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

C. Rincón | Zendy

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

Author(s) -

C. Rincón

Publication year - 2018

Publication title -

revista mexicana de física

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.181

H-Index - 25

eISSN - 2683-2224

pISSN - 0035-001X

DOI - 10.31349/revmexfis.65.5

Subject(s) - stoichiometry , phonon , materials science , exciton , condensed matter physics , doping , absorption (acoustics) , electron , spectral line , absorption spectroscopy , ideal (ethics) , physics , chemistry , optics , philosophy , epistemology , quantum mechanics , astronomy , composite material

In the present work we report on the analysis of the Urbach’s tail in pure and Mn-doped Cu 2 GeSe 3 samples having small deviation from its ideal stoichiometry. It is found that the high values of the phonon energy h n 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 h n p for pure and doped samples were found to be 48, 60 and 81 meV, respectively, whereas the phonon energy for an entirely ordered Cu 2 GeSe 3 sample was estimated to be about 25 meV.

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