Hernández, E., Rincón, C., Wasim, S., Marín, G., Bocaranda, P., Sánchez Pérez, G., Mora, A. and Molina, I. 1. Urbach”™s tail in the optical absorption spectra of CuInSe2 semiconductor. Rev. Téc. Fac. Ing. Univ. Zulia. 22, 3 (1).