DOI: https://doi.org/10.29363/nanoge.aohm.2019.001
Publication date: 8th January 2019
Improving the performance of organic semiconductors further is crucial for next generation organic thin-film transistor (OTFTs) technologies and their application in the rapidly expanding sector of large-area electronics. Beside design and development of advanced new organic semiconductors, molecular doping represents a new powerful approach that promises to address various technical hurdles that are currently preventing OTFT commercialisation. Yet the addition of a molecular dopant into a host organic semiconductor often disrupts its microstructure, introducing defects and therefore harming long-range charge transport. Here I will discuss different doping strategies that can be used to enhance the charge carrier mobility in OTFTs based on a wide range of organic semiconductors including, small-molecules, polymers and small-molecule:polymer blends, with the latter system exhibiting record performance characteristics. Emphasis will be placed on the “all-round” positive effects that the inclusion of a suitable dopant has on key OTFT characteristics including carrier transport, contact resistance, bias-stress stability and device-to-device parameter variation.
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