journal article·2019-09

Molecular Beam Epitaxy and Electronic Structure of Atomically Thin Oxyselenide Films

Yan Liang, Yujie Chen, Yuanwei Sun, Shipu Xu, Jinxiong Wu, Congwei Tan, Xiaofeng Xu, Hongtao Yuan, Lexian Yang, Yulin Chen, Peng Gao, Jiandong Guo, Hailin Peng

Advanced Materials· Volume 31· Issue 39
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Abstract

Abstract Atomically thin oxychalcogenides have been attracting intensive attention for their fascinating fundamental properties and application prospects. Bi2O2Se, a representative of layered oxychalcogenides, has emerged as an air‐stable high‐mobility 2D semiconductor that holds great promise for next‐generation electronics. The preparation and device fabrication of high‐quality Bi2O2Se crystals down to a few atomic layers remains a great challenge at present. Here, molecular beam epitaxy (MBE) of atomically thin Bi2O2Se films down to monolayer on SrTiO3 (001) substrate is achieved by co‐evaporating Bi and Se precursors in oxygen atmosphere. The interfacial atomic arrangements of MBE‐grown Bi2O2Se/SrTiO3 are unambiguously revealed, showing an atomically sharp interface and atom‐to‐atom alignment. Importantly, the electronic band structures of one‐unit‐cell (1‐UC) thick Bi2O2Se films are observed by angle‐resolved photoemission spectroscopy (ARPES), showing low effective mass of ≈0.15 m0 and bandgap of ≈0.8 eV. These results may be constructive to the synthesis of other 2D oxychalcogenides and investigation of novel physical properties.
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Research context

OpenAlex topics: 2D Materials and Applications · Electronic and Structural Properties of Oxides · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Nanochemistry Beijing Science and Engineering Centre for Nanocarbons College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China

State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 P. R. China

Electron Microscopy Laboratory School of Physics and International Center for Quantum Materials Peking University Beijing 100871 P. R. China

Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 P. R. China

Beijing National Laboratory for Condensed Matter Physics & Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China

National Laboratory of Solid‐State Microstructures College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 P. R. China

Funding

National Natural Science Foundation of China · National Basic Research Program of China

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