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Reichmanis, Elsa

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    Soft, Responsive and Semiconducting Gels
    (Georgia Institute of Technology, 2018-04-20) Rosu, Cornelia ; Russo, Paul S. ; Reichmanis, Elsa
    Interaction of biopolymers with organic electronic materials provides an appealing opportunity to design electroactive materials for use in many applications especially bioelectronics. Because of their biocompatibility, polypeptides do not act just as simple bio- components; rather they effectively influence the organization of π-conjugated polymers into highly crystalline structures that allow charge transport. The talk will focus on poly(γ-benzyl-L-glutamate), PBLG, a synthetic polypeptide that forms thermoreversible tree-dimensional networks. Blends with poly(3-hexylthiophene), P3HT, resulted in gel materials able to switch reversibly on and off their photo-physical properties. This behavior was observed during two cycles of heating-cooling-aging. Enhanced alignment of P3HT chains into J-aggregate structures, ideal for effective electronic performance, was attributed to interactions between the PBLG benzyl side chains and P3HT hexyl arms.
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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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    BIG IDEAS in Sustainability
    (Georgia Institute of Technology, 2014-03-10) Bras, Bert ; Brown, Marilyn A. ; Crittenden, John C. ; Gardner, John ; Karas, Bruce ; Leffin, Steve ; Reichmanis, Elsa ; Rivenburgh, Diana
    A celebration of three newly appointed Brook Byers Professors and a candid and casual discussion with these industry and academic leaders on: BIG IDEAS in Sustainability.
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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.