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Effect of Solution pH and Post-annealing temperatures on the Optical Bandgap of the Copper Oxide Thin Films Grown by modified SILAR Method

Published online by Cambridge University Press:  22 February 2019

S.F.U. Farhad Open the ORCID record for S.F.U. Farhad [Opens in a new window] ,
S. Majumder ,
Md. A. Hossain ,
N.I. Tanvir ,
R. Akter  and
Md. A.M. Patwary
S.F.U. Farhad*
Affiliation:
Solar Energy Conversion and Storage Research Section, Industrial Physics Division, BCSIR Labs, Dhaka1205, Bangladesh Council of Scientific and Industrial Research (BCSIR), Bangladesh
S. Majumder
Affiliation:
Physical Chemistry Research Laboratory, Department of Chemistry, Comilla University, Comilla3506, Bangladesh
Md. A. Hossain
Affiliation:
Physical Chemistry Research Laboratory, Department of Chemistry, Comilla University, Comilla3506, Bangladesh
N.I. Tanvir
Affiliation:
Solar Energy Conversion and Storage Research Section, Industrial Physics Division, BCSIR Labs, Dhaka1205, Bangladesh Council of Scientific and Industrial Research (BCSIR), Bangladesh
R. Akter
Affiliation:
Physical Chemistry Research Laboratory, Department of Chemistry, Comilla University, Comilla3506, Bangladesh
Md. A.M. Patwary
Affiliation:
Physical Chemistry Research Laboratory, Department of Chemistry, Comilla University, Comilla3506, Bangladesh
*
*E-mail: [email protected] / Phone: (0088) 01881755767
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Abstract

Cuprous oxide (Cu2O) thin films have been grown on both soda lime glass (SLG) microscope slides and Fluorine-doped Tin Oxide (FTO) substrates by a modified SILAR technique. The pH level of the bath solution was systematically varied in the range of 4.50 – 7.95 to elucidate their effect on the physical properties of the deposited product. The prepared films showed compact surface morphology composed of spherical grains evident from their SEM images. The XRD measurement showed that the as-deposited films were single phase Cu2O with (111) preferred orientation and this texturing was found to be increasing with increasing pH and annealing temperature. The annealed Cu2O films were found to be stable up to 200 °C and completely converted to cupric oxide (CuO) phases when the temperature reached to 350 °C. The estimated optical bandgaps of the as-grown samples were found in the range of 2.28 – 2.48 eV using UV-Vis-NIR transmission data and showing a bandgap narrowing trend with the decreasing level of solution pH. The effect of post-annealing temperatures (75-350 0C) on the as-deposited films was also studied and found to be crucial to control the optical bandgap (1.44 – 2.13) eV and electrical properties of the films. The sheet resistance of the as-deposited samples was found to be decreasing from 4120 MΩ/square to 800 MΩ/square while grown with increasing acetic acid content in the precursor solutions and decreasing up to 2.66 MΩ/square while annealing up to 250 °C in the air.

Keywords

chemical synthesisoptical propertiesscanning electron microscopy (SEM)thin filmx-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 4 , Issue 16: Energy-Transfer, Storage and Conversion , 2019 , pp. 937 - 944
Copyright
Copyright © Materials Research Society 2019 

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References

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