Resumen de Urbach’s tail in the absorption spectra of Cu2GeSe3 semiconducting compound
C. Rincón, G. Marcano, S.M. Wasim, G. Marín, M. Villareal, G. Sánchez Pérez
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 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.
