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Title: Probing the effect of intrinsic defects and dopants on the structural evolution and optical properties of ZnO nanocrystallites

Role of intrinsic defects and external impurities in modifying the structural and optical properties of ZnO nanostructures has been studied and discussed. ZnO nanocrystallites doped with B, N and S elements have been prepared by ultrasound assisted wet chemical method. Structural evolution of ZnO in presence of dopant ions has been studied by XRD and electron microscopic measurements. Elemental analysis like XPS has been carried out to ascertain the dopant configuration. A variation in crystallographic parameters and microstructure is found to be observed as impurity is incorporated into ZnO. This has been explained on the basis of the substitution of dopant at Zn{sup 2+} and O{sup −} sites rearranging the lattice. Optical absorption measurements and PL studies reflect a change in band gap of ZnO by impurity adsorption. Most of the cases, the band gap is found to be broadened which has been explained in the line of Moss-Burstein effect. The excitonic emission in ZnO is observed to blue shift supporting the above results and the defect emissions also get modified in terms of position and intensity. New PL bands observed have been assigned to the transitions related to the defect states present in the band gap of ZnO alongmore » with intrinsic defects.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Odisha-751013 (India)
  2. (India)
  3. School of Basic Sciences, Centurion University of Technology and Management, Odisha-752050 (India)
  4. Department of Physics, C.V. Raman College of Engineering, Bhubaneswar, Odisha, India-752054 (India)
  5. School of Physics, Sambalpur University, Jyoti Vihar, Burla, Odisha, India-768019 (India)
Publication Date:
OSTI Identifier:
22490234
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ADSORPTION; BORON; CRYSTAL STRUCTURE; DOPED MATERIALS; ELECTRONS; ENERGY GAP; MICROSTRUCTURE; NANOSTRUCTURES; NITROGEN; OPTICAL PROPERTIES; PROBES; SULFUR; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC IONS; ZINC OXIDES