Undoped and Sn-doped ZnO films are deposited on glass substrates using a sol-gel spin coating technique with a doping concentration varying from 0% to 3 mol. The effects of Sn doping concentration on surface morphology, structural and optical properties of the ZnO films are investigated using scanning electron microscopy, an X-ray diffractometer and a UV-Vis-NIR system. | JOURNAL OF SCIENCE OF HNUE DOI Mathematical and Physical Sci. 2015 Vol. 60 No. 7 pp. 41-46 This paper is available online at http INFLUENCES OF Sn DOPING CONCENTRATION ON CHARACTERISTICS OF ZnO FILMS FOR SOLAR CELL APPLICATIONS Nguyen Dinh Lam Le Thuy Trang Nguyen Thi Mui Pham Van Vinh Vuong Van Cuong and Nguyen Van Hung Faculty of Physics Hanoi National University of Education Abstract. Undoped and Sn-doped ZnO films are deposited on glass substrates using a sol-gel spin coating technique with a doping concentration varying from 0 to 3 mol . The effects of Sn doping concentration on surface morphology structural and optical properties of the ZnO films are investigated using scanning electron microscopy an X-ray diffractometer and a UV-Vis-NIR system. As the Sn doping concentration increases the ZnO films have a preferential orientation along the 002 direction and the crystalline particle size becomes bigger. Average optical transmittances of all fabricated films are higher than 95 in the visible range. The optical bandgap energy of the films is enlarged by introducing Sn dopant. Keywords ZnO sol-gel spin coating Sn-doped solar cell applications. 1. Introduction ZnO films is one of promising candidate for sensitized solar cell application because of its unique properties such as non-toxicity high optical transparency in the visible region high surface activities chemical inertia and it s also an economical material 1-9 . In order to fulfill requirement of this application ZnO thin films must be modified with regards to its electrical structural and optical properties. Many techniques are used to modify characteristics of ZnO films and introducing another element in the ZnO structure by means of a doping process is a very useful one 10-14 . ZnO films can be deposited onto substrates using techniques such as pulsed laser deposition RF sputtering chemical vapor deposition spray pyrolysis and sol-gel spin coating 15-19 . .
