Electronic structures and unusually robust bandgap in an ultrahigh-mobility layered oxide semiconductor, Bi2 O2 Se

Science Advances
Cheng ChenY L Chen

Abstract

Semiconductors are essential materials that affect our everyday life in the modern world. Two-dimensional semiconductors with high mobility and moderate bandgap are particularly attractive today because of their potential application in fast, low-power, and ultrasmall/thin electronic devices. We investigate the electronic structures of a new layered air-stable oxide semiconductor, Bi2O2Se, with ultrahigh mobility (~2.8 × 105 cm2/V⋅s at 2.0 K) and moderate bandgap (~0.8 eV). Combining angle-resolved photoemission spectroscopy and scanning tunneling microscopy, we mapped out the complete band structures of Bi2O2Se with key parameters (for example, effective mass, Fermi velocity, and bandgap). The unusual spatial uniformity of the bandgap without undesired in-gap states on the sample surface with up to ~50% defects makes Bi2O2Se an ideal semiconductor for future electronic applications. In addition, the structural compatibility between Bi2O2Se and interesting perovskite oxides (for example, cuprate high-transition temperature superconductors and commonly used substrate material SrTiO3) further makes heterostructures between Bi2O2Se and these oxides possible platforms for realizing novel physical phenomena, such as topological supe...Continue Reading

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Citations

Aug 9, 2019·Physical Chemistry Chemical Physics : PCCP·Hong-Yue SongJing-Tao Lü
May 8, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Lu XuYan-Feng Chen
Dec 11, 2019·Nanoscale Research Letters·Hang YangShiqiao Qin
Aug 2, 2020·Nature Communications·Jialu WangXiao Lin
Jun 27, 2019·Physical Chemistry Chemical Physics : PCCP·Ning WangLiang Qiao
Sep 13, 2019·Small·Hang YangShiqiao Qin
Apr 1, 2020·Physical Chemistry Chemical Physics : PCCP·Linqiang XuJing Lu
Nov 22, 2020·Physical Chemistry Chemical Physics : PCCP·Kerong HuYuan-Hua Lin
Dec 29, 2020·Applied Optics·Zhe Wen Li, Jiu-Sheng Li
Mar 25, 2021·Reports on Progress in Physics·Yangyang WangJing Lu
Apr 8, 2020·ACS Applied Materials & Interfaces·Chengwen Huang, Huangzhong Yu
Dec 31, 2020·The Journal of Physical Chemistry Letters·Xingyong HuangLiujiang Zhou
Dec 12, 2019·Journal of the American Chemical Society·Quinn D GibsonMatthew J Rosseinsky

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Methods Mentioned

BETA
scanning tunneling microscopy
x-ray diffraction
scanning tunneling spectroscopy

Software Mentioned

Vienna Ab initio Simulation Package ( VASP )
ARPES

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