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Vol. 149, No. 2, February 2013, pp. 54-59

 

Bullet

 

Synthesis of Nanocrystalline ZnS Thin Films via Spray Pyrolysis for Optoelectronic Devices
 
F. Rahman, M. Zahan and * J. Podder

Department of Physics, Bangladesh University of Engineering and Technology,

Dhaka-1000, Bangladesh

Tel: +880-2-9665613, fax: +880-2-8613046

* E-mail: jpodder@phy.buet.ac.bd

 

 

Received: 7 December 2013   /Accepted: 14 February 2013   /Published: 28 February 2013

Digital Sensors and Sensor Sysstems

 

Abstract: ZnS thin films were deposited on the glass substrates at a temperature of 350 C by a low cost spray pyrolysis technique and annealed at 450 C and 550 C in a closed furnace. The as-deposited and annealed films were characterized by Energy Dispersive X-ray, X-ray Diffraction and UV-VIS spectrophotometer and dc conductivity by four probe van der Pauw method. The X-ray diffraction spectra of as-deposited films showed amorphous nature and after annealing at 450 C and 550 C the films were found polycrystalline nature with wurtzite hexagonal structure. The optical transmission spectra suggest that the fundamental absorption edge in the films is formed by the direct allowed transition. The optical band gap was decreased from 3.75 to 2.5 eV when the as-deposited films were annealed. The existing results of electrical conductivity and the activation energy reveal the semi-conducting behaviour of the samples.

 

Keywords: ZnS, Nano grains, Spray pyrolysis, X-ray diffraction, Band gap

 

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