• 文献标题:   Single layer graphene protective gas barrier for copper photocathodes
  • 文献类型:   Article
  • 作  者:   LIU FZ, MOODY NA, JENSEN KL, PAVLENKO V, VILLARRUBIA CWN, MOHITE AD, GUPTA G
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951 EI 1077-3118
  • 通讯作者地址:   Los Alamos Natl Lab
  • 被引频次:   8
  • DOI:   10.1063/1.4974738
  • 出版年:   2017

▎ 摘  要

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.