title: Comparison of structure and performance between extended blue and standard transmission-mode GaAs photocathode modules.
abstract: Extended blue and standard transmission-mode GaAs photocathode modules were prepared, respectively, by metal organic chemical vapor deposition. The experimental reflectivity, transmissivity, and spectral response curves were measured and compared separately. The integral sensitivities are 1980 μA/lm and 2022 μA/lm for both the modules. By use of the revised quantum yield formula, the experimental spectral response curves are fitted to obtain the structure parameters. The fitted results show that the Ga(1-x)Al(x)As window layer with varied aluminum components is beneficial to improve extended blue GaAs photocathode module. In addition, the layer-thickness and aluminum component in the window layer determine the extended blue performance, while the thickness of the GaAs active layer settles the long-waveband performance for the transmission-mode GaAs photocathode module.
authors.affiliation: Institute of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing, China. zhaojing7319@yahoo.cn
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Yijun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Benkang
authors.initials: B
authors.lastname: Chang
authors.forename: Junju
authors.initials: J
authors.lastname: Zhang
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Xiong
authors.forename: Feng
authors.initials: F
authors.lastname: Shi
authors.forename: Hongchang
authors.initials: H
authors.lastname: Cheng
authors.forename: Dongxu
authors.initials: D
authors.lastname: Cui