Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 1, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4886915
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Funding
- U.S. Department of Energy as a part of the Non-Proprietary Partnering Program at the National Renewable Energy Laboratory [DE-AC36-08-GO28308]
- Royal Society
- EPSRC [EP/G03768X/1]
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We report on the anisotropic optical properties of single-crystal tin monosulfide (SnS). The components epsilon(a), epsilon(b), and epsilon(c) of the pseudodielectric-function tensor - + i spectra are taken from 0.73 to 6.45 eV by spectroscopic ellipsometry. The measured spectra are in a good agreement with the results of the calculated dielectric response from hybrid density functional theory. The spectra show the direct band-gap onset and a total of eight above-band-gap optical structures that are associated with the interband-transition critical points (CPs). We obtain accurate CP energies by fitting analytic CP expressions to second-energy-derivatives of the data. Their probable electronic origins and implications for photovoltaic applications are discussed. (C) 2014 AIP Publishing LLC.
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