Undoped and nitrogen-doped ZnO nanostructures were grown by Metal Organic Chemical Vapor Deposition method onto Sapphire substrates using NH3 gas as N source. Structural and optical characterizations of undoped and N-doped ZnO nanostructures were done. The XRD studies show that a few peaks arose and the relative intensities of other peaks [in comparison to (002)] increase with higher incorporation of N. PL studies revealed that the width and intensity of PL peaks are strongly influenced by NH3 concentration during growth, which creates a few donor levels (arising due to structural defects) as well as acceptor levels (arising due to N doping). With increase of NH3 concentration during deposition, O substitution by N increases and more NO defects appear in PL spectrum. The effect of oxygen vacancies was compensated by the effect of defect levels appears due to N doping, which causes the p-type nature of N-doped ZnO. The p-type nature of the N-doped ZnO nanostructures was also confirmed by using Hall-effect measurement.
Bibliographical noteFunding Information:
Author J.M. Myoung thanks LG Display (Grant No. 2014-11-1905) for granting financial support. Author S. Das thanks DST, Government of India (Grant No. DST/2013/PH-71 dated 07/01/2014) , for granting financial support.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering