Optical Function Spectra and Bandgap Energy of Cu2SnSe3

S. G. Choi, J. Kang, J. Li, H. Haneef, N. J. Podraza, C. Beall, S. H. Wei, S. T. Christensen, I. L. Repins

Research output: Contribution to journalArticlepeer-review

30 Scopus Citations


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.

Original languageAmerican English
Article numberArticle No. 043902
Number of pages5
JournalApplied Physics Letters
Issue number4
StatePublished - 26 Jan 2015

Bibliographical note

Publisher Copyright:
© 2015 AIP Publishing LLC.

NREL Publication Number

  • NREL/JA-5J00-63192


Dive into the research topics of 'Optical Function Spectra and Bandgap Energy of Cu2SnSe3'. Together they form a unique fingerprint.

Cite this