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, and F. Yakuphanoglu . 2020
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 (Eg) 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 EU (Urbach
Energy) is improved with the enhancement of Cu doping concentration. Ultraviolet (UV) and blue-green
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.
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