Morphology and Charge Transport in Conjugated Polymers

Abstract

Determining the relationship between charge transport and morphology is key to increasing the charge carrier mobility of conjugated polymers. This review details a fundamental study of the charge transport and morphology of regioregular poly(3‐hexylthiophene) and sets out general principles for obtaining high charge carrier mobilities. The basis for this study was the finding that despite being more crystalline, low molecular weight films have a substantially lower mobility than high‐MW films. An examination of this apparent contradiction is used to provide insight into how the charge carriers move through a conjugated polymer film and provide a model for charge transport.

Keywords:

• thin‐film transistor
• polymer morphology
• polythiophene
• charge transport
• grazing incidence x‐ray diffraction
• and conjugated polymer