Preparation of tin oxide films on various substrates by excimer laser metal organic deposition

Tin oxide (SnO2) thin films were prepared on various substrates by the excimer laser metal organic deposition (ELMOD) and the thermal metal organic deposition (MOD) processes. When the amorphous SnO2 film prepared at 300 8C on (1 0 0) Si, and (1 0 1 0) sapphire substrates was irradiated by the KrF excimer laser at a fluence of 200 mJ/cm2 and 25 8C, polycrystalline SnO2 films were obtained. When the amorphous SnO2 film prepared at 300 8C on the (1 0 0) SrTiO3 and (1 0 0) TiO2 substrates was irradiated by the KrF excimer laser at the same conditions, a (1 1 0) oriented SnO2 film on the SrTiO3 substrate and a (1 0 0) oriented SnO2 film on the TiO2 substrate were obtained. Using the pole–figure measurements, a SnO2 film on TiO2 substrate was found to be epitaxially grown. On the other hand, when a thermalMODprocess was used, all the product films on their substrates were of the polycrystalline phase whereas the orientation of the films depended on the substrate. Polycrystalline and epitaxial growth of the SnO2 films by the ELMOD process are also discussed.