Carbon 1s X-ray photoelectron spectra of realistic samples of hydrogen-terminated and oxygen-terminated CVD diamond (111) and (001)

Shozo Kono, Taisuke Kageura, Yuya Hayashi, Sung Gi Ri, Tokuyuki Teraji, Daisuke Takeuchi, Masahiko Ogura, Hideyuki Kodama, Atsuhito Sawabe, Masafumi Inaba, Atsushi Hiraiwa, Hiroshi Kawarada

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    Key factors in C 1s photoelectron spectroscopy for realistic samples of single crystal diamonds are remarked. Basic equations for angle-dependent photoelectron spectroscopy applied to single crystal diamond samples are described in Appendix A. Carbon 1s photoelectron spectroscopic works so far reported for hydrogen-terminated and oxygen-terminated diamond (001) and (111) samples were reviewed placing special attention on surface C 1s components with reference to the key factors. The results showed diversity in C 1s photoelectron spectra so far reported. We had three specific subjects of the study in C 1s XPS; the first is that we have reconfirmed the phenomenon that surface conductive layers resumed when smooth non-doped CVD C(111)-O samples were annealed in vacuum [Diam.Rela.Mate.18(2009)206]. A single C 1s XPS surface component was found for a smooth C(111)-O sample before the vacuum-anneal, which was attributed to surface carbon atoms in C–O–H bonding. The second subject is that dependence of C 1s XPS spectra on surface sensitivity has been measured for all the samples with different surface roughness of C(001)-O, C(111)-O, C(001)-H, and C(111)-H. The results were converted to the energy difference between the Fermi-level (Ef) and valence band maximum (Ev) on the probing depth from the surface. All the samples showed downward bending of Ev toward the surface. For the C(001)-H samples, this was a reconfirmation of previous work [Surf.Sci.604(2010)1148]. For the C(001)-H and C(111)-H samples, various degrees of downward band bending toward surface were observed and analyzed with two-dimensional band simulation. It was concluded that another source of holes such as shallow acceptors is present in a deeper region of the surface in addition to holes very close to surface caused by the charge-transfer-doping. The third subject is that C 1s XPS spectra for superconducting C(111)-O samples showed a lattice distortion of ~9 monolayers near the surface.

    元の言語English
    ページ(範囲)105-130
    ページ数26
    ジャーナルDiamond and Related Materials
    93
    DOI
    出版物ステータスPublished - 2019 3 1

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    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Chemistry(all)
    • Mechanical Engineering
    • Materials Chemistry
    • Electrical and Electronic Engineering

    これを引用

    Kono, S., Kageura, T., Hayashi, Y., Ri, S. G., Teraji, T., Takeuchi, D., Ogura, M., Kodama, H., Sawabe, A., Inaba, M., Hiraiwa, A., & Kawarada, H. (2019). Carbon 1s X-ray photoelectron spectra of realistic samples of hydrogen-terminated and oxygen-terminated CVD diamond (111) and (001). Diamond and Related Materials, 93, 105-130. https://doi.org/10.1016/j.diamond.2019.01.017