| アイテムタイプ |
itemtype_ver1(1) |
| 公開日 |
2026-02-26 |
| タイトル |
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タイトル |
Comparative study of quantum efficiency for InGaN photocathodes using various alkali metals |
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言語 |
en |
| 著者 |
Idei, Mikiya
Koizumi, Atsushi
Sato, Daiki
Nishitani, Tomohiro
Honda, Yoshio
Amano, Hiroshi
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| アクセス権 |
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アクセス権 |
embargoed access |
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アクセス権URI |
http://purl.org/coar/access_right/c_f1cf |
| 権利 |
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権利情報 |
Copyright 2026 Author(s). Published under an exclusive license by AIP Publishing. 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 (J. Vac. Sci. Technol. B 44, 012201 (2026)) and may be found at (https://doi.org/10.1116/6.0005129). |
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言語 |
en |
| 内容記述 |
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内容記述タイプ |
Abstract |
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内容記述 |
This study investigated the influence of various alkali metal coatings on the quantum efficiency (QE) characteristics and durability of InGaN photocathodes. The InGaN semiconductor crystal was grown on sapphire substrates using the metal-organic vapor-phase epitaxy method. InGaN photocathodes were fabricated by coating the InGaN surface following heat cleaning in ultrahigh vacuum with Li, Na, K, Rb, and Cs using two methods: the single-alkali metal coating (SAC) method, where only the alkali metal was coated, and the Yo-Yo method, where the alkali metal and oxygen were coated alternately. A negative correlation was observed between the work function of each alkali metal and QE for InGaN photocathodes coated by both the SAC and Yo-Yo methods. For Na, K, Rb, and Cs coatings for both the SAC and Yo-Yo methods, the excitation photon energy dependence of QE showed a threshold near the InGaN bandgap energy. In the excitation power density dependence of QE, the QE reduced exponentially with increasing excitation light power density in the range of 10^−1 – 10^5 W/cm2. Furthermore, in the durability evaluation, a trend of improved durability with increasing atomic mass of each alkali metal was observed. The durability of the InGaN photocathode with coating Cs/O showed the best performance. In contrast, when Li was used in both the SAC and Yo-Yo methods, the QE was approximately 1 order of magnitude lower than the other alkali metals, and it remained nearly constant regardless of the excitation light power density dependence of QE. |
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言語 |
en |
| 出版者 |
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出版者 |
AIP Publishing |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプresource |
http://purl.org/coar/resource_type/c_6501 |
|
タイプ |
journal article |
| 出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 関連情報 |
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関連タイプ |
isVersionOf |
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識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1116/6.0005129 |
| 収録物識別子 |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
2166-2746 |
| 書誌情報 |
en : Journal of Vacuum Science and Technology B
巻 44,
号 1,
p. 012201,
発行日 2026-01
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| ファイル公開日 |
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日付 |
2027-01-01 |
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日付タイプ |
Available |
012201_1_6_0005129.pdf (3.1 MB)
