John R Reynolds | Georgia Institute of Technology | “Addressing the Processing Gap in Organic Electronic Materials”
Event Date:
August 28, 2014 – 3:30 PM to August 29, 2014 – 4:59 PM
Location:
Burson 115
Event Date:
August 28, 2014 – 3:30 PM to August 29, 2014 – 4:59 PM
Location:
Burson 115
Ph.D Nanoscale Science
Seminar Series
Fall 2014
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John R Reynolds
Georgia Institute of Technology
School of Chemistry and Biochemistry, School of Materials Science and Engineering,
Center for Organic Photonics and Electronics, Georgia Tech Polymer Network
“Addressing the Processing Gap in Organic Electronic Materials”
Abstract:
We will address the synthesis and optimization of the morphology of solution processed π-conjugated oligomers and polymers, as they are applied in organic electronic devices. We seek to address the processing gap that is holding back developments in organic electronics, wherein laboratory experiments are most often carried out using spin-coating or drop-casting, yielding materials whose interfacial properties and morphologies are distinctly different from what is obtained using more practical roll-to-roll methods. We will discuss the control of morphology via a combination of structure and processing method (focusing on spray, blade and slot-die coating), and use organic photovoltaic (OPV) and electrochromic polymer (ECP) platforms for materials characterization. The flexible synthetic chemistry of dioxythiophene-based polymers has allowed us to complete the color palette of vibrantly colored to transmissive switching electrochromes of any color, including black. Using thiophene-based donors and linkers, we use a Donor-Acceptor (D-A) arrangement with isoindigo, thienoisoindigo, and diketopyrrolopyrrole (DPP) acceptors to prepare light harvesting molecules and polymers which serve as electron donor materials in bulk heterojunction OPV. We have demonstrated how the mixing of symmetric and asymmetric molecules provide compositions that form films with small crystalline features, elevated charge mobility, and enhanced PV properties.
Bio:
Dr. John R. Reynolds is a Professor of Chemistry and Biochemistry, and Materials Science and Engineering at the Georgia Institute of Technology with expertise in polymer chemistry He serves as a member of the Center for Organic Photonics and Electronics (COPE) and Director of the Georgia Tech Polymer Network (GTPN). His research interests have involved electrically conducting and electroactive conjugated polymers for over 35 years with work focused to the development of new polymers by manipulating their fundamental organic structure in order to control their optoelectronic and redox properties. His group has been heavily involved in developing new polyheterocycles for visible and infrared light electrochromism, along with light emission from polymer and composite LEDs (both visible and near-infrared) and light emitting electrochemical cells (LECs). Further work is directed to using organic polymers and oligomers in photovoltaic cells. Reynolds obtained his M.S. (1982) and Ph.D. (1984) degrees from the University of Massachusetts in Polymer Science and Engineering, he has published over 325 peer-reviewed scientific papers, has 25 patents issued and ~15 patents pending, and served as co-editor of the “Handbook of Conducting Polymers” which was published in 2007. He serves on the editorial board for the journals ACS Applied Materials and Interfaces, Macromolecular Rapid Communications, Polymers for Advanced Technologies, and the Journal of Macromolecular Science, Chemistry. John has been married since October of 1986, has three children, and he and his wife make their home in Dunwoody GA. He can be reached by e-mail at reynolds@chemistry.gatech.edu or see http://ww2.chemistry.gatech.edu/reynolds/.
Thursday, August 28, 2014 @ 3:30 PM in Burson 115
Coffee & soft drinks served at 3:15 PM ~~ Reception at 4:30 PM in Burson 120