Surface Equilibration Mechanism Controls the Stability of a Model Codeposited Glass Mixture of Organic Semiconductors

Cheng, Shinian; Lee, Yejung; Yu, Junguang; Yu, Lian; Ediger, M. D.

doi:10.1021/acs.jpclett.3c00728

Surface Equilibration Mechanism Controls the Stability of a Model Codeposited Glass Mixture of Organic Semiconductors

Journal Article · Tue May 02 00:00:00 EDT 2023 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.3c00728· OSTI ID:1985303

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University of Wisconsin, Madison, WI (United States); University of Wisconsin - Madison
University of Wisconsin, Madison, WI (United States)

While previous work has identified the conditions for preparing ultrastable single-component organic glasses by physical vapor deposition (PVD), little is known about the stability of codeposited mixtures. Here, we prepared binary PVD glasses of organic semiconductors, TPD (N,N'-Bis(3-methylphenyl)-N,N'-diphenylbenzidine) and m-MTDATA (4,4',4"-Tris[phenyl(m-tolyl)amino]triphenylamine), with a 50:50 mass concentration over a wide range of substrate temperatures (T_sub). The enthalpy and kinetic stability are evaluated with differential scanning calorimetry and spectroscopic ellipsometry. Binary organic semiconductor glasses with exceptional thermodynamic and kinetic stability comparable to the most stable single-component organic glasses are obtained when deposited at T_sub = 0.78–0.90T_g (where T_g is the conventional glass transition temperature). When deposited at 0.94T_g, the enthalpy of the m-MTDATA/TPD glass equals that expected for the equilibrium liquid at that temperature. Thus, the surface equilibration mechanism previously advanced for single-component PVD glasses is also applicable for these codeposited glasses. Furthermore, these results provide an avenue for designing high-performance organic electronic devices.

View Accepted Manuscript (DOE)

Research Organization:: University of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515; SC0002161

OSTI ID:: 1985303

Alternate ID(s):: OSTI ID: 2348912

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 18 Vol. 14; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Amorphous materials
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organic semiconductors
physical vapor deposition
stability
glasses

Surface Equilibration Mechanism Controls the Stability of a Model Codeposited Glass Mixture of Organic Semiconductors

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