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Proceedings Paper

Photoemission performance of gradient-doping transmission-mode GaAs photocathodes
Author(s): Yijun Zhang; Jun Niu; Jijun Zou; Yajuan Xiong; Benkang Chang; Junju Zhang; Yujie Du
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Paper Abstract

With an attempt to improve the photoelectron emission efficiency, a gradient-doping structure proposed based on the Spicer's three-step model has been applied to the preparation of the transmission-mode GaAs photocathode via molecular beam epitaxy technique. The Cs-O activation phenomenon suggests that the gradient-doping structure can bring a potential photoemission capability with the increase of activation time, and the spectral response curves show that the gradient-doping photocathode can obtain a higher response capability in the entire waveband region, especially in the regions of short-wavelength threshold and long-wavelength threshold. By fitting quantum yield curves, the obtained cathode performance parameters such as electron average diffusion length and electron escape probability of the gradient-doping photocathode are greater than those of the uniform-doping one. The electron average diffusion length of the gradient-doping photocathode achieves 3.2 μm. The improvement in cathode performance of the gradient-doping photocathode could be ascribed to the downward gradient band-bending structure.

Paper Details

Date Published: 18 August 2011
PDF: 7 pages
Proc. SPIE 8194, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, 81940N (18 August 2011); doi: 10.1117/12.898952
Show Author Affiliations
Yijun Zhang, Nanjing Univ. of Science & Technology (China)
Jun Niu, Nanjing Univ. of Science & Technology (China)
Nanyang Institute of Technology (China)
Jijun Zou, Nanjing Univ. of Science & Technology (China)
Yajuan Xiong, Nanjing Univ. of Science & Technology (China)
Benkang Chang, Nanjing Univ. of Science & Technology (China)
Junju Zhang, Nanjing Univ. of Science & Technology (China)
Yujie Du, Nanjing Univ. of Science & Technology (China)


Published in SPIE Proceedings Vol. 8194:
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications
Makoto Ikeda; Nanjian Wu; Guangjun Zhang; Kecong Ai, Editor(s)

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