Optical and electrical characterization of AgInS2 thin films deposited by spray pyrolysis.

Silver indium sulfide (AgInS2) thin films have been prepared by spray pyrolysis (SP) technique using silver acetate, indium acetate, and N, N-dimethylthiourea as precursor compounds. Films were deposited onto glass substrates at different substrate temperatures (Ts) and Ag:In:S ratios in the starting solutions. Optical transmission and reflection as well as electrical measurements were performed in order to study the effect of deposition parameters on the optical and electrical properties of AgInS2 thin films. X-ray diffraction measurements were used to identify the deposited compounds. It was found that different compounds such as AgInS2, Ag2S, In2O3, and In2S3 can be grown only by changing the Ag:In:S ratio in the starting solution and Ts. So that, by carefully selecting the deposition parameters, single phase AgInS2 thin films can be easily grown. Thin films obtained using a molar ratio of Ag:In:S = 1:1:2 and Ts = 400 ◦C, have an optical band gap of 1.9 eV and n-type electrical conductivity with a value of 0.3 −1 cm−1 in the dark

Contribution a l'elaboration et a la caracterisation des oxydes semiconducteurs transparents en couche mince obtenus par pyrolyse d'un aerosol genere par ultasons : l'oxyde de zinc dope a l'indium

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Microstructural Effects of Sn Addition to Fe(2)O(3) Thin Films

The influence of Sri in Fe(2)O(3) thin films is addressed. The presence of the tin ions decreases the Fe(2)O(3) particle sizes and surface roughness decreasing of the films` surface is observed as a consequence. X-ray diffraction and atomic force microscopy measurements together with literature results support this phenomenon to be related to the segregation of the additive onto the surface and consequently surface energy decrease, which constitutes the driving force for the microstructure modification, similarly to results previously obtained for powders with same compositions. The effect of the anions introduced in the system as counter-ions of the precursors is also discussed