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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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COPE Seminar Series
Prof. John Reynolds, University of Florida
Spanning the Spectrum with Spray-Processable Donor-Acceptor Polymers for Electrochromics and Photovoltaics
The development of organic electronic and redox active devices that provide a response or interaction over large-areas and on flexible substrates is enabled by access to solution processble conjugated materials. We will present results on a family of fully conjugated polyheterocycles and crosslinkable telechelic oligomers with controlled light absorption for photovoltaic and electrochromic applications. Two band absorption induced by the incorporation of a donor-acceptor-donor (DAD) triad induces long wavelength light collection well into the near infrared for photovoltaic (PV) devices, along with providing processable vibrantly-colored to transmissive electrochromic (EC) polymers. Careful control of this two band absorption can lead to band coalescence and a fully black colored conjugated polymer that can be converted to a transmissive form. Black to clear electrochromism can also be obtained in multi-component devices and materials by planned spectral overlap. Telechelic functionalization of conjugated oligomers allows linear polymerization to chromophore containing polymers, while incorporation of acrylate moities provides UV crosslinkable coatings which have been photopatterned while retaining charge transport and redox activity. We will discuss fundamental optical and electrochemical data in order to establish the electronic structure of the newly synthesized oligomers and polymers, along with presenting results from various device studies (photovoltaic and electrochromic) as platforms for materials property optimization.
