中国物理B ›› 2016, Vol. 25 ›› Issue (4): 48505-048505.doi: 10.1088/1674-1056/25/4/048505

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Comparison of blue-green response between transmission-mode GaAsP-and GaAs-based photocathodes grown by molecular beam epitaxy

Gang-Cheng Jiao(焦岗成), Zheng-Tang Liu(刘正堂), Hui Guo(郭晖), Yi-Jun Zhang(张益军)   

  1. 1 State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
    2 Science and Technology on Low-Light-Level Night Vision Laboratory, Xi'an 710065, China;
    3 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • 收稿日期:2015-11-05 修回日期:2015-12-30 出版日期:2016-04-05 发布日期:2016-04-05
  • 通讯作者: Gang-Cheng Jiao E-mail:jiaogc613@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61301023) and the Science and Technology on Low-Light-Level Night Vision Laboratory Foundation, China (Grant No. BJ2014001).

Comparison of blue-green response between transmission-mode GaAsP-and GaAs-based photocathodes grown by molecular beam epitaxy

Gang-Cheng Jiao(焦岗成)1,2, Zheng-Tang Liu(刘正堂)1, Hui Guo(郭晖)2, Yi-Jun Zhang(张益军)3   

  1. 1 State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
    2 Science and Technology on Low-Light-Level Night Vision Laboratory, Xi'an 710065, China;
    3 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2015-11-05 Revised:2015-12-30 Online:2016-04-05 Published:2016-04-05
  • Contact: Gang-Cheng Jiao E-mail:jiaogc613@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61301023) and the Science and Technology on Low-Light-Level Night Vision Laboratory Foundation, China (Grant No. BJ2014001).

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摘要： In order to develop the photodetector for effective blue-green response, the 18-mm-diameter vacuum image tube combined with the transmission-mode Al0.7Ga0.3As0.9P0.1/GaAs0.9P0.1 photocathode grown by molecular beam epitaxy is tentatively fabricated. A comparison of photoelectric property, spectral characteristic and performance parameter between the transmission-mode GaAsP-based and blue-extended GaAs-based photocathodes shows that the GaAsP-based photocathode possesses better absorption and higher quantum efficiency in the blue-green waveband, combined with a larger surface electron escape probability. Especially, the quantum efficiency at 532 nm for the GaAsP-based photocathode achieves as high as 59%, nearly twice that for the blue-extended GaAs-based one, which would be more conducive to the underwater range-gated imaging based on laser illumination. Moreover, the simulation results show that the favorable blue-green response can be achieved by optimizing the emission-layer thickness in a range of 0.4 μ-0.6 μ.

关键词: GaAsP-based photocathodes, transmission-mode, quantum efficiency, molecular beam epitaxy

Abstract: In order to develop the photodetector for effective blue-green response, the 18-mm-diameter vacuum image tube combined with the transmission-mode Al0.7Ga0.3As0.9P0.1/GaAs0.9P0.1 photocathode grown by molecular beam epitaxy is tentatively fabricated. A comparison of photoelectric property, spectral characteristic and performance parameter between the transmission-mode GaAsP-based and blue-extended GaAs-based photocathodes shows that the GaAsP-based photocathode possesses better absorption and higher quantum efficiency in the blue-green waveband, combined with a larger surface electron escape probability. Especially, the quantum efficiency at 532 nm for the GaAsP-based photocathode achieves as high as 59%, nearly twice that for the blue-extended GaAs-based one, which would be more conducive to the underwater range-gated imaging based on laser illumination. Moreover, the simulation results show that the favorable blue-green response can be achieved by optimizing the emission-layer thickness in a range of 0.4 μ-0.6 μ.

Key words: GaAsP-based photocathodes, transmission-mode, quantum efficiency, molecular beam epitaxy

中图分类号:  (Photomultipliers; phototubes and photocathodes)

  • 85.60.Ha
73.61.Ey (III-V semiconductors) 79.60.-i (Photoemission and photoelectron spectra) 73.40.Kp (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)