Direct spectroscopic evidence for a photodoping mechanism in polythiophene and poly(bithiophene-alt-thienothiophene) organic semiconductor thin films involving oxygen and sorbed moisture
Zhuo, J.-M. Zhao, L.-H. Png, R.-Q. Wong, L.-Y. Chia, P.-J. Tang, J.-C. Sivaramakrishnan, S. Zhou, M. Ou, E.C.-W. Chua, S.-J.
Zhao, L.-H.
Ou, E.C.-W.
Chua, S.-J.
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Abstract
Direct infrared spectroscopic evidence has been obtained for photodoping of high mobility regioregular poly(3-alkylthiophene) and poly[2,5-bis(3- alkyllthiophen-2-yl) thieno (3,2-b)thiophene] with the attendant formation of hydroxide counter-ions. This reveals the central role of dissolved water, explains the key features of degradation of the electrical characteristics of organic semiconductors in the ambient (see figure), and points to possible strategies to further improve their stability. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.
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Source Title
Advanced Materials
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Date
2009-12-11
DOI
10.1002/adma.200901120
Type
Article