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Title: Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors

Abstract

High thermal stability and anisotropic molecular orientation enhance the performance of vapor-deposited organic semiconductors, but controlling these properties is a challenge in amorphous materials. To understand the influence of molecular shape on these properties, vapor-deposited glasses of three disk-shaped molecules were prepared. For all three systems, enhanced thermal stability is observed for glasses prepared over a wide range of substrate temperatures and anisotropic molecular orientation is observed at lower substrate temperatures. For two of the disk-shaped molecules, atomistic simulations of thin films were also performed and anisotropic molecular orientation was observed at the equilibrium liquid surface. We find that the structure and thermal stability of these vapor-deposited glasses results from high surface mobility and partial equilibration toward the structure of the equilibrium liquid surface during the deposition process. For the three molecules studied, molecular shape is a dominant factor in determining the anisotropy of vapor-deposited glasses.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]
  1. University of Wisconsin-Madison
  2. University of Chicago
Publication Date:
Research Org.:
University of Wisconsin-Madison University of Chicago
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1372474
DOE Contract Number:
SC0002161
Resource Type:
Data
Data Type:
Figures/Plots
Country of Publication:
United States
Availability:
University of Wisconsin-Madison
Language:
English
Subject:
36 MATERIALS SCIENCE; thermal stability; anisotropy; molecular orientation; thin film; organic semiconductor; vapor deposition

Citation Formats

Walters, Diane M, Antony, Lucas, de Pablo, Juan, and Ediger, Mark. Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors. United States: N. p., 2017. Web. doi:10.11578/1372474.
Walters, Diane M, Antony, Lucas, de Pablo, Juan, & Ediger, Mark. Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors. United States. doi:10.11578/1372474.
Walters, Diane M, Antony, Lucas, de Pablo, Juan, and Ediger, Mark. Tue . "Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors". United States. doi:10.11578/1372474. https://www.osti.gov/servlets/purl/1372474.
@article{osti_1372474,
title = {Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors},
author = {Walters, Diane M and Antony, Lucas and de Pablo, Juan and Ediger, Mark},
abstractNote = {High thermal stability and anisotropic molecular orientation enhance the performance of vapor-deposited organic semiconductors, but controlling these properties is a challenge in amorphous materials. To understand the influence of molecular shape on these properties, vapor-deposited glasses of three disk-shaped molecules were prepared. For all three systems, enhanced thermal stability is observed for glasses prepared over a wide range of substrate temperatures and anisotropic molecular orientation is observed at lower substrate temperatures. For two of the disk-shaped molecules, atomistic simulations of thin films were also performed and anisotropic molecular orientation was observed at the equilibrium liquid surface. We find that the structure and thermal stability of these vapor-deposited glasses results from high surface mobility and partial equilibration toward the structure of the equilibrium liquid surface during the deposition process. For the three molecules studied, molecular shape is a dominant factor in determining the anisotropy of vapor-deposited glasses.},
doi = {10.11578/1372474},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 25 00:00:00 EDT 2017},
month = {Tue Jul 25 00:00:00 EDT 2017}
}

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