Single layer graphene protective gas barrier for copper photocathodes

Fangze Liu, Nathan A. Moody, Kevin L. Jensen, Vitaly Pavlenko, Claudia W. Narvaez Villarrubia, Aditya D. Mohite, Gautam Gupta

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Photocathodes can benefit from a thin protection layer and attain long-term stability. Graphene is potentially a good candidate for such application. We report direct growth of single-layer graphene on single crystal Cu(110) photocathodes using chemical vapor deposition and the effective protection of copper photocathodes with graphene against degradation under atmospheric conditions. Due to the interaction and charge transfer between graphene and copper, the graphene-protected cathodes have 0.25 eV lower work function and 17% higher quantum efficiency at 250 nm compared with bare Cu cathodes. The graphene coating can protect copper photocathodes from degradation for more than 20 min in an exposure to 200 Torr of air. The validation of graphene-photocathode compatibility opens a new route to the lifetime-extension for photocathodes.

Original languageEnglish
Article number041607
JournalApplied Physics Letters
Volume110
Issue number4
DOIs
Publication statusPublished - 23 Jan 2017
Externally publishedYes

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