Control of Reaction Surface in Low Temperature CVD to Enhance Nucleation and Conformal Coverage

The Holy Grail in CVD community is to find precursors that can afford the following: good nucleation on a desired substrate and conformal deposition in high AR features. Good nucleation is not only necessary for getting ultra-thin films at low thicknesses; it also offers films that are smooth at higher thickness values. On the other hand, conformal deposition enables uniform film coating on 3D structures. These two properties would meet the demands from most of the technology. However, it turns out that most growth precursor molecules can not fulfill both the requirements. For good nucleation characteristics, it is required that the precursor has a high sticking probability on the substrate, whereas, for conformal deposition, the sticking probability of the precursor molecule on the growth surface has to be lower. Therefore, to achieve both of these characteristics, it is imperative to control the reaction surface. My research is focused on finding methods to change the growth surface adequately, so as to render good nucleation properties by enhancing sticking probability during nucleation stage, and to decrease the sticking probability during growth, for conformal deposition. A combination of these can fulfill most of the future technological requirements. I have developed a new way of nucleation enhancement: by activating the surface with remote noble gas plasma. Conformality enhancement is achieved by use of growth inhibitors that lower the sticking probability of the molecules impinging the growth surface.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Kumar, Navneet

Contributors dc:contributor

• Abelson, John R.

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI3392103

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82857