Urbach’s tail in the absorption spectra of Cu2GeSe3 semiconducting compound

Authors

  • Carlos Gustavo Rincón Universidad de Los Andes, Mérida, Venezuela

DOI:

https://doi.org/10.31349/RevMexFis.65.5

Keywords:

Optical absorption, Urbach’s tail, ternary compound, structural defects.

Abstract

In the present work we report on the analysis of the Urbach’s tail in pure and Mn-doped Cu2GeSe3 samples having small deviation from its ideal stoichiometry. It is found that the high values of the phonon energy hnp involved in the electrons/excitons-phonon interaction in the formation of this tail are due to structural disorder caused by deviation from ideal stoichiometry. Values of hnp for pure and doped samples were found to be 48, 60 and 81 meV, respectively, whereas the phonon energy for an entirely ordered Cu2GeSe3 sample was estimated to be about 25 meV.

Author Biography

Carlos Gustavo Rincón, Universidad de Los Andes, Mérida, Venezuela

Physics Department, Full Professor

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Published

2018-12-31

How to Cite

[1]
C. G. Rincón, “Urbach’s tail in the absorption spectra of Cu2GeSe3 semiconducting compound”, Rev. Mex. Fís., vol. 65, no. 1 Jan-Feb, pp. 5–9, Dec. 2018.

Issue

Vol. 65 No. 1 Jan-Feb (2019): Revista Mexicana de Física

Section

05 Condensed Matter

License

Authors retain copyright and grant the Revista Mexicana de Física right of first publication with the work simultaneously licensed under a CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.