Mr. Anush Singhal Profile

Anush Singhal

at Georgia Institute of Technology

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Proceedings Article | 1 October 2023 Presentation

Leveraging thermotropic order to control photophysical response in PBTTT

Mark Weber, Anush Singhal, Teerapat Lapsirivatkul, Carlos Silva, Natalie Stingelin

Proceedings Volume PC12660, PC126600B (2023) https://doi.org/10.1117/12.2683032

KEYWORDS: Polymers, Liquids, Liquid crystals, Crystals, Semiconductors, Anisotropy, X-rays, Vacuum, Solid state physics, Solid state electronics

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In recent years, hairy rod semiconducting polymers have risen to the forefront of organic electronic implementations for, among other factors, their desirable photophysical properties. Departing from conventional semiflexible polymers, the newer generation of materials have increased backbone rigidity. This evokes the question of how increasing rigidity manifests in the photophysical response of these materials. Herein, we use solid-state vacuum compression molding to induce elusive liquid crystallinity in quintessential thermotropic Poly[2,5-bis(3-dodecylthiophen-2-yl)thieno[3,2-b]thiophene], PBTTT. By means of conventional and fast calorimetry, we elucidate the changes in phase behavior of solution processed PBTTT upon solid-state compression. Furthermore, anisotropy, associated with liquid crystallinity, is observed through transmission X-ray scattering. The shift towards increased anisotropy strongly influences the photophysical aggregation of transition dipole moments as it determines the local ordering of chromophores. We probe the optical response as a function of temperature to determine dominant aggregation states and further exemplify local ordering. This work provides a framework for controlling photophysical response in thermotropic or liquid crystalline-like polymer semiconductors by means of processing.

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