Presentation Information
[22a-A501-3]PEEM Observation of Work Function Changes on LaB6 Coated by 2D Materials
〇Shuichi Ogawa1, Ryunosuke Yusa2, Gaoxue Wang3, Michael T. Pettes3, Fangze Liu4, Yasutaka Tsuda5, Akitaka Yoshigoe5, Tadashi Abukawa2, Nathan A. Moody3, Hisato Yamaguchi3 (1.Nihon Univ., 2.Tohoku Univ., 3.LANL, 4.Beijing Inst. Tech., 5.JAEA)
Keywords:
hBN,PEEM,electron emitter
We found that a single-layer hBN coating of LaB6 lowers the work function: PEEM revealed that the hBN-coated region has a lower work function than the uncoated and graphene-coated regions. hBN-coated regions have a work function that is 0.4 eV lower than the uncoated region. Density functional theory calculations support this result, and the addition of the oxide film improves the agreement between the calculated and experimental results. Synchrotron X-ray photoemission spectroscopy confirmed the presence of an oxide layer in LaB6.