文献类型：期刊文献

英文题名：Vacuum ultraviolet excitation luminescence spectroscopy of few-layered MoS2

作者：Pankratov, V.[1];Hoszowska, J.[2];Dousse, J-Cl[2];Huttula, M.[1];Kis, A.[3];Krasnozhon, D.[3];Zhang, M.[4];Cao, W.[1]

机构：[1]Univ Oulu, Res Ctr Mol Mat, FIN-90014 Oulu, Finland;[2]Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland;[3]Ecole Polytech Fed Lausanne, Inst Elect Engn, CH-1015 Lausanne, Switzerland;[4]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2016

卷号：28

期号：1

外文期刊名：JOURNAL OF PHYSICS-CONDENSED MATTER

收录：;EI(收录号：20155101680126);WOS:【SCI-EXPANDED(收录号:WOS:000367998100011)】；

基金：We acknowledge the financial support from Oulu University Strategic Funding, Research Council of Natural Sciences of the Academy of Finland, the Swiss National Science Foundation, and the National Natural Science Foundation of China (No 51205001, No 11204079). The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) CALIPSO under Grant Agreement No 312284. The authors thank also the crew of the MAX-IV laboratory for their support during the beamtime operation.

语种：英文

外文关键词：low dimensional MoS2; excitation spectrum; first-principles calculations; photoluminescence

摘要：We report on vacuum ultraviolet (VUV) excited photoluminescence (PL) spectra emitted from a chemical vapor deposited MoS2 few-layered film. The excitation spectrum was recorded by monitoring intensities of PL spectra at similar to 1.9 eV. A strong wide excitation band peaking at 7 eV was found in the excitation. The PL excitation band is most intensive at liquid helium temperature and completely quenched at 100 K. Through first-principles calculations of photoabsorption in MoS2, the excitation was explicated and attributed to transitions of electrons from p- and d- type states in the valence band to the d- and p-type states in the conduction band. The obtained photon-in/photon-out results clarify the excitation and emission behavior of the low dimensional MoS2 when interacting with the VUV light sources.