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This paper discusses recent advances in the study of solid surfaces by contact angle measurements which appeared promising in developing a technique to characterize different types of amorphous or polycrystalline metal and oxide surfaces. The extent to which contact angle measurements and spreading‐pressure values can be used to characterize various silica surfaces is explored. A practical scheme is offered using water and an organic solvent to characterize various silica surfaces in a simple and nondestructive manner.

A compilation of data on solder glasses from the literature is presented. Sources are: Chemical Abstracts, Ceramic Abstracts, Abstracts in Physics and Chemistry of Glasses, and pertinent books. Even though not exhaustive, domestic and foreign sources are included.

This study shows that the damage observed in silicon slices after exposure to reactive ion etching in a hydrogen containing plasma is caused by physical bombardment of the surface by hydrogen ions. This conclusion is based primarily on extensive measurements of retention time, Rutherford backscattering, and Auger analysis data. When the etch gas is a mixture of CF4 and H2, hydrogen ions are implanted into the silicon surface to an approximate depth of 200~. Because the etch rate of silicon in CF4/H2 is slow, any resulting surface damage due to this plasma increases faster than can be removed by a fast silicon etch, like CF4 alone. However, the damaged layer can readily be removed by any dry or wet etching agent. Metal oxide semiconductor (MOS) measurements of charge retention indicate that an exposure to hydrogen containing plasmas for less than 5 min does not degrade the silicon surface sufficiently to be of concern for device fabrication on VLSI. Good product yields have been fabricated with a plasma that contains hydrogen.

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