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AFM Studies on the Morphological Evolution of Chemically Deposited In2S3 Thin Films as a Function of Deposition Time

Published online by Cambridge University Press:  01 February 2011

Merida Sotelo-Lerma ,
Omar Armando Castelo-Gonzalez ,
Rafael Ramirez-Bon  and
Francisco Javier Espinoza-Beltran
Merida Sotelo-Lerma
Affiliation:
msotelo@guaymas.uson.mx, Universidad de Sonora, Departamento de Investigacion en Polimeros y Materiales, Rosales y Blvd. Luis Encinas s/n, Apdo. Postal 130, Hermosillo, Sonora, 83190, Mexico, (52)(662)2592161, (52)(662)2592216
Omar Armando Castelo-Gonzalez
Affiliation:
omarcastelo@correo.uson.mx, Universidad de Sonora, Departamento de Investigacion en Polimeros y Materiales, Apdo. Postal 130, Hermosillo, Sonora, 83190, Mexico
Rafael Ramirez-Bon
Affiliation:
rrbon@qro.cinvestav.mx, Centro de Investigación y Estudios Avanzados del IPN. Unidad Querétaro, Apdo. Postal 1-798, Querétaro, Querétaro, 76001, Mexico
Francisco Javier Espinoza-Beltran
Affiliation:
fespinoza@qro.cinvestav.mx, Centro de Investigación y Estudios Avanzados del IPN. Unidad Querétaro, Apdo. Postal 1-798, Querétaro, Querétaro, 76001, Mexico
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Abstract

Indium sulphide (In2S3) is a very promising semiconductor material for window layers in solar cell devices. It is currently being investigated for high efficiency solar cell based on Cu(In,Ga)Se2-In2S3 heterostructures. The chemical bath deposition (CBD) technique is one of the most convenient methods to obtain In2S3 films because of its simplicity, low cost and some other advantages. Amorphous and polycrystalline In2S3 films on glass substrates have been obtained by the CBD technique. Like in many others CBD processes, the deposition mechanism and kinetic growth of In2S3 films on glass substrates is not very well understood [1-6]. In this work we have chemically deposited In2S3 films for different times from 6 up to 39 hours, in order to study by atomic force microscopy (AFM) the formation of the films on glass substrates. The AFM measurements were performed in a liquid medium in which the cantilever tip and the sample are completely immersed in the liquid. A specially designed AFM cell is composed of a tip attached to a circular transparent window, the liquid level is between the upper and lower surface of the window, and a circular meniscus is established around the window, preventing the tip could be affected or destroyed by the surface tension of the liquid. By using this liquid AFM technique, we can at real-time observe the thin film forming process, and thereby clearly reveal the growing mechanism. It is an ideal and more practical tool for in situ investigation of samples which are normally found in liquid environments.

Keywords

solution depositionnucleation & growthsemiconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 945: Symposium FF – Materials and Basic Research Needs for Solar Energy Conversion , 2006 , 0945-FF06-06
Copyright
Copyright © Materials Research Society 2006

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