Thermal crosslinking of organic semiconducting polythiophene improves transverse hole conductivity

Gearba, Ioana R.; Nam, Chang-Yong; Pindak, Ron; Black, C. T.
October 2009
Applied Physics Letters;10/26/2009, Vol. 95 Issue 17, p173307
Academic Journal
Thermal crosslinking using a suitable radical initiator simultaneously improves electrical conductivity in the semiconducting polymer poly(3-hexylthiophene) and makes the material insoluble. Crosslinked polythiophene shows as much as a fivefold increase in hole conductivity across the film thickness without any shift in spectral light absorption. Grazing incidence x-ray diffraction reveals more in-plane polymer lamellae stacking with only a small decrease in film crystallinity. Improved transverse conductivity increases the performance of model planar solar cells by threefold, from 0.07% to 0.2%. The ability to render polythiophene insoluble without disrupting film structural order enables fabrication pathways to more complex device architectures.


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