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REU Student Project:


Anne Ahlvers
2011 U.S. Students
Advisor: Andre Gesquiere
"Low Bandgap Polymer Doping for P3HT/PCBM Solar Cells"
Recently, conjugated polymer based organic photovoltaic cells (OPVs) have attracted great research attention due to combined processability and outstanding mechanical characteristics of polymers, as well as the ability to readily tailor their electrical and optical properties. Unfortunately, the device performance is strongly limited by the narrow absorption range of most conjugated polymers. Herein, we focus on the near-infrared photoresponse sensitization of P3HT/PCBM solar cells via low band gap polymer PCPDTBT, aiming at harvesting more solar photons in a broad wavelength range. To realize one step active layer preparation, we employed 1,8-diiodooctane (DIO) as a solvent additive to optimize the morphology. Our data indicate that the incorporation of DIO can be used as a substitute to post-annealing (i.e thermal or solvent annealing). For devices made in the presence of DIO, with PCPDTBT doping level of 20 wt%, the device power conversion efficiency can be improve by 18% and 32%, respectively, compared to the reference P3HT/PCBM solar cell with DIO and without DIO.  ...full text

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