Narrow Gap, High Mobility, and Stable Pi Conjugated Polymers
Final rept. 1 May 2009-30 Apr 2012
FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
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High mobility and ambient stable, processable pi-conjugated and electroactive polymers for optoelectronic and redox charge storage applications were developed. Dithienogermole DTG was developed as a new electron donor and isoindigo iI as a new electron acceptor. By alternating electron donor D and acceptor A moieties, new charge transport and solar polymers have been developed. Using dithienosilole DTS in conjunction with benzothiadiazole BTD as an acceptor, field-effect hole mobilities are enhanced by several orders of magnitude, reaching up to 0.1 cm2V-1s-1. Combining DTG with the thienopyrrolodione TPD acceptor has lead to solar polymers that exhibit AM1.5 power conversion efficiencies PCE in excess of 8 7.4 certified. Using polydimethylsiloxane PDMS as an additive for isoindigo-based molecular OPV, an enhanced PCE in terms of both magnitude and repeatability is observed, which is backed up by reproducible morphologies imaged by AFM and TEM. Isoindigo has been used in a bis-EDOT capped, electropolymerizable D-A-D system to yield highly electroactive films applied in Type 1 Supercapacitors.
- Polymer Chemistry
- Solid State Physics