Enhancement of near-infrared response for GaAs-based photocathode with laminated graded-bandgap structure: theory and experiment

doi:10.1016/j.jmrt.2022.05.099

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	Enhancement of near-infrared response for GaAs-based photocathode with laminated graded-bandgap structure: theory and experiment
	Z. H. Wang; Y. J. Zhang; S. M. Li; S. Li; J. J. Zhan; Y. S. Qian; F. Shi; H. C. Cheng; G. C. Jiao and Y. G. Zeng
刊名	Journal of Materials Research and Technology-Jmr&T
	2022
卷号	19 页码:2008-2017
ISSN号	2238-7854
DOI	10.1016/j.jmrt.2022.05.099
英文摘要	To enhance the quantum efficiency of GaAs-based photocathode in the near-infrared range, a laminated graded-bandgap photocathode structure consisting of a distributed Bragg reflection layer and a graded-bandgap emission layer is proposed. The theoretical optical properties and quantum efficiency of this proposed photocathode are simulated based on the finite-different time-domain method and the one-dimensional continuity equations, respectively. The absorptivity at 1064 nm can be significantly increased for the new-type photocathode because of the secondary absorption caused by the distributed Bragg reflection layer. With the improvement of absorptivity at 1064 nm, the quantum efficiency at specific wavelength is enhanced significantly. The contribution of the DBR structure and built-in electric field to the quantum efficiency is theoretical investigated respectively. According to theoretical structure design, the cathode samples grown by epitaxial technique are prepared to verify the theoretical prediction of quantum efficiency enhancement. After the treatment of surface cleaning and Cs/NF3 activation, the experimental results show that the minimum reflectivity at 1064 nm is realized, and the quantum efficiency of the sample with proposed structure is ten times than that of the sample without distributed Bragg reflection layer at 1064 nm. This research provides a guidance for the design of novel photocathode structures with enhanced response at special wavelength. (C) 2022 The Author(s). Published by Elsevier B.V.
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语种	英语
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/66626]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Z. H. Wang,Y. J. Zhang,S. M. Li,et al. Enhancement of near-infrared response for GaAs-based photocathode with laminated graded-bandgap structure: theory and experiment[J]. Journal of Materials Research and Technology-Jmr&T,2022,19:2008-2017.
APA	Z. H. Wang.,Y. J. Zhang.,S. M. Li.,S. Li.,J. J. Zhan.,...&G. C. Jiao and Y. G. Zeng.(2022).Enhancement of near-infrared response for GaAs-based photocathode with laminated graded-bandgap structure: theory and experiment.Journal of Materials Research and Technology-Jmr&T,19,2008-2017.
MLA	Z. H. Wang,et al."Enhancement of near-infrared response for GaAs-based photocathode with laminated graded-bandgap structure: theory and experiment".Journal of Materials Research and Technology-Jmr&T 19(2022):2008-2017.