反射式GaAs光电阴极的热增强光电发射能量转换理论研究  

Thermally Enhanced Photoelectric Emission of Reflection-Mode GaAs Photocathode for Solar Energy Conversion: A Theoretical and Experimental Study

作　　者：王贵圆 富容国[1] 杨明珠 石峰 程宏昌 常本康[1] Wang Guiyuan;Fu Rongguo;Yang Mingzhu;Shi Feng;Cheng Hongchang;Chang Benkang(Department of Electronic Engineering and Optoelectronic Technology,Nanjing University of Science and Technology,Nanjing 210094,China;School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;The Key Laboratory on Night Vision Technology,Xi＇ an 710065,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094 [2]南京信息工程大学物理与光电工程学院,南京210044 [3]微光夜视即使重点实验室,西安710065

出　　处：《真空科学与技术学报》2018年第9期779-785,共7页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(编号:91433108;61705108);江苏省青年自然科学基金项目(编号:BK20170959);江苏省研究生培养创新工程(编号:KYZZ16_0178)

摘　　要：热增强光电发射是一种新的太阳能转换技术,它可以将光电发射和热电发射结合到一个过程中。本文在细节平衡条件下对光子增强热电子发射进行了理论计算,并给出了反射式GaAs光电阴极的增强热电子发射电流密度和能量转换效率。计算结果表明,阴极的电子亲和势增高会降低发射电流密度,提高输出电压,影响能量转换效率。当电子亲和势为负时,平台期能量转换效率约为15%,当电子亲和势为正时,能量转换效率可以超过25%。实验测得反射式GaAlAs/GaAs真空光电二极管的光电发射过程随温度提高而增强,在短波段更为明显。若以低功函数金刚石薄膜为阳极,可计算其能量转换效率约为2.7%,并随温度提高而略有提升。Thermally enhanced photoelectric emission（ TEPE） from reflection-mode GaAs photocathode,a new technique for solar-energy conversion,was mathematically modeled,theoretically analyzed,numerically simulated and experimentally evaluated. The influence of the cathode＇s surface electron affinity on the energy conversion efficiency was investigated. The results show that the surface affinity has a major impact. For example,an increasing positive affinity reduces the emission current density and increases the output voltage,affecting the conversion efficiency. The calculated conversion efficiencies,for the negative and positive cathode surface electron affinity,were 15% and over 25%,respectively. As shown in the measurements,an increase of temperature significantly enhanced the spectral sensitivity of reflection-mode GaAlAs/GaAs photodiode,especially in short-wave band. A low work function anode,such as a P-doped diamond film,may result in a conversion efficiency of 2. 7%,slightly increasing with a rise-up of temperature.

关 键 词：热增强光电发射 光子增强热电子发射 反射式GaAs阴极 太阳能转换 

分 类 号：O462.3[理学—电子物理学]