Change of the surface potential barrier of GaAs photocathode during two-step activation

Jun Niu; Youtang Gao; Yunsheng Qian; Benkang Chang

doi:10.1117/12.2071195

2 September 2014 Change of the surface potential barrier of GaAs photocathode during two-step activation

Jun Niu, Youtang Gao, Yunsheng Qian, Benkang Chang

Proceedings Volume 9284, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronics Materials and Devices for Sensing and Imaging; 92840T (2014) https://doi.org/10.1117/12.2071195
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

High and low temperature activation experiments were carried out for a transmission-mode GaAs photocathode sample, and the activation photocurrent curves were recorded. The variety of the activation photocurrent curves between high and low temperatures was studied. By using fitting calculation, the surface potential barrier parameters of NEA photocathode after high and low temperature activations were obtained, respectively, and the change of the surface potential barriers between high and low -temperature activations is indicated. Besides, The NEA cathode surface after high-temperature activation and low temperature activation were analyzed respectively by using angle-dependent X-ray photoelectron spectroscopy (XPS). Above investigation results indicate that, with contrast to high-temperature activation, the thickness of surface potential barriers after low-temperature activation become thin and the vacuum level is reduced further. As a result, the cathode spectral sensitivity is improved remarkably.

Citation Download Citation

Jun Niu, Youtang Gao, Yunsheng Qian, and Benkang Chang "Change of the surface potential barrier of GaAs photocathode during two-step activation", Proc. SPIE 9284, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronics Materials and Devices for Sensing and Imaging, 92840T (2 September 2014); https://doi.org/10.1117/12.2071195

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