International Science Community Association Research Journal of Chemical Sciences 2231 - 606X 5 10 2015 October 18 Effect of Substrate Temperature on Structural and Optical Properties of Cu2ZnSnS4 (CZTS) Films Prepared by Chemical Spray Pyrolysis Method 51 60 EN Shinde V.G. 1 * Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, 431004, MH, INDIA Ingale V.D. 2 RajbhojA.S. 3 Gaikwad S.T. 4 Runde M. 1 Department of Chemistry, Modibbo Adama University of Technology Yola Adamawa State, NIGERIA KubmarawaD. 2 Maina H.M. 3 Diedhiou Djibril 1 Laboratoire de Chimie Agro-Industrielle (LCA), ENSIACET, INP Toulouse, 4 Allée Emile Monso - BP 44362 - 31030 Toulouse Cedex 4, FRANCE Laboratoire d’Electrochimie et des Procédés Membranaires (LEPM), Université Cheikh Anta Diop de Dakar, BP 5085 Dakar-fann, SENEGAL DiattaMamadou Lamine 2 Faye Mamadou 3 Vilarem Gerard 4 SockOumar 5 Rigal Luc 6 ShamsaAl Sadi 1 Caledonian Centre for Creativity and Innovation, Caledonian College of Engineering, OMAN Mechanical and Industrial Engineering Department, Caledonian College of Engineering, OMAN Geetha Devi.M 2 MurtuzaAli Syed 3 Feroz.S 4 Varghese. M.J. 5 Ansari Anjum 1 1*Applied Chemistry Department, UIT, BU, Bhopal- 462026, INDIA Mechanical Engineering Department, UIT, BU, Bhopal- 462026, INDIA RajvaidyaRohit 2 Amlathe Sulbha 3 Vaidya Rohit 1 3 Department of Chemical Engineering, BITS Pilani Dubai Campus, P.O. Box 345055, Academic City, Dubai, UAE Department of General Sciences, BITS Pilani Dubai Campus, P.O. Box 345055, Academic City, Dubai, UAE Department of Mechanical Engineering, BITS Pilani Dubai Campus, P.O. Box 345055, Academic City, Dubai, UAE KarthiyayiniS. 2 Millerjothi N.K. 3 RanBahadur Yadav 1 Applied Chemistry Department, Faculty of Technology and Engineering, Kalabhavan, The Maharaja Sayajirao University of Baroda, Vadodara- 390001, INDIA NabeelA. Bakr* 1 Department of Physics, College of Science, University of Diyala, Diyala, IRAQ ZiadT.Khodair 2 ShahlaaM.Abdul Hassan 3 > Research Paper 2015 10 2nd 2015 October 18 In this work Copper zinc tin sulfide (CZTS) films were prepared by using chemical spray pyrolysis technique. Copper chloride CuCl, Zinc chloride ZnCl, Tin chloride pentahydrate SnCl.5HO and Thiourea SC(NH were used as sources of Copper ions, Zinc ions, Tin ions and Sulfur ions respectively. CZTS thin films have been grown on clean preheated glass at different substrate temperatures of (200, 250, 300, 350, 400 and 450) C. The structural and optical properties of these films have been studied using XRD, AFM, and UV-Visible spectroscopy. The XRD results showed that all films are polycrystalline in nature with tetragonal structure and preferred orientation along (112) plane. The crystallite size was calculated using Scherrer’s formula and it is found that the CZTS thin films have maximum crystallite size of (34.401 nm) at substrate temperature of 450 C. Williamson-Hall analysis was carried out for all samples and the crystallite size along with microstrains were estimated. AFM results showed homogenous and smooth thin films. The absorbance and transmittance spectra have been recorded in the wavelength range of (300- 900) nm in order to study the optical properties. The optical energy gap for allowed direct electronic transition was calculated using Tauc’s equation. It is found that the band gap decreases as the substrate temperature increases and the optical allowed energy gap for the direct electronic transitions was in the range of (2.3 -1.85) eV. Urbach energy values range between (477 - 643) meV. The optical constants including absorption coefficient, real and imaginary parts of dielectric constant were also calculated as a function of photon energy. Refractive index and extinction coefficient were estimated as a function of wavelength. Copyright@ International Science Community Association