Activation and evaluation of GaN photocathodes

Yunsheng Qian; Benkang Chang; Jianliang Qiao; Yijun Zhang; Rongguo Fu; Yafeng Qiu

doi:10.1117/12.830153

24 September 2009 Activation and evaluation of GaN photocathodes

Yunsheng Qian, Benkang Chang, Jianliang Qiao, Yijun Zhang, Rongguo Fu, Yafeng Qiu

Proceedings Volume 7481, Electro-Optical and Infrared Systems: Technology and Applications VI; 74810H (2009) https://doi.org/10.1117/12.830153
Event: SPIE Security + Defence, 2009, Berlin, Germany

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.

Citation Download Citation

Yunsheng Qian, Benkang Chang, Jianliang Qiao, Yijun Zhang, Rongguo Fu, and Yafeng Qiu "Activation and evaluation of GaN photocathodes", Proc. SPIE 7481, Electro-Optical and Infrared Systems: Technology and Applications VI, 74810H (24 September 2009); https://doi.org/10.1117/12.830153

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