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Ultrasound-Induced Ordering in Poly(3-hexylthiophene): Role of Molecular and Process Parameters on Morphology and Charge Transport

Title
Ultrasound-Induced Ordering in Poly(3-hexylthiophene): Role of Molecular and Process Parameters on Morphology and Charge Transport
Authors
Aiyar, AR[Aiyar, Avishek R.]Hong, JI[Hong, Jung-Il]Izumi, J[Izumi, Jessica]Choi, D[Choi, Dalsu]Kleinhenz, N[Kleinhenz, Nabil]Reichmanis, E[Reichmanis, Elsa]
DGIST Authors
Hong, JI[Hong, Jung-Il]
Issue Date
2013-04-10
Citation
ACS Applied Materials and Interfaces, 5(7), 2368-2377
Type
Article
Article Type
Article
Keywords
Carrier MobilityCharge TransferCharge TransportFlexible ElectronicsIrradiationMorphologyNano-FibrilsOFETsPoly (3-Hexylthiophene)Poly(3-Hexylthiophene)Polymer SemiconductorPolymer SemiconductorsUltra-SonicationUltrasonics
ISSN
1944-8244
Abstract
Facile methods for controlling the microstructure of polymeric semiconductors are critical to the success of large area flexible electronics. Here we explore ultrasonic irradiation of solutions of poly(3-hexylthiophene) (P3HT) as a simple route to creating ordered molecular aggregates that result in a one to two order of magnitude improvement in field effect mobility. A detailed investigation of the ultrasound induced phenomenon, including the role of solvent, polymer regioregularity (RR) and film deposition method, is conducted. Absorption spectroscopy reveals that the development of low energy vibronic features is dependent on both the regioregularity as well as the solvent, with the latter especially influential on the intensity and shape of the band. Use of either higher regioregular polymer or ultrasonic irradiation of lower regioregular polymer solutions results in high field effect mobilities that are nearly independent of the dynamics of the film formation process. Surprisingly, no distinct correlation between thin-film morphology and macroscopic charge transport could be ascertained. The relationships between molecular and process parameters are very subtle: modulation of one effects changes in the others, which in turn impact charge transport on the macroscale. Our results provide insight into the degree of control that is required for the development of reproducible, robust materials and processes for advanced flexible electronics based on polymeric materials. © 2013 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2436
DOI
10.1021/am3027822
Publisher
Association for Computing Machinery
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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