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Wide bandgap OPV polymers based on pyridinonedithiophene unit with efficiency >5
Alexander M Schneider1, Luyao Lu1, Eric F Manley2,3
1Department of Chemistry and The James Franck Institute , The University of Chicago , 929 E 57th Street , Chicago , IL 60637 , USA .
Abstract:
We report the properties of a new series of wide band gap photovoltaic polymers based on the N-alkyl 2-pyridone dithiophene (PDT) unit. These polymers are effective bulk heterojunction solar cell materials when blended with phenyl-C71-butyric acid methyl ester (PC71BM). They achieve power conversion efficiencies (up to 5.33%) high for polymers having such large bandgaps, ca. 2.0 eV (optical) and 2.5 eV (electrochemical). Grazing incidence wide-angle X-ray scattering (GIWAXS) reveals strong correlations between π-π stacking distance and regularity, polymer backbone planarity, optical absorption maximum energy, and photovoltaic efficiency.
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