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Title: Vapor-Deposited Glass Structure Determined by Deposition Rate–Substrate Temperature Superposition Principle

Abstract

In this article, we show that deposition rate substantially affects the anisotropic structure of thin glassy films produced by physical vapor deposition. Itraconazole, a glass-forming liquid crystal, was deposited at rates spanning 3 orders of magnitude over a 25 K range of substrate temperatures, and structure was characterized by ellipsometry and X-ray scattering. Both the molecular orientation and the spacing of the smectic layers obey deposition rate–substrate temperature superposition, such that lowering the deposition rate is equivalent to raising the substrate temperature. We identify two different surface relaxations that are responsible for structural order in the vapor-deposited glasses and find that the process controlling molecular orientation is accelerated by more than 3 orders of magnitude at the surface relative to the bulk. Finally, the identification of distinct surface processes responsible for anisotropic structural features in vapor-deposited glasses will enable more precise control over the structure of glassy materials used in organic electronics.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1546892
Grant/Contract Number:  
AC02-76SF00515; DMR-1720415
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 10; Journal Issue: 13; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Bishop, Camille, Gujral, Ankit, Toney, Michael F., Yu, Lian, and Ediger, Mark D. Vapor-Deposited Glass Structure Determined by Deposition Rate–Substrate Temperature Superposition Principle. United States: N. p., 2019. Web. doi:10.1021/acs.jpclett.9b01377.
Bishop, Camille, Gujral, Ankit, Toney, Michael F., Yu, Lian, & Ediger, Mark D. Vapor-Deposited Glass Structure Determined by Deposition Rate–Substrate Temperature Superposition Principle. United States. https://doi.org/10.1021/acs.jpclett.9b01377
Bishop, Camille, Gujral, Ankit, Toney, Michael F., Yu, Lian, and Ediger, Mark D. Sun . "Vapor-Deposited Glass Structure Determined by Deposition Rate–Substrate Temperature Superposition Principle". United States. https://doi.org/10.1021/acs.jpclett.9b01377. https://www.osti.gov/servlets/purl/1546892.
@article{osti_1546892,
title = {Vapor-Deposited Glass Structure Determined by Deposition Rate–Substrate Temperature Superposition Principle},
author = {Bishop, Camille and Gujral, Ankit and Toney, Michael F. and Yu, Lian and Ediger, Mark D.},
abstractNote = {In this article, we show that deposition rate substantially affects the anisotropic structure of thin glassy films produced by physical vapor deposition. Itraconazole, a glass-forming liquid crystal, was deposited at rates spanning 3 orders of magnitude over a 25 K range of substrate temperatures, and structure was characterized by ellipsometry and X-ray scattering. Both the molecular orientation and the spacing of the smectic layers obey deposition rate–substrate temperature superposition, such that lowering the deposition rate is equivalent to raising the substrate temperature. We identify two different surface relaxations that are responsible for structural order in the vapor-deposited glasses and find that the process controlling molecular orientation is accelerated by more than 3 orders of magnitude at the surface relative to the bulk. Finally, the identification of distinct surface processes responsible for anisotropic structural features in vapor-deposited glasses will enable more precise control over the structure of glassy materials used in organic electronics.},
doi = {10.1021/acs.jpclett.9b01377},
journal = {Journal of Physical Chemistry Letters},
number = 13,
volume = 10,
place = {United States},
year = {Sun Jun 09 00:00:00 EDT 2019},
month = {Sun Jun 09 00:00:00 EDT 2019}
}

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Cited by: 25 works
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