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Reichmanis, Elsa

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    Structure – Process - Property Relationships Governing Solution Processed Semiconductor Performance
    (Georgia Institute of Technology, 2016-01-26) Reichmanis, Elsa
    Polymeric semiconductors are promising materials for the commercialization of large‐area, low‐cost and flexible electronics. Their electrical properties are extremely sensitive to structure at multiple length scales, and process modifications can impact calculated hole mobilities by up to four orders of magnitude. For the readily available semiconducting polymer, poly(3‐hexylthiophene) (P3HT), various microstructural features that correlate well with hole mobility have been identified. These include paracrystalline disorder, exciton bandwidth, polymer molecular weight, orientation of crystalline domains, and inter‐grain connectivity. Here, a set of general, robust analysis algorithms will be presented that can be used to statistically quantify two‐dimensional order in microstructures of P3HT‐based OFET devices. Application of these analytical techniques to a variety of shear‐based processing methods indicate that shear‐driven alignment of P3HT fibers can effect substantial improvements in macroscale mobility.
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    Polymeric Semiconductors: Molecular Ordering, Charge Transport and Macroscale Mobility
    (Georgia Institute of Technology, 2014-01-28) Reichmanis, Elsa
    The performance of devices fabricated using polymeric semiconductors depends critically upon alignment of the polymer chains at the nano- through macro-scales. Significant structure-process- property relationships that allow for enhancement of long-range order will be described. For instance, a lyotropic liquid crystalline (LC) phase has been observed in poly-(3-hexylthiophene) (P3HT) via solvent-evaporation induced self-assembly. In-situ polarized Raman spectroscopy facilitated investigation of the evolution of structure that eventually was found to undergo a phase transition from an isotropic solution to LC phase. The insights gained through these investigations were applied to the design of an alternative, donor-acceptor (D-A) benzothiadiazole oligothiophene based copolymer material. For one family of copolymers, structural elements were found to provide for a span in hole mobility of approximately 3 orders of magnitude. Samples annealed at moderate temperatures exhibited mobilities in excess of 1 cm²/Vs. The lessons learned through these studies may allow for simple, controllable, and cost-effective methodologies for achieving high-performance plastic electronic devices.