Abstract

RINCON, C. et al. Urbach’s tail in the absorption spectra of Cu₂GeSe₃ semiconducting compound. Rev. mex. fis. [online]. 2019, vol.65, n.1, pp.5-9.  Epub Nov 09, 2019. ISSN 0035-001X.

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 hν p 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 hν p 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.

Keywords : Optical absorption; Urbach’s tail; ternary compound; structural defects; 71.20.Nr; 71.55.Jv; 78.30.Hv.

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