Nanotechnology and nanomaterials

Effects  of thickness on the properties of ZnO doped Mn Thin Films grown by Sol-Gel spin coating deposition.
A. Boukhari1 , A. Mahroug1,2, B. Deghfel1,2, R. Amari1, N.Selmi3
1Department of Physics, Faculty of Sciences(Technology), University of Mohamed Boudiaf, 28000 M’sila, Algeria
E-mail: ammar.boukhari@gmail.com 
2 Laboratory of materials physics and its applications, Department of Physics, Faculty of Sciences, University of Mohamed Boudiaf, 28000 M’sila, Algeria    
 3 Nuclear Research Center of Birine, Ain Oussera Box 180, Algeria                                                                                                                       

          In this study, Mn doped ZnO thin films with different thicknesses were deposited on glass substrate by using sol–gel spin coating method at 0,7 ZnO concentration in order to investigate the thickness effect on structural, morphological, electronical and optical properties. XRD results exhibit that all deposited thin films have a hexagonal wurtzite structure with a preferential orientation along to c(0 0 2)-axis. The grain size, lattice constants, FWHM and strain in films were found to be influenced by the thin film thickness [1]. To characterize the electronic and optical properties, UV-Vis spectra and photoluminescence (PL) spectra were used. The results indicate that the transmittance decreases with increasing the film thickness [2], and all samples show generally a transmission lower than 44% in the visible range. With increasing the film thickness, the optical band gap energy was found to be decreased [3]. PL spectra for Mn doped ZnO films shows a UV peak at 388 nm and tow blue–green band in the range 436- 525 nm.
1.	Karmakar R., Neogi S. K., Banerjee A. ,Bandyopadhyay S. Structural ; morphological ; optical and magnetic properties of Mn doped ferromagnetic ZnO thin film//Appl. Surf. Sci.-2012.- 263 p 671–677.
2.	Venkaiah M. , Singh R. Superlattices and Microstructures Effect of thickness on structural , optical and mechanical properties of Mn doped ZnO nanocrystalline thin films RF sputtered in nitrogen gas environment//Superlattices Microstruct. -2014. -72 p 164–171.
3.	Rajalakshmi R., Angappane S. Effect of thickness on the structural and optical properties of sputtered ZnO and ZnO:Mn thin films// Journal of Alloys and Compounds. -2014. -615 p 355–362.