In semiconductor device fabrication, the various processing steps fall into four general categories: deposition, removal, patterning, and modification of electrical properties. Deposition is any process that grows, coats, or otherwise transfers a material onto the wafer. Available technologies consist of physical vapor deposition (PVD), chemical vapor deposition (CVD), electrochemical deposition (ECD), molecular beam epitaxy (MBE) and more recently, atomic layer deposition (ALD) among others.
precipitously adv 1: very suddenly and to a great degree; conditions that precipitously increase the birthrate; prices rose sharply [syn: precipitously, sharply] 2: abruptly; in a precipitous manner; the mountains rose precipitously from the shore
In chemistry, a precipitate is an insoluble solid that emerges from a liquid solution. The emergence of the insoluble solid from solution is called precipitation. Often the precipitate emerges as a suspension. Precipitates can form when two soluble salts react in solution to form one or more insoluble products. soluble salt 1 + soluble salt 2 â insoluble salt (precipitate) Apple juice is improved by removal of undesirable substances as a precipitate.