High-efficiency AlxGa1-xAs/GaAs cathode for photon-enhanced thermionic emission solar energy converters

被引：31

作者：

Feng, Cheng ^{[1
]}

Zhang, Yijun ^{[1
]}

Qian, Yunsheng ^{[1
]}

Wang, Ziheng ^{[1
]}

Liu, Jian ^{[1
]}

Chang, Benkang ^{[1
]}

Shi, Feng ^{[2
]}

Jiao, Gangcheng ^{[2
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Jiangsu, Peoples R China

[2] Sci & Technol Low Light Level Night Vis Lab, Xian 710065, Shaanxi, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2018年 / 413卷

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

Photon-enhanced thermionic emission; AlxGa1-xAs/GaAs cathode; Graded-composition; Exponential-doping; Conversion efficiency; CELLS; CONVERSION; GAAS; LAYER;

D O I：

10.1016/j.optcom.2017.12.027

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A theoretical emission model for AlxGa1-xAs/GaAs cathode with complex structure based on photon-enhanced thermionic emission is developed by utilizing one-dimensional steady-state continuity equations. The cathode structure comprises a graded-composition AlxGa1-xAs/GaAs window layer and an exponential-doping GaAs absorber layer. In the deduced model, the physical properties changing with the Al composition are taken into consideration. Simulated current-voltage characteristics are presented and some important factors affecting the conversion efficiency are also illustrated. Compared with the graded-composition and uniform-doping cathode structure, and the uniform-composition and uniform-doping cathode structure, the graded-composition and exponential-doping cathode structure can effectively improve the conversion efficiency, which is ascribed to the twofold built-in electric fields. More strikingly, this graded bandgap structure is especially suitable for photon-enhanced thermionic emission devices since a higher conversion efficiency can be achieved at a lower temperature. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1 / 7

页数：7

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