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Enhanced charge transport properties of Ag and Al co-doped ZnO nanostructures via solution process

Title
Enhanced charge transport properties of Ag and Al co-doped ZnO nanostructures via solution process
Authors
Khan, FirozBaek, Seong-HoKim, Jae Hyun
DGIST Authors
Baek, Seong-Ho; Kim, Jae Hyun
Issue Date
2016-10-15
Citation
Journal of Alloys and Compounds, 682, 232-237
Type
Article
Article Type
Article
Keywords
AbsorptionAbsorption PeaksAg and Al Co-Doped ZnO NanostructuresAl-Co-Doped ZnOAluminumCrystalline MaterialsCrystalline QualityDoping ConcentrationElectron MobilityEnergy GapNano-StructuresNear-Band Edge RegionsOptical Band-GapOptical Band-GapsPhoto-Luminescent PropertiesPhotoluminescence IntensitiesSilverSol-Gel ProcessSolution ProcessWork-FunctionZinc Oxide
ISSN
0925-8388
Abstract
Conducting Ag and Al co-doped ZnO (ZnO:Al:Ag) nanostructures were synthesized using sol-gel process. The effects of Ag incorporation on the structural, optical, electrical, and photoluminescent properties of ZnO:Al:Ag nanostructures were studied. The crystalline quality of the nanostructures was found to be improved by Ag doping concentration of 0.3% owing to compensation for vacancies created by Al3+ via Ag+. The electrical properties were enhanced for Ag doping concentration of 0.3%. This may be due to an improvement of the crystalline quality. The optical band-gaps (Eg) of the nanostructures are significantly lower than that of undoped ZnO. The Eg of the nanostructures slightly decreased to its minimal value with Ag doping, and was found to be about 3.19 eV for RAg/Zn = 0.3%; the material then retained its initial value of 3.22 eV (RAg/Zn = 0%) for higher Ag doping. With Ag doping, the value of work function (WF) increased from 4.67 eV for RAg/Zn = 0% to 4.99 eV for RAg/Zn = 0.3% due to substitution of Ag+ into Zn2+ sites. An absorption peak in the blue region was observed in the Ag-doped nanostructures; this peak redshifted with the increase of the doping concentration. The photoluminescence (PL) intensity in the near band edge (NBE) region was the highest for the Ag/Zn ratio of 0.3%, whereas the maximum PL intensity in defect region was obtained for the Ag/Zn ratio of 0%. © 2016 Published by Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5069
DOI
10.1016/j.jallcom.2016.04.292
Publisher
Elsevier
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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