29 August 2017 Performance stability of reflection-mode AlGaN photocathode under different preparation methods
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To research the attenuation performance of the AlGaN photocathode, three samples with same structures grown by metalorganic chemical vapor deposition (MOCVD) were activated with three different activation methods, which are Cs-only, Cs-O and Cs-O-Cs activation, respectively. The spectral responses and attenuated photocurrents of three AlGaN photocathodes were measured, the result shows that the Cs-O activated AlGaN photocathode have the lowest attenuation speed in the first few hours, the next are Cs-O-Cs and Cs-only activation, respectively. After the Cs-O-Cs activation sample has attenuated 90 min, its attenuation photocurrent curve is coincident with the Cs-O activation sample in the next measurement. The main factor which affects the photocurrent attenuation is Cs atom desorbed from the photocathodes surface.
Conference Presentation
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Guanghui Hao, Junju Zhang, Yijun Zhang, Yafeng Qiu, Yunsheng Qian, "Performance stability of reflection-mode AlGaN photocathode under different preparation methods", Proc. SPIE 10351, UV and Higher Energy Photonics: From Materials to Applications 2017, 1035107 (29 August 2017); doi: 10.1117/12.2273319; https://doi.org/10.1117/12.2273319


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