Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1521236 | Materials Chemistry and Physics | 2015 | 9 Pages |
Abstract
Zn1âxCoxO (0 < x < 0.146) conductive thin films have been deposited by reactive magnetron sputtering of metallic Zn and Co targets at high pressure and temperature. The structural properties have been investigated by using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It has been observed that all as-deposited films are crystallized in pure hcp ZnO structure and neither traces of metallic nor oxide Co-rich clusters were detected. The average grain size estimated from full width at half maximum of XRD results varied between 65 and 83 nm. XPS analyses exhibit that Co ions are successfully entered into ZnO lattice as Co+2. The electrical properties including conductivity, carrier density and carrier mobility were determined by Hall effect measurements in a temperature range from 300 K to 475 K. The conductivity of the films decreases from Ï300K = 2.2 Ã 104 to 2.3 Ã 10â1 Smâ1 as the Co content changes from 0 to 0.146. Magnetic measurements reveal the absence of ferromagnetism even at 3 K and a paramagnetic Curie-Weiss behavior associated to magnetic clusters.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Soumia Lardjane, Mohammad Arab Pour Yazdi, Nicolas Martin, Christine Bellouard, Nour-eddine Fenineche, Andreas Schuler, Ghouti Merad, Alain Billard,