Conjugated block copolymer, P3HT-b-PFMA, undergoes a self-layering effect that provides significant improvement in the electrical charge carrier properties of the semiconductor component without a OTS or other SAM treatment layer.  Transmission Electron Microscopy with complementary Energy Dispersive X-ray mapping directly and clearly reveals, the self-organization of the fluorinated block copolymer, with fluorine migrating to the upper surface layer of the block copolymer thin film, driving a P3HT organization at the bare SiO2 surface. Furthermore, this block copolymer can be used as an minor additive (as little as 2.5%) to P3HT, resulting in a closely packed lamellae configuration which increased the mobility from 0.5 cm2 V-1 s-1 for P3HT to 1.7 cm2 V-1 s-1.  We find that this concept allows the design of a semiconductor material that promotes efficient charge transfer processes, influences the nanoscale architecture of thin film device while simultaneously introducing a self-protective layer; and as such can provide a notable and versatile approach to the design of organic semiconductor systems in optoelectronic devices.

No need for SAMS in OFETS? Self-layered nanomorphology for enhanced mobility of fluoroalkyl/P3HT block copolymers

247th National Meeting (2014)

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