Limiting Steps at Low Temperature in Direct Writing of Al on Si From Tma

Abstract

ABSTRACTThe rates of aluminum line growth, assisted by photolysis, in the normal direction to the Si (100) substrate, indicate that, in a trimethyl-aluminum + hydrogen mixture, only the change in the TMA flux and the UV laser power can play a determinant role. Possible explanation is based on the generated methyl radical “blocking” action leading to a self-limiting deposition rate, as opposed to the enhancement of methyl desorption by hydrogenation to methane. It is shown that dilution by hydrogen decreases the carbon contamination in aluminum line.