Area-selective atomic layer deposition of high-quality Ru thin films by chemo-selective adsorption of short alkylating agents

Abstract

We report the effects of surface modification by vapor dosing of (N,N-diethylamino)trimethylsilane (DEATMS) molecules as short alkylating agents on technologically important substrates of Si, SiO2, TiN, and W. In this study, tricarbonyl(trimethylenemethane) ruthenium [Ru(TMM)(CO)3] was employed as a metal-organic pre-cursor for atomic layer deposition (ALD) of Ru, which produced high-quality Ru films with significantly low resistivity and high growth -per-cycle. Through surface modification of vapor-dosed DEATMS molecules, signif-icant growth retardation against the ALD Ru process was selectively found on SiO2 and TiN in contrast to Si(-H) and W substrates. With applying chemo-selectively inhibitory characteristics, we successfully demonstrate area selective deposition of ALD Ru films on a patterned TiN/Si substrate.