Origin of Anisotropic Molecular Packing in Vapor-Deposited Alq3 Glasses
Abstract
Anisotropic molecular packing is a key feature that makes glasses prepared by physical vapor deposition (PVD) unique materials, warranting a mechanistic understanding of how a PVD glass attains its structure. To this end, we use X-ray scattering and ellipsometry to characterize the structure of PVD glasses of tris(8-hydroxyquinoline) aluminum (Alq3), a molecule used in organic electronics, and compare our results to simulations of its supercooled liquid. X-ray scattering reveals a tendency for molecular layering in Alq3 glasses that depends upon the substrate temperature during deposition and the deposition rate. Simulations reveal that the Alq3 supercooled liquid, like liquid metals, exhibits surface layering. We propose that the layering in Alq3 glasses observed here as well as the previously reported bulk dipole orientation are inherited from the surface structure of the supercooled liquid. This work significantly advances our understanding of the mechanism governing the formation of anisotropic structure in PVD glasses.
- Authors:
-
[1];
[2];
[1];
[3];
[4];
[2];
[1]
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemistry
- Univ. of Chicago, IL (United States). Inst. for Molecular Engineering; Argonne National Lab. (ANL), Argonne, IL (United States). Inst. for Molecular Engineering
- Univ. of Wisconsin, Madison, WI (United States). School of Pharmacy
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1503560
- Alternate Identifier(s):
- OSTI ID: 1493709
- Grant/Contract Number:
- AC02-76SF00515; SC0002161; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry Letters
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 2; Journal ID: ISSN 1948-7185
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Bagchi, Kushal, Jackson, Nicholas E., Gujral, Ankit, Huang, Chengbin, Toney, Michael F., Yu, Lian, de Pablo, Juan J., and Ediger, M. D. Origin of Anisotropic Molecular Packing in Vapor-Deposited Alq3 Glasses. United States: N. p., 2018.
Web. doi:10.1021/acs.jpclett.8b03582.
Bagchi, Kushal, Jackson, Nicholas E., Gujral, Ankit, Huang, Chengbin, Toney, Michael F., Yu, Lian, de Pablo, Juan J., & Ediger, M. D. Origin of Anisotropic Molecular Packing in Vapor-Deposited Alq3 Glasses. United States. https://doi.org/10.1021/acs.jpclett.8b03582
Bagchi, Kushal, Jackson, Nicholas E., Gujral, Ankit, Huang, Chengbin, Toney, Michael F., Yu, Lian, de Pablo, Juan J., and Ediger, M. D. Mon .
"Origin of Anisotropic Molecular Packing in Vapor-Deposited Alq3 Glasses". United States. https://doi.org/10.1021/acs.jpclett.8b03582. https://www.osti.gov/servlets/purl/1503560.
@article{osti_1503560,
title = {Origin of Anisotropic Molecular Packing in Vapor-Deposited Alq3 Glasses},
author = {Bagchi, Kushal and Jackson, Nicholas E. and Gujral, Ankit and Huang, Chengbin and Toney, Michael F. and Yu, Lian and de Pablo, Juan J. and Ediger, M. D.},
abstractNote = {Anisotropic molecular packing is a key feature that makes glasses prepared by physical vapor deposition (PVD) unique materials, warranting a mechanistic understanding of how a PVD glass attains its structure. To this end, we use X-ray scattering and ellipsometry to characterize the structure of PVD glasses of tris(8-hydroxyquinoline) aluminum (Alq3), a molecule used in organic electronics, and compare our results to simulations of its supercooled liquid. X-ray scattering reveals a tendency for molecular layering in Alq3 glasses that depends upon the substrate temperature during deposition and the deposition rate. Simulations reveal that the Alq3 supercooled liquid, like liquid metals, exhibits surface layering. We propose that the layering in Alq3 glasses observed here as well as the previously reported bulk dipole orientation are inherited from the surface structure of the supercooled liquid. This work significantly advances our understanding of the mechanism governing the formation of anisotropic structure in PVD glasses.},
doi = {10.1021/acs.jpclett.8b03582},
journal = {Journal of Physical Chemistry Letters},
number = 2,
volume = 10,
place = {United States},
year = {Mon Dec 24 00:00:00 EST 2018},
month = {Mon Dec 24 00:00:00 EST 2018}
}
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