2024-03-29T05:48:36Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00031338
2023-01-16T04:24:55Z
673:674:675
Recovery of quantum efficiency on Cs/O-activated GaN and GaAs photocathodes by thermal annealing in vacuum
Sato, Daiki
Nishitani, Tomohiro
Honda, Yoshio
Amano, Hiroshi
open access
Copyright 2020 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Journal of Vacuum Science & Technology B. v.38, n.1, 2020, p.012603) and may be found at (http://dx.doi.org/10.1116/1.5120417).
In this paper, the authors describe the effectiveness of thermal annealing in vacuum for quantum efficiency (QE) recovery from Cs/O-activated GaN and GaAs photocathodes. The QE of Cs/O-activated GaN photocathodes at 3.4 eV dropped from 1.0% to <0.001% upon exposure to nitrogen and then increased to 0.6% upon annealing. On the other hand, the QE of Cs/O-activated GaAs at 1.42 eV did not increase after annealing. In addition, after Cs/O activation, the sample was exposed to normal laboratory air and installed in an X-ray photoemission spectroscopy system. Upon annealing at 330 °C, three key results were confirmed as follows: (1) the work function decreased by 0.32 eV, (2) the chemical states of Cs 4d and Ga 3d were unchanged, and (3) the intensities of O 1s and C 1s on the high-binding-energy side decreased. In conclusion, the experimental results indicate that the annealing recovers the QE of Cs/O-activated GaN photocathode.
AIP Publishing
2020-01
eng
journal article
AM
http://hdl.handle.net/2237/00033518
https://nagoya.repo.nii.ac.jp/records/31338
https://doi.org/10.1116/1.5120417
2166-2746
Journal of Vacuum Science & Technology B
38
1
012603
https://nagoya.repo.nii.ac.jp/record/31338/files/Sato_article.pdf
application/pdf
947.9 kB
2021-02-10