Critical Role of Side-Chain Attachment Density on the Order and Device Performance of Polythiophenes

By R. J. Kline, Dean M. DeLongchamp, D. Fischer, E. Lin, L. Richter, Michael L. Chabinyc, M. Toney, M. Heeney, Iain McCulloch. 2007

311 citations recorded by the source corpus.

High performance, solution processable semiconductors are critical to the realization of low cost, large area electronics. We show that a signature molecular packing motifside-chain interdigitationcorrelates to high performance for a large and important class of organic semiconductors. The side chains of recently developed high performance copolymers of poly(alkylthiophenes) can and do interdigitate substantially, whereas they do not in the most common form of the extensively studied, lower performance poly(alkythiophenes). Side-chain interdigitation provides a mechanism for three-dimensional ordering; without it, poly(alkylthiophenes) are limited to small domains and poor performance. We propose the synthetic design rule that three-dimensional ordering is promoted by side-chain attachment densities sufficiently low to permit interdigitation.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/2525cf662a7412adefbdbe7c9ee9aea2ce4e645c

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In Electrical and Electronic Engineering

In Polymers and Plastics

Citations in the corpus

Small Bandgap Polymers for Organic Solar Cells (Polymer Material Development in the Last 5 Years) (2008, background): “54 55 This enhances the transport properties such as the hole mobility, thereby reducing the limitation of a space charge limited photocurrent.”