Ultra-low p-doping of poly(3-hexylthiophene) and its impact on polymer aggregation and photovoltaic performance
AuthorsSaid, Marcel M.
Dasari, Raghunath R.
Anjum, Dalaver H.
Marder, Seth R.
KAUST DepartmentImaging and Characterization Core Lab
Physical Sciences and Engineering (PSE) Division
KAUST Solar Center (KSC)
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AbstractPoly(3-hexylthiophene) (P3HT) films and P3HT / fullerene photovoltaic cells have been p-doped with very low levels (< 1 wt. %) of molybdenum tris[1-(trifluoromethylcarbonyl)- 2-(trifluoromethyl)-ethane-1,2-dithiolene]. The dopants are inhomogenously distributed within doped P3HT films, both laterally and as a function of depth, and appear to aggregate in some instances. Doping also results in subtle changes in the local and long range order of the P3HT film. These effects likely contribute to the complexity of the observed evolutions in conductivity, mobility and work function with doping levels. They also negatively affect the open-circuit voltage and fill factor of solar cells in unexpected ways, indicating that dopant aggregation and non-uniform distribution can harm device performance.
CitationUltra-low p-doping of poly(3-hexylthiophene) and its impact on polymer aggregation and photovoltaic performance 2016, 4 (1):1 Organic Photonics and Photovoltaics
SponsorsThis work was supported by the Office of Naval Research (N00014- 14-1-0126) and the Air Force Office of Scientific Research (BIONIC Program, FA9550-09-1-0162). The author would like to thank Guy Olivier Ngongang and Kui Zhao for their generous assistance and input regarding photovoltaic and transistor measurements, and absorbance data modelling.
PublisherWalter de Gruyter GmbH