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Enhancing Polymer Thin Film Transistors: Nucleation Strategies for High Mobility Crystals

Learn how nucleation of crystals off the gate dielectric boosts charge mobility in polymer thin film transistors. Explore proven strategies such as smoothing the dielectric, coating with OTS, and using high molecular weight polymers. Discover the significance of aligned conjugated backbones for efficient charge hopping between grains.

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Enhancing Polymer Thin Film Transistors: Nucleation Strategies for High Mobility Crystals

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  1. s s s s s s s s s s The key to making high mobility polymer thin film transistors: nucleation of crystals off of the gate dielectricStanford MRSEC, DMR-0213618 • When conjugated polymer crystals nucleate off of the gate dielectric, the conjugated backbones, shown in red, are all aligned. Charge can easily hop from one grain to another. • Proven strategies for nucleating crystals on the dielectric • Make the dielectric smooth • Coat the dielectric with OTS • Use high boiling point solvent or anneal the film • Use high molecular weight polymers. Kline, R. J., McGehee, M. D., Fréchet, J. M. J., et al. Macromolecules 38, 3312 (2005) Kline, R. J., McGehee, M. D. & Toney, M. F., Nature Materials 5, 222 (2006).

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