Significant Enhancement in Electrical Conductivity of Al doped ZnO Nanocrystals

5 Pages Posted: 2 Mar 2022

See all articles by Baban Gawari

Baban Gawari

Gokhale Education Society’s, Arts, Commerce and Science College Jawhar, Palghar, India

Shital Kahane

School of Physics, Dr. Vishwanath Karad MIT World Peace University, Pune, India

Shailaja Mahamuni

Department of Physics, Savitribai Phule Pune University, Pune, India

Date Written: February 25, 2022

Abstract

Undoped and Al-doped ZnO (Al-ZnO) nanocrystals (NCs) were prepared by microwave irradiation method with doping concentration 1%, 3%, 5%, 7%, and 10%. The particle size of ZnO and Al-ZnO NCs was calculated by the Scherrer formula and found to be around 26 nm to 20 nm respectively. The X-ray diffraction pattern shows no secondary phase in the case of Al-ZnO NCs indicates aluminum ions occupy the substitutional site in ZnO without distorting the wurtzite lattice. The excitonic feature for undoped ZnO NCs is observed at 373 nm. The monotonic blueshift from 373 (3.23 eV) nm to 363 (3.43 eV) nm in absorption edge with the increase in Al concentration is attributed to Moss-Burstein type shift. This further indicates the effect on the electron energy levels due to the substitutional incorporation of Al3+ ions in ZnO. DC electrical conductivity was measured for undoped ZnO and Al-ZnO NCs. The electrical conductivity for undoped ZnO NCs is found around 106 ohm-1m-1, whereas the conductivity is found to be improved with an increase in doping concentration of Al ions from 1 % to 5 %. The increase in charge carriers due to doping of Al ions is responsible for the enhancement in conductivity. Further increase in doping concentration leads to a drop in conductivity. The electrical conductivity is augmented by 102 times order of magnitude in the case of 5 % doping concentration. Therefore, these samples have potential use in optoelectronic devices, organic solar cells, photonic crystals, photo-detectors, light-emitting diodes (LEDs), gas sensors, and chemical sensors.

Keywords: Al doped ZnO Nanocrystals, Electrical conductivity, Microwave irradiation

Suggested Citation

Gawari, Baban and Kahane, Shital and Mahamuni, Shailaja, Significant Enhancement in Electrical Conductivity of Al doped ZnO Nanocrystals (February 25, 2022). Proceedings of the 3rd International Conference on Contents, Computing & Communication (ICCCC-2022), Available at SSRN: https://ssrn.com/abstract=4043424 or http://dx.doi.org/10.2139/ssrn.4043424

Baban Gawari

Gokhale Education Society’s, Arts, Commerce and Science College Jawhar, Palghar, India

India

Shital Kahane (Contact Author)

School of Physics, Dr. Vishwanath Karad MIT World Peace University, Pune, India

India

Shailaja Mahamuni

Department of Physics, Savitribai Phule Pune University, Pune, India

India

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