Influence of Vapor Deposition on Structural and Charge Transport Properties of Ethylbenzene Films
Abstract
Organic glass films formed by physical vapor deposition exhibit enhanced stability relative to those formed by conventional liquid cooling and aging techniques. Recently, experimental and computational evidence has emerged indicating that the average molecular orientation can be tuned by controlling the substrate temperature at which these "stable glasses" are grown. In this work, we present a comprehensive all-atom simulation study of ethylbenzene, a canonical stable-glass former, using a computational film formation procedure that closely mimics the vapor deposition process. Atomistic studies of experimentally formed vapor deposited glasses have not been performed before, and this study therefore begins by verifying that the model and method utilized here reproduces key structural features observed experimentally. Having established agreement between several simulated and experimental macroscopic observables, simulations are used to examine the substrate temperature dependence of molecular orientation. The results indicate that ethylbenzene glasses are anisotropic, depending upon substrate temperature, and that this dependence can be understood from the orientation present at the surface of the equilibrium liquid. By treating ethylbenzene as a simple model for molecular semiconducting materials, a quantum-chemical analysis is then used to show that the vapor-deposited glasses exhibit decreased energetic disorder and increased magnitude of the mean-squared transfer integral relativemore »
- Authors:
-
- Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States, The Institute for Molecular Engineering, Argonne National Laboratory, Lemont, Illinois 06349, United States
- Advanced Leadership Computing Facility, Argonne National Laboratory, Lemont, Illinois 06349, United States
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1351665
- Alternate Identifier(s):
- OSTI ID: 1369460; OSTI ID: 1393175
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- ACS Central Science
- Additional Journal Information:
- Journal Name: ACS Central Science Journal Volume: 3 Journal Issue: 5; Journal ID: ISSN 2374-7943
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Antony, Lucas W., Jackson, Nicholas E., Lyubimov, Ivan, Vishwanath, Venkatram, Ediger, Mark D., and de Pablo, Juan J. Influence of Vapor Deposition on Structural and Charge Transport Properties of Ethylbenzene Films. United States: N. p., 2017.
Web. doi:10.1021/acscentsci.7b00041.
Antony, Lucas W., Jackson, Nicholas E., Lyubimov, Ivan, Vishwanath, Venkatram, Ediger, Mark D., & de Pablo, Juan J. Influence of Vapor Deposition on Structural and Charge Transport Properties of Ethylbenzene Films. United States. https://doi.org/10.1021/acscentsci.7b00041
Antony, Lucas W., Jackson, Nicholas E., Lyubimov, Ivan, Vishwanath, Venkatram, Ediger, Mark D., and de Pablo, Juan J. Fri .
"Influence of Vapor Deposition on Structural and Charge Transport Properties of Ethylbenzene Films". United States. https://doi.org/10.1021/acscentsci.7b00041.
@article{osti_1351665,
title = {Influence of Vapor Deposition on Structural and Charge Transport Properties of Ethylbenzene Films},
author = {Antony, Lucas W. and Jackson, Nicholas E. and Lyubimov, Ivan and Vishwanath, Venkatram and Ediger, Mark D. and de Pablo, Juan J.},
abstractNote = {Organic glass films formed by physical vapor deposition exhibit enhanced stability relative to those formed by conventional liquid cooling and aging techniques. Recently, experimental and computational evidence has emerged indicating that the average molecular orientation can be tuned by controlling the substrate temperature at which these "stable glasses" are grown. In this work, we present a comprehensive all-atom simulation study of ethylbenzene, a canonical stable-glass former, using a computational film formation procedure that closely mimics the vapor deposition process. Atomistic studies of experimentally formed vapor deposited glasses have not been performed before, and this study therefore begins by verifying that the model and method utilized here reproduces key structural features observed experimentally. Having established agreement between several simulated and experimental macroscopic observables, simulations are used to examine the substrate temperature dependence of molecular orientation. The results indicate that ethylbenzene glasses are anisotropic, depending upon substrate temperature, and that this dependence can be understood from the orientation present at the surface of the equilibrium liquid. By treating ethylbenzene as a simple model for molecular semiconducting materials, a quantum-chemical analysis is then used to show that the vapor-deposited glasses exhibit decreased energetic disorder and increased magnitude of the mean-squared transfer integral relative to isotropic, liquid-cooled films, an effect that is attributed to the anisotropic ordering of the molecular film. These results suggest a novel structure function simulation strategy capable of tuning the electronic properties of organic semiconducting glasses prior to experimental deposition, which could have considerable potential for organic electronic materials design.},
doi = {10.1021/acscentsci.7b00041},
journal = {ACS Central Science},
number = 5,
volume = 3,
place = {United States},
year = {Fri Apr 14 00:00:00 EDT 2017},
month = {Fri Apr 14 00:00:00 EDT 2017}
}
https://doi.org/10.1021/acscentsci.7b00041
Web of Science
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