Investigación

 

Optical and structural properties of PbS:Bi³+ nanocrystals

 

R. Gutiérrez Pérez^a, O. Portillo Moreno^a,*, L. Chaltel Lima^a, M. Chévez Portillo^b, R. Palomino Merino^c, and M. Zamora Totozintle^a

 

^a Materials Science Laboratory, Facultad de Ciencias Químicas, Universidad Autónoma de Puebla, P.O. Box 1067, Puebla, Pue., 72001 México. * Tel. (01 222) 2-29-55-00 Ext. 7519. e-mail: osporti@yahoo.com.mx

^b Universidad Autónoma de Puebla, Puebla, Pue., 72001 México.

^c Facultad de Ciencias Fisicomatemáticas, Posgrado en Optoelectrónica de la Benemérita Universidad Autónoma de Puebla, Puebla, P.O. Box 1067, C.P. 72001, México.

 

Received 22 April 2015.
Accepted 15 June 2015.

 

Abstract

We report here the growth of nanocrystalline PbS thin films by chemical bath and the effects of doping on the structural and electronics properties as a function of Bi³⁺ concentration. Doping of such PbS films with Bi³⁺ produces considerable optical and structural changes that have an effect on the material properties. The morphological changes of the layers were followed by Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). X-ray diffraction (XRD) spectra show growth of the zinc blende phase. The grain size for the undoped samples was found to be ~ 32 nm, whereas that for the doped samples was 25-15 nm, thus confirming AFM and SEM results. A conspicuous shift for the forbidden band gap energy was observed by optical absorption from 1.2 eV for the undoped samples to a 1.7-2.0 eV range for the doped films.

Keywords: Chemical bath; grain size; cell potential; nanoparticles; coordination complex; doping.

PACS: 71.20.Nr; 68.55.A; 64.70.kg

 

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