Transition from n- to p-type of spray pyrolysis deposited Cu doped ZnO thin films for NO2 sensing

Rahmani, M. B., Keshmiri, S. H., Shafiei, M., Latham, K., Wlodarski, W., Plessis, J. D., & Kalantar-Zadeh, K. (2009) Transition from n- to p-type of spray pyrolysis deposited Cu doped ZnO thin films for NO2 sensing. Sensor Letters, 7(4), pp. 1-8.

View at publisher


The structural, optical, and gas-sensing properties of spray pyrolysis deposited Cu doped ZnO thin films were investigated. Gas response of the undoped and doped films to N02 (oxidizing) gas shows an increase and decrease in resistance, respectively, indicating p-type conduction in doped samples. The UV-Vis spectra of the films show decrease in the bandgap with increasing Cu concentration in ZnO. The observed p-type conductivity is attributed to the holes generated by incorporated Cu atoms on Zn sites in ZnO thin films. The X-ray diffraction spectra showed that samples are polycrystalline with the hexagonal wurtzite structure and increasing the concentration of Cu caused a decrease in the intensity of the dominant (002) peak. The surface morphology of films was studied by scanning electron microscopy and the presence of Cu was also confirmed by X-ray photoelectron spectroscopy. Seebeck effect measurements were utilized to confirm the p-type conduction of Cu doped ZnO thin films. Copyright © 2009 American Scientific Publishers All rights reserved.

Impact and interest:

19 citations in Scopus
Search Google Scholar™
17 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 44195
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By (since 1996): 3
Export Date: 24 August 2011
Source: Scopus
Additional URLs:
Keywords: Cu doping, Gas sensors, Spray pyrolysis, Zinc oxide
DOI: 10.1166/sl.2009.1121
ISSN: 1546-198X
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: American Scientific Publishers.
Deposited On: 29 Aug 2011 06:34
Last Modified: 29 Feb 2012 14:32

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page