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Optical function spectra and bandgap energy of Cu2SnSe3

Title
Optical function spectra and bandgap energy of Cu2SnSe3
Authors
Choi, Suk GeunKang, Jin KyuLi, JianHaneef, Hamna F.Podraza, Nikolas J.Beall, Carolyn L.Wei, SuhuaiChristensen, S. T.Repins, Ingrid L.
DGIST Authors
Kang, Jin Kyu
Issue Date
2015
Citation
Applied Physics Letters, 106(4)
Type
Article
Article Type
Article
Keywords
Complex Dielectric FunctionsDensity Functional TheoryElectronic OriginEnergy GapExperimental SpectraMonoclinic PhaseOptical FunctionOptical StructuresRoom-TemperatureSpectroscopic EllipsometryTauc-Lorentz Models
ISSN
0003-6951
Abstract
We present the optical function spectra of Cu2SnSe3 determined from 0.30 to 6.45 eV by spectroscopic ellipsometry (SE) at room temperature. We analyze the SE data using the Tauc-Lorentz model and obtain the direct-bandgap energy of 0.49 ± 0.02 eV, which is much smaller than the previously known value of 0.84 eV for the monoclinic-phase Cu2SnSe3. We also perform density-functional theory calculations to obtain the complex dielectric function data, and the results show good agreement with the experimental spectrum. Finally, we discuss the electronic origin of the main optical structures. © 2015 AIP Publishing LLC.
URI
http://hdl.handle.net/20.500.11750/5218
DOI
10.1063/1.4907202
Publisher
American Institute of Physics Inc.
Related Researcher
Files:
There are no files associated with this item.
Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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