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Akademický článek

Influence of surface carbon on the performance of cesiated p-GaN photocathodes with high quantum efficiency

Autor: Jana Schaber, Rong Xiang, Jochen Teichert, André Arnold, Petr Murcek, Paul Zwartek, Anton Ryzhov, Shuai Ma, Stefan Gatzmaga, Peter Michel

Publikováno v: Scientific Reports, Vol 13, Iss 1, Pp 1-12 (2023)

Abstract This study shows residual surface carbon’s influence on photocathodes’ quantum efficiency based on p-GaN grown on sapphire by metal organic chemical vapor deposition. An X-ray photoelectron spectrometer (XPS) built in an ultrahigh vacuum

Externí odkaz: https://doaj.org/article/42df3b0cb7fc4833b5d8fc1b9d65a2f0

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Akademický článek

Influence of Surface Cleaning on Quantum Efficiency, Lifetime and Surface Morphology of p-GaN:Cs Photocathodes

Autor: Jana Schaber, Rong Xiang, Jochen Teichert, André Arnold, Petr Murcek, Paul Zwartek, Anton Ryzhov, Shuai Ma, Stefan Gatzmaga, Peter Michel, Nikolai Gaponik

Publikováno v: Micromachines, Vol 13, Iss 6, p 849 (2022)

Accelerator scientists have high demands on photocathodes possessing high quantum efficiency (QE) and long operational lifetime. p-GaN, as a new photocathode type, has recently gained more and more interest because of its ability to form a negative e

Externí odkaz: https://doaj.org/article/31690b9f2a254947bec802decbe101ec

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Akademický článek

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Akademický článek

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Data to Impact on various cleaning procedures on p-GaN surfaces

Autor: Schaber, J., Xiang, R., Arnold, A., Ryzhov, A., Teichert, J., Murcek, P., Zwartek, P., Ma, S., Michel, P.

Publikováno v: Publication date: 2023-02-23 Open accessDOI: 10.14278/rodare.2167Versions: 10.14278/rodare.2168License: CC-BY-4.0

This folder "XPS data" contains original and evaluated XPS data (.vms) on a p-GaN sample which was treated at various temperatures and underwent Ar+ irradiation. Furthermore, the folder "REM Images" contains REM images (.tif) and EDX data (.xlsx) on

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::6c859959fcd4ff9d5f3197e0121f6d9b
https://www.hzdr.de/publications/Publ-36606-1

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Impact of various cleaning procedures on p-GaN surfaces

Autor: Schaber, J., Xiang, R., Arnold, A., Ryzhov, A., Teichert, J., Murcek, P., Zwartek, P., Ma, S., Michel, P.

Publikováno v: Surface and Interface Analysis 55(2023), 507-514

This work discusses the influence of different cleaning procedures on p-GaN grown on sap-phire by metal-organic chemical vapor deposition. The cleaned p-GaN surface was trans-ferred into an ultra-high vacuum chamber and studied by an X-ray photoelect

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::b604140ee722e6783f2b3daa0392b8f8
https://www.hzdr.de/publications/Publ-36534-1

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Akademický článek

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Dataset to publication: Influence of surface carbon on the performance of cesiated p-GaN photocathodes with high quantum efficiency

Autor: Schaber, J., Xiang, R., Teichert, J., Arnold, A., Murcek, P., Zwartek, P., Ryzhov, A., Ma, S., Gatzmaga, S., Michel, P.

Publikováno v: Publication date: 2022-10-27 Open accessDOI: 10.14278/rodare.1890Versions: 10.14278/rodare.1891License: CC-BY-4.0

This data repository contains analyzed data files of the shown figures. Please see the info.txt files in the individual directories and the original manuscript for guidance. Manuscript title: Influence of surface carbon on the performance of cesiated

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::fcebb5e18ad48697fdf268dde619e6d3
https://www.hzdr.de/publications/Publ-36591-1

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Study on QE Evolution of Cs2Te photocathodes in ELBE SRF GUN-II

Autor: Xiang, R., Arnold, A., Ma, S., Michel, P., Murcek, P., Schaber, J., Teichert, J., Ryzhov, A., Zwartek, P.

Publikováno v: 13th Int. Particle Acc. Conf. (IPAC2022), 12.-17.06.2022, Bangkok, Thailand

The quality of the photocathodes is critical for the stability and reliability of the photoinjector’s operation. Thanks to the robust magnesium and Cs2Te photocathodes, SRFgun-II at HZDR has been proven to be a successful example in CW mode for hig

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::729a9fdaee2d343b6851bb5cfc2ca981
https://www.hzdr.de/publications/Publ-35417-1

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Resolving surface chemical states of p-GaN:Cs photocathodes by XPS analysis

Autor: Schaber, J., Xiang, R., Teichert, J., Murcek, P., Zwartek, P., Arnold, A., Ryzhov, A., Ma, S.

Publikováno v: International Workshop on Nitride Semiconductors (IWN), 09.-14.10.2022, Berlin, Deutschland

An x-ray photoelectron spectrometer (XPS) is used in the HZDR photocathode lab to understand the surface states of GaN photocathodes during its cleaning, cesium activation and degradation. The XPS probes the electronic structure of the p-doped GaN ph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::b00b7f6621a0f6b955b07d52073d6f70
https://www.hzdr.de/publications/Publ-35465-1

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