PBS FILMS CHEMICALLY DEPOSITED ON A GLASS SUPPORT OPTICAL-PROPERTIES

This paper presents the results of our studies on PbS deposition on gl ass from a source made up of a lead salt and thiourea, in the presence of either hydrogen peroxide, or complexing agents (i.e. triethanolami ne, ethylenediamine, EDTA and sodium citrate), correlated with their o ptical properties. When working in hydrogen peroxide medium PbS films were deposited, having VIS transmission of 10-85% and NIR reflexion of up to 45%; this confirms the possibility of using these films as sola r radiation selective filters, avoiding the overheating of the dwellin gs and cars in the hot climate countries. The VIS transmission decreas es with the deposition time, with the number of layers deposited and w ith the film trickness. The NIR reflexion reaches up to 45% and grows with the above mentioned parameters. The film thickness varies in the range 0,01-0,06 mu m. The glass support thickness does not influence t he film optical properties. Among the results got with the complexing agents used, the best was the one obtained with triethanolamine.