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Journal Articles The Journal of Chemical Physics Year : 2023

Vapor-to-glass preparation of biaxially aligned organic semiconductors

Debaditya Chatterjee
Paul Voyles
Harald Bock
Mark Ediger

Abstract

Physical vapor deposition (PVD) provides a route to prepare highly stable and anisotropic organic glasses that are utilized in multi-layer structures such as organic light-emitting devices. While previous work has demonstrated that anisotropic glasses with uniaxial symmetry can be prepared by PVD, here, we prepare biaxially aligned glasses in which molecular orientation has a preferred in-plane direction. With the collective effect of the surface equilibration mechanism and template growth on an aligned substrate, macroscopic biaxial alignment is achieved in depositions as much as 180 K below the clearing point TLC−iso (and 50 K below the glass transition temperature Tg) with single-component disk-like (phenanthroperylene ester) and rod-like (itraconazole) mesogens. The preparation of biaxially aligned organic semiconductors adds a new dimension of structural control for vapor-deposited glasses and may enable polarized emission and in-plane control of charge mobility.
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hal-04537659 , version 1 (08-04-2024)

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Jianzhu Ju, Debaditya Chatterjee, Paul Voyles, Harald Bock, Mark Ediger. Vapor-to-glass preparation of biaxially aligned organic semiconductors. The Journal of Chemical Physics, 2023, 159 (21), pp.211101. ⟨10.1063/5.0174819⟩. ⟨hal-04537659⟩
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