Effect of graded bandgap structure on photoelectric performance of transmission-mode AlxGa1-xAs/GaAs photocathode modules

Feng Cheng; Zhang Yijun; Liu Jian; Qian Yunsheng; Liu Xinxin; Shi Feng; Cheng Hongchang

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Effect of graded bandgap structure on photoelectric performance of transmission-mode AlxGa1-xAs/GaAs photocathode modules

机译：分级带隙结构对透射模式ALXGA1-XAS / GAAS光电阴极模块的光电性能的影响

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The graded bandgap AlxGa1-xAs/GaAs photocathode with graded composition and exponential doping structure has shown great potential for improving photoemission capability. In order to better study the performance of transmission-mode AlxGa1-xAs/GaAs photocathode with the complex graded bandgap structure, the experimental optical properties and quantum efficiency are measured by comparison with uniform composition and exponential doping Al0.7Ga0.3As/GaAs photocathode. The theoretical optical properties of the multilayer AlxGa1-xAs/GaAs photocathode modules are calculated by matrix formula on the basis of thin-film optical principles. The effect of cathode thickness and aluminum proportion on optical properties are analyzed by simulation. The results show that these parameters have complicated effects on the optical properties. Different parameters are presented as the changes of peak and valley of the optical property curves. Meanwhile, the emission layer has a significant effect on the absorptivity values of the photocathode modules, which will obviously influence photoemission performance. By using the optical properties via calculation, a better fit of the experimental data with the theoretical model can be achieved, which would make reasonable guidance for further investigation of these complex graded bandgap photoemitters. (C) 2017 Optical Society of America

机译：具有分级组成和指数掺杂结构的分级带隙AlxGa1-XAS / GaAS光电阴极显示出改善光曝光能力的巨大潜力。为了更好地研究具有复分级带隙结构的透射模式Alxga1-XAS / GaAs光电阴极的性能，通过与均匀的组合物和指数掺杂Al0.7Ga0.3As / GaAs光电阴极进行比较来测量实验光学性质和量子效率。通过基于薄膜光学原理，通过矩阵公式计算多层ALXGA1-XAS / GaAs光电阴极模块的理论光学性质。通过模拟分析阴极厚度和铝比例对光学性质的影响。结果表明，这些参数对光学性质具有复杂的影响。将不同的参数呈现为光学性能曲线的峰值和谷的变化。同时，发光层对光电阴极模块的吸收值具有显着影响，这显然会影响光曝光性能。通过计算光学性质，可以实现与理论模型的实验数据更好的实验数据，这将为进一步调查这些复分级带隙摄影器来做出合理的指导。（c）2017年光学学会

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来源
《Applied optics》 |2017年第32期|共6页
作者
Feng Cheng; Zhang Yijun; Liu Jian; Qian Yunsheng; Liu Xinxin; Shi Feng; Cheng Hongchang;
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作者单位

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Sch Elect &

Opt Engn Nanjing 210094 Jiangsu Peoples R China;

Sci &

Technol Low Light Level Night Vis Lab Xian 710065 Shaanxi Peoples R China;

Sci &

Technol Low Light Level Night Vis Lab Xian 710065 Shaanxi Peoples R China;

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Effect of graded bandgap structure on photoelectric performance of transmission-mode AlxGa1-xAs/GaAs photocathode modules

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