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19 November 2007 Activation experiments and quantum efficiency theory on gradient-doping NEA GaAs photocathodes
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Proceedings Volume 6782, Optoelectronic Materials and Devices II; 67822R (2007)
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
Two gradient-doping GaAs photocathodes were designed and activated, the achieved highest integral sensitivity for the gradient-doping cathode is 2178μA/lm, which is much higher than that of uniform-doping cathode. The increase in the integral sensitivity is attributed to the electric field induced in the active layer of gradient-doping cathode. We analyze the transported mechanism of gradient-doping cathodes and solve the quantum efficiency equations of exponential-doping cathode, which is a special gradient-doping cathode with a constant induced electric field, from the one-dimensional continuity equations. According to these equations, we calculate the theoretical quantum yield of the exponential-doping cathodes, and compare the performance of exponential-doping cathodes with that of uniform-doping cathodes. The theoretical results show that the exponential-doping structure can increase the quantum yield of photocathodes evidently, for the transmission-mode cathodes the increase is even more pronounced.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jijun Zou, Zhi Yang, Jianliang Qiao, Pin Gao, and Benkang Chang "Activation experiments and quantum efficiency theory on gradient-doping NEA GaAs photocathodes", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67822R (19 November 2007);

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