阳能利用技术.提出利用指数掺杂GaAs材料作为光子增强热电子发射型太阳能转换器阴极,基于能量守恒及电子扩散漂移发射模型,理论计算了指数掺杂GaAs阴极光子增强热电子发射型太阳能转化器的转化效率.结果表明:指数掺杂GaAs可以显著提高光子增强热电子发射效率;指数掺杂GaAs光子增强热电子太阳能转化器转化效率随聚光倍数的增加和阴极表面电子复合速率减小而单调上升;当太阳基数大于200、阴极表面复合小于104 cm/s时,指数掺杂GaAs阴极光子增强热电子发射型太阳能转换器效率可达30%.Photon-enhanced thermionic emission solar energy converter is a new highly efficient solar energy utilization technologies. An exponential doping GaAs material was presented as the cathode of photon-enhanced thermionic emission solar converter. The conversion efficiencies of the photon- enhanced thermionic emission solar devices with exponential doping GaAs were theoretically analyzed by using the energy-balance and diffusion-drift-emission models. The results show that exponential doping GaAs prominently enhances photon-enhanced thermionic emission conversion, and the efficiency of photon-enhanced thermionic emission solar converters with exponential doping GaAs cathodes is a monotonically increasing function of sun concentration and a monotonically decreasing function of cathode surface recombination velocities. The efficiency of the converter can reach 30 at a flux concentration larger than 200 suns and surface recombination velocities maintained at fewer than 10^4 cm/s.

关 键 词：PETE 太阳能转化器 指数掺杂 GaAs阴极 转化效率 

分 类 号：TK514[动力工程及工程热物理—热能工程]