Hyperfine Interactions 41 (1988) 713-716 713 A MOSSBAUER INVESTIGATION OF SnO2FILMS WITH PREFERRED ORIENTATION OF CRYSTALLITES* H. TANG, R. LIU, H. ZHOU and Y. HSIA Department of Physics, Nanjing University, Nanjin~ China Y. CHEN, C. NIU and X. FU. Department of Chem~try, Nanjing University, Nanjin~ China The textured SnO2 films with different thickness in the range of 600-11200~ prepared by chemical vapour deposition (CVD) have been characterized by using conversion electron~ssbauer spec- troscopy(Cl~dS) couping with X-ray diffraction(XRD) and Auger electron spectroscopy(AES).The evidence for the existence of an interaction between SnO2 and glass substrate with the formation of a interface" layer about 200A thick has been d iscussed.SnO 2 existing in polycrystalline state with preferred crystal face orientation is found as long as the SnO2 films are thick than lsooA. i. Introduction Transparent oonductive SnO2 films have been found increasing applications, such as, electrodes in liquid crystal displays, windows in heterojunction solar cells, gates in chargeooupled device imagers and electrical heater for windsh~.eld de-icers. The optical and electrical properties of the films are strongly dependent on their crystal structure,crystallographic orientation and morphology. C~4S method provides a nondestructive technique to investigate the properties of SnO2 thin films. In this work, ~ combined with XRD and AES is employed to study textured SnO 2 films prepared by CUD. '- 2. Experiment and results 2.1 Preparation of the SnO2 films The SnO2 films were prepared by CVD as described elsewhere/i/. In short, through the reaction of stannic chloride vapour carring by Nitrogen with water vapour at 450~ SnO2d,films were formed on pyrex glass substrates. The correlation between the reaction time and the thichness of the film is shown in Fig. i. 2.2 C~MS meas~t The CI~MS meas~ts were performed with a i0 mCi Ball9snO3 source u~ing a He/CH4 filled proportional detector. A typical C~4S spectrum is shown in Fig. 2. * The project supported by National Natural Science Foundation of China. 9 J.C. Baltzer A.G., Scientific Publishing Company