Physics – Condensed Matter – Materials Science
Scientific paper
2011-08-31
Physics
Condensed Matter
Materials Science
manuscript submitted to Solar Energy Materials and Solar Cells
Scientific paper
Time-dependent measurements of both power conversion efficiency and ultraviolet-visible absorption spectroscopy have been observed for solar cell blends containing the polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) with two different functionalized C60 electron acceptor molecules: commercially available [6,6]-phenyl C61 butyric acid methyl ester (PCBM) or [6,6]-phenyl C61 butyric acid octadecyl ester (PCBOD) produced in this laboratory. Efficiency was found to decay with an exponential time dependence, while spectroscopic features show saturating exponential behavior. Time constants extracted from both types of measurements showed reasonable agreement for samples produced from the same blend. In comparison to the PCBM samples, the stability of the PCBOD blends was significantly enhanced, while both absorption and power conversion efficiency were decreased.
Adalsteinsson Thorsteinn
Barber Richard P. Jr.
Giammona Maxwell J.
McNelis Brian J.
Nathan Shreya
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