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Proceedings Paper

Activation and evaluation of GaN photocathodes
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Paper Abstract

Gallium Nitride (GaN) photocathodes are potentially attractive as UV detective materials and electron sources. Based on the activation and evaluation system for GaAs photocathode, which consists of ultra-high vacuum (UHV) activation chamber, multi-information measurement system, X-ray photoelectron spectroscopy (XPS), and ultraviolet ray photoelectron spectroscopy (UPS), the control and measurement system for the activation of UV photocathodes was developed. The developed system, which consists of Xenon lamp, monochromator with scanner, signal-processing module, power control unit of Cs and O source, A/D adapter, digital I/O card, computer and software, can control the activation of GaN photocathodes and measure on-line the spectral response curves of GaN photocathodes. GaN materials on sapphire substrate were grown by Metal-Organic Chemical Vapor Deposition (MOCVD) with p-type Mg doping. The GaN materials were activated by Cs-O. The spectral response and quantum efficiency (QE) were measured and calculated. The experiment results are discussed.

Paper Details

Date Published: 24 September 2009
PDF: 8 pages
Proc. SPIE 7481, Electro-Optical and Infrared Systems: Technology and Applications VI, 74810H (24 September 2009); doi: 10.1117/12.830153
Show Author Affiliations
Yunsheng Qian, Nanjing Univ. of Science & Technology (China)
Benkang Chang, Nanjing Univ. of Science & Technology (China)
Jianliang Qiao, Nanjing Univ. of Science & Technology (China)
Yijun Zhang, Nanjing Univ. of Science & Technology (China)
Rongguo Fu, Nanjing Univ. of Science & Technology (China)
Yafeng Qiu, Nanjing Univ. of Science & Technology (China)


Published in SPIE Proceedings Vol. 7481:
Electro-Optical and Infrared Systems: Technology and Applications VI
David A. Huckridge; Reinhard R. Ebert, Editor(s)

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