Person:
Davis, Luke

Profile Picture

Email Address

AA Acceptance Date

Birth Date

Research Projects

Organizational Units

Job Title

Last Name

Davis

First Name

Luke

Name

Davis, Luke

Filters

2016 - 20172

Settings

Author's Publications: search.filters.isAuthorOfPublication.40da4b9e-e4b2-40ad-9755-bc78ed08e068

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Publication
    Vapor deposition of copper(I) bromide films via a two-step conversion process
    (American Vacuum Society, 2017) Heasley, Rachel Lenox; Chang, Christina; Davis, Luke; Liu, Kathy; Gordon, Roy
    Thin films of Cu2S grown by pulsed-chemical vapor deposition of bis(N,N'-di-secbutylacetamidinato)dicopper(I) and hydrogen sulfide were converted to CuBr upon exposure to anhydrous hydrogen bromide. X-ray diffraction shows that the as-deposited films have a polycrystalline Cu2S structure. After exposure to HBr gas, the surface of the films is transformed to a γ-CuBr polycrystalline structure. Scanning electron microscopy and X-ray photoelectron spectroscopy reveal complete conversion of up to 100 nm of film. However, when the conversion to CuBr approaches the interface between as-deposited Cu2S and the SiO2 substrate, the morphology of the film changes from continuous and nanocrystalline to sparse and microcrystalline.
  • Thumbnail Image
    Publication
    Synthesis of Calcium(II) Amidinate Precursors for Atomic Layer Deposition through a Redox Reaction between Calcium and Amidines
    (John Wiley and Sons Inc., 2016) Kim, Sang Bok; Yang, Chuanxi; Powers, Tamara; Davis, Luke; Lou, Xiabing; Gordon, Roy
    Abstract We have prepared two new CaII amidinates, which comprise a new class of ALD precursors. The syntheses proceed by a direct reaction between Ca metal and the amidine ligands in the presence of ammonia. Bis(N,N′‐diisopropylformamidinato)calcium(II) (1) and bis(N,N′‐diisopropylacetamidinato)calcium(II) (2) adopt dimeric structures in solution and in the solid state. X‐ray crystallography revealed asymmetry in one of the bridging ligands to afford the structure [(η2‐L)Ca(μ‐η2:η2‐L)(μ‐η2:η1‐L)Ca(η2‐L)]. These amidinate complexes showed unprecedentedly high volatility as compared to the widely employed and commercially available CaII precursor, [Ca3(tmhd)6]. In CaS ALD with 1 and H2S, the ALD window was approximately two times wider and lower in temperature by about 150 °C than previously reported with [Ca3(tmhd)6] and H2S. Complexes 1 and 2, with their excellent volatility and thermal stability (up to at least 350 °C), are the first homoleptic CaII amidinates suitable for use as ALD precursors.