Three-dimensional band structure and surface electron accumulation of rs-CdxZn1−xO studied by angle-resolved photoemission spectroscopy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Kazutoshi Takahashi
  • Masaki Imamura
  • Jang Hyo Chang
  • Tooru Tanaka
  • Katsuhiko Saito
  • Qixin Guo
  • Wladek Walukiewicz

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Detail(s)

Original languageEnglish
Article number8026
Number of pages10
Journal / PublicationScientific Reports
Volume9
Early online date29 May 2019
Publication statusPublished - 2019

Link(s)

Abstract

Three-dimensional band structure of rock-salt (rs) CdxZn1−xO (x = 1.0, 0.83, and 0.60) have been determined by angle-resolved photoemission spectroscopy (ARPES) using synchrotron radiation. Valence-band features shift to higher binding energy with Zn content, while the conduction band position does not depend strongly on Zn content. An increase of the indirect band gap with Zn-doping is larger than that of the direct band gap, reflecting a weaker hybridization between Zn 3d and O 2p than that between Cd 4d and O 2p. Two-dimensional electronic states due to the quantization along surface normal direction are formed in the surface accumulation layer and show non-parabolic dispersions. Binding energy of the quantized two-dimensional state is well reproduced using an accumulation potential with the observed surface band bending and the characteristic width of about 30 Å.

Research Area(s)

Citation Format(s)

Three-dimensional band structure and surface electron accumulation of rs-CdxZn1−xO studied by angle-resolved photoemission spectroscopy. / Takahashi, Kazutoshi; Imamura, Masaki; Chang, Jang Hyo; Tanaka, Tooru; Saito, Katsuhiko; Guo, Qixin; Yu, Kin Man; Walukiewicz, Wladek.

In: Scientific Reports, Vol. 9, 8026, 2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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