title: The effects of porosity on optical properties of semiconductor chalcogenide films obtained by the chemical bath deposition.
abstract: This paper is dedicated to study the thin polycrystalline films of semiconductor chalcogenide materials (CdS, CdSe, and PbS) obtained by ammonia-free chemical bath deposition. The obtained material is of polycrystalline nature with crystallite of a size that, from a general point of view, should not result in any noticeable quantum confinement. Nevertheless, we were able to observe blueshift of the fundamental absorption edge and reduced refractive index in comparison with the corresponding bulk materials. Both effects are attributed to the material porosity which is a typical feature of chemical bath deposition technique. The blueshift is caused by quantum confinement in pores, whereas the refractive index variation is the evident result of the density reduction. Quantum mechanical description of the nanopores in semiconductor is given based on the application of even mirror boundary conditions for the solution of the Schrödinger equation; the results of calculations give a reasonable explanation of the experimental data.
authors.affiliation: CINVESTAV-IPN Unidad Querétaro, Libramiento Norponiente 2000, Fracc, Real de Juriquilla, Querétaro, Qro, CP 76230, México. vorobiev@qro.cinvestav.mx.
authors.forename: Yuri V
authors.initials: YV
authors.lastname: Vorobiev
authors.forename: Paul P
authors.initials: PP
authors.lastname: Horley
authors.forename: Jorge
authors.initials: J
authors.lastname: Hernández-Borja
authors.forename: Hilda E
authors.initials: HE
authors.lastname: Esparza-Ponce
authors.forename: Rafael
authors.initials: R
authors.lastname: Ramírez-Bon
authors.forename: Pavel
authors.initials: P
authors.lastname: Vorobiev
authors.forename: Claudia
authors.initials: C
authors.lastname: Pérez
authors.forename: Jesús
authors.initials: J
authors.lastname: González-Hernández