Ellipsometric characterization and density-functional theory analysis of anisotropic optical properties of single-crystal α-SnS

R. E. Banai, L. A. Burton, S. G. Choi, F. Hofherr, T. Sorgenfrei, A. Walsh, B. To, A. Cröll, J. R.S. Brownson

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Abstract

We report on the anisotropic optical properties of single-crystal tin monosulfide (SnS). The components εa, εb, and εc of the pseudodielectric-function tensor 〈ε〉= 〈ε1〉+i〈ε2〉 spectra are taken from 0.73 to 6.45eV by spectroscopic ellipsometry. The measured 〈ε〉 spectra are in a good agreement with the results of the calculated dielectric response from hybrid density functional theory. The 〈ε〉 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 〈ε〉 data. Their probable electronic origins and implications for photovoltaic applications are discussed.

Original languageEnglish (US)
Article number013511
JournalJournal of Applied Physics
Volume116
Issue number1
DOIs
StatePublished - Jul 7 2014

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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