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Pressure Impact on the Crystal Structure, Optical, and Transport Properties in Layered Oxychalcogenides BiCuChO (Ch = S, Se)
Qian Zhang;  Chen Chen;  Nana Li;  Quan Huang;  Yu He;  Xuqiang Liu;  Bihan Wang;  Dongzhou Zhang;  Duck Young Kim;  Yonggang Wang;  Bo Xu;  Wenge Yang
2018
Source PublicationThe Journal of Physical Chemistry C
Volume122Issue:28Pages:15929-15936
Abstract

The layered oxychalcogenides BiCuChO (Ch = S, Se, Te) represent a unique family of two-dimensional semiconductors with extraordinary optoelectronic and thermoelectric properties. Chemical strategies such as elemental doping have been used to modify their crystal structures and electronic configurations for better photocatalytic performances. Herein, we report the pressure impact on the crystalline and electronic band structures of BiCuChO (Ch = S, Se) with in situ synchrotron X-ray diffraction, Raman spectroscopy, electric resistivity and photocurrent measurements, and first principle calculations. Under pressure, the crystalline lattices shrink continuously without symmetry breaking, which enhances the crystal field splitting; on the other hand, the pressure-induced charge delocalization causes the band broadening. The competition between the crystal field and charge delocalization demonstrates an efficient tool for band gap engineering: the electrical conductivity is enhanced below 12 GPa and monotonically decreases up to 40 GPa. In addition, BiCuSeO exhibits considerable photocurrent up to 40 GPa, which suggests its potential application in pressure-responsive optoelectrical devices. The comprehensive studies of the pressure effect on the crystal structure and electronic properties in two-dimensional semiconductors provide and in-depth understanding for developing new optoelectronic materials under extreme conditions.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8835
Collection地球内部物质高温高压实验室
Affiliation1.Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
2.State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China
3.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China
4.School of Material Science and Engineering, Northeastern University, Shenyang 110819, China
5.Hawaii Institute of Geophysics & Planetology, University of Hawaii Manoa, Honolulu, Hawaii 96822, United States
6.High Pressure Synergetic Consortium (HPSynC), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
Recommended Citation
GB/T 7714
Qian Zhang;Chen Chen;Nana Li;Quan Huang;Yu He;Xuqiang Liu;Bihan Wang;Dongzhou Zhang;Duck Young Kim;Yonggang Wang;Bo Xu;Wenge Yang. Pressure Impact on the Crystal Structure, Optical, and Transport Properties in Layered Oxychalcogenides BiCuChO (Ch = S, Se)[J]. The Journal of Physical Chemistry C,2018,122(28):15929-15936.
APA Qian Zhang;Chen Chen;Nana Li;Quan Huang;Yu He;Xuqiang Liu;Bihan Wang;Dongzhou Zhang;Duck Young Kim;Yonggang Wang;Bo Xu;Wenge Yang.(2018).Pressure Impact on the Crystal Structure, Optical, and Transport Properties in Layered Oxychalcogenides BiCuChO (Ch = S, Se).The Journal of Physical Chemistry C,122(28),15929-15936.
MLA Qian Zhang;Chen Chen;Nana Li;Quan Huang;Yu He;Xuqiang Liu;Bihan Wang;Dongzhou Zhang;Duck Young Kim;Yonggang Wang;Bo Xu;Wenge Yang."Pressure Impact on the Crystal Structure, Optical, and Transport Properties in Layered Oxychalcogenides BiCuChO (Ch = S, Se)".The Journal of Physical Chemistry C 122.28(2018):15929-15936.
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