Bandgap Tuning and Blue-Green Band Emissions of Sol-Gel Synthesized ZnO Films by High Cu Doping

Amanullah Fatehmulla; Iqram Abdulkarim AlDawood; Rabia Qindeel; A M Aldhafiri; A A Albassam; M Shahabuddin; W A Farooq; F Yakuphanoglu

doi:10.1166/jnn.2020.18536

Bandgap Tuning and Blue-Green Band Emissions of Sol-Gel Synthesized ZnO Films by High Cu Doping

J Nanosci Nanotechnol. 2020 Aug 1;20(8):5217-5222. doi: 10.1166/jnn.2020.18536.

Authors

Amanullah Fatehmulla¹, Iqram Abdulkarim AlDawood¹, Rabia Qindeel¹, A M Aldhafiri¹, A A Albassam¹, M Shahabuddin¹, W A Farooq¹, F Yakuphanoglu²

Affiliations

¹ Department of Physics & Astronomy, College of Science, King Saud University, Riyadh-11451, Saudi Arabia.
² Department of Physics, Faculty of Science, Firat University, Elazig, 23119, Turkey.

PMID: 32126723
DOI: 10.1166/jnn.2020.18536

Abstract

The present research focuses on the preparation of ZnO thin films both undoped and doped with varying Cu concentrations (0.0%, 0.8%, 3.0%, 5.0%, 10.0% and 20.0%) using sol-gel spin coating technique. The optical bandgap (E_g) for undoped films is recorded as 3.239 eV and shows a little increase to 3.248 eV when it is doped with 0.8% Cu concentration whereas further increase of Cu doping concentration, it is decreased from 3.248 eV to 3.107 eV for 20% Cu. The E_U (Urbach Energy) is improved with the enhancement of Cu doping concentration. Ultraviolet (UV) and bluegreen band emissions are noticed from PL (photoluminescence) spectra. The UV peak intensities are diminished with increasing Cu doping concentration while the blue peaks intensities are amplified. These results illustrate that ZnO films doped with Cu meet the requirement for applications in different blue emission devices.