Electronic structures and unusually robust bandgap in an ultrahigh-mobility layered oxide semiconductor, Bi2O2Se
- Univ. of Oxford (United Kingdom). Dept. of Physics
- Chinese Academy of Sciences (CAS), Shanghai (China). ShanghaiTech Univ. Shanghai Science Research Center. School of Physical Science and Technology
- Peking Univ., Beijing (China). College of Chemistry and Molecular Engineering. Beijing National Lab. for Molecular Sciences. Center for Nanochemistry
- Weizmann Inst. of Science, Rehovot (Israel). Dept. of Condensed Matter Physics
- Max Planck Society, Dresden (Germany). Max Planck Inst. for Chemical Physics of Solids
- Tsinghua Univ., Beijing (China). State Key Lab. of Low Dimensional Quantum Physics. Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Chinese Academy of Sciences (CAS), Shanghai (China). ShanghaiTech Univ. Shanghai Science Research Center. School of Physical Science and Technology; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Accelerator Lab.
- Univ. of Oxford (United Kingdom). Dept. of Physics; Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Nanjing Univ. (China). Collaborative Innovation Center of Advanced Microstructures. College of Engineering and Applied Sciences. National Lab. of Solid-State Microstructures
- Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy. Key Lab. of Artificial Structures and Quantum Control (Ministry of Education)
- Univ. of Oxford (United Kingdom). Dept. of Physics; Chinese Academy of Sciences (CAS), Shanghai (China). ShanghaiTech Univ. Shanghai Science Research Center. School of Physical Science and Technology; Tsinghua Univ., Beijing (China). State Key Lab. of Low Dimensional Quantum Physics. Dept. of Physics
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 × 105cm2/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 superconductivity, Josephson junction field-effect transistor, new superconducting optoelectronics, and novel lasers.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1625997
- Journal Information:
- Science Advances, Vol. 4, Issue 9; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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