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Title:Growth of epitaxial nanoscale columnar copper indium diselinide thin films by introduction of sodium flouride during growth
Author(s):Kardel, Justin Tynes
Advisor(s):Rockett, Angus A
Department / Program:Materials Science & Engineerng
Discipline:Materials Science & Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):CuInSe2 (CIS)
Copper indium gallium diselinide (CIGS)
Thin Films
Epitaxy
Nanostructures
Nanowires
Abstract:The effect of NaF on the growth of CuInSe2 (CIS) epitaxial thin films by a hybrid sputtering and evaporation method was studied. Low levels of NaF deposition during interruptions of epitaxial growth reduced surface roughness. Larger amounts of NaF resulted in columnar epitaxial films with <112> surface facets on the sides of the columns. X-ray diffraction shows all films to be largely epitaxial, with small amounts of (301)-surface-oriented CIS grains present in films with the highest NaF addition. In the columnar films, a buildup of Na was seen near the substrate/film interface, suggesting that Na is buried during columnar growth. I conclude that the Na plays an integral role in the creation of columns in the films based on the dose of Na added during growth. A mechanism for the transition to growth of columns with critical concentrations of NaF is proposed.
Issue Date:2016-07-27
Type:Thesis
URI:http://hdl.handle.net/2142/92674
Rights Information:Copyright 2016 Justin Kardel
Date Available in IDEALS:2016-11-10
Date Deposited:2016-08


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