Spectroscopy and Spectral Analysis, Volume. 32, Issue 2, 297(2012)
Photoemission Characteristic of Transmission-Mode Extended Blue GaAs Photocathodes
Based on the theoretical models of computing the photocathode optical performance, quantum yield and integral sensitivity, the photoemission characteristics of the domestic and ITT’s transmission-mode extended blue GaAs photocathodes, namely the cathode optical properties and performance parameters, were respectively investigated. The compared results show that the integral sensitivity of the domestic transmission-mode extended blue photocathode has achieved 2 100 μA·lm-1, still falling behind the ITT’s integral sensitivity of 2 750 μA·lm-1. The reasons for the difference in quantum yield curves are that, on one hand, the thickness of GaAlAs window-layer and the Al mole fraction play a critical role in the short-wavelength response, especially in the extended blue region. On the other hand, the cathode performance parameters such as electron diffusion length and back interface recombination velocity work on the long-wavelength and short-wavelength response. All these factors are subject to the backwardness of basic industrial manufacturing level.
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SHI Feng, ZHAO Jing, CHENG Hong-chang, ZHANG Yi-jun, XIONG Ya-juan, CHANG Ben-kang. Photoemission Characteristic of Transmission-Mode Extended Blue GaAs Photocathodes[J]. Spectroscopy and Spectral Analysis, 2012, 32(2): 297
Received: Sep. 25, 2010
Accepted: --
Published Online: Feb. 20, 2012
The Author Email: Feng SHI (shifeng1229@yeah.net)