DISPLACEMENT DEPOSITION OF SN FROM FLUORIDE SOLUTIONS ON PD PREDEPOSITED (100)SI SUBSTRATE

Displacement deposition of tin on Si from fluoride solutions results o nly in small scattered grains on the surface. However, deposition on a Pd predeposited Si substrate greatly increases the amount of deposite d tin. Using morphological and chemical surface analysis, we conclude that Sn deposition occurs on the surface of the substrate placed in be tween the previously deposited Pd grains. Depending on the distributio n of the Pd nuclei on the substrate, a complete surface coverage by na nometric particles of metallic tin can be achieved.