Physics – Condensed Matter – Materials Science
Scientific paper
2009-11-23
Physics
Condensed Matter
Materials Science
accepted for publication in Solar Energy Materials and Solar Cells
Scientific paper
10.1016/j.solmat.2009.11.020
The time dependence of device performance has been measured for photocells using blends containing the conjugated polymer, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) 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. Performance was characterized by the short-circuit current output of the devices, with the time dependence of PCBM samples typically degrading exponentially. Variations in the characteristic lifetime of the devices were observed to depend on the molar fraction of the electron acceptor molecules (calculated with respect to the MEH-PPV monomer fraction). In comparison to the PCBM samples, the stability of the PCBOD blends was significantly enhanced, with a one or two order of magnitude improvement. Corresponding spectroscopic data with similar time evolution as the transport measurements suggests an independent means for determining and understanding degradation mechanisms.
Jr.
Adalsteinsson Thorsteinn
Allagoa Enaanake
Barber Richard P.
Johnson Brian H.
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