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0520547_Fultz

Neutron characterization of polymer solar cells Brent T. Fultz, California Institute of Technology, DMR 0520547.

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0520547_Fultz

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  1. Neutron characterization of polymer solar cellsBrent T. Fultz, California Institute of Technology, DMR 0520547 Cheap, light, flexible solar cells can be made from a conducting polymer (P3HT) doped with nanoparticles (PCBM). PCBM extracts photogenerated electrons from the polymer matrix, so cell efficiency depends critically on PCBM distribution. This distribution is difficult to measure with techniques such as XRD or TEM, which cannot effectively distinguish between P3HT and PCBM. Using neutrons and DANSE reflectometry software, researchers have discovered that PCBM gathers preferentially at the interfaces. Modifying fabrication methods may lead to improvements in cell efficiency. Ratio of phenyl-C61-butyric acid methyl ester (PCBM) to poly-3-hexylthiophene (P3HT) in a spin coated OPVC.

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