Interaction of bipolaron with the H2O/O-2 redox couple causes current hysteresis in organic thin-film transistors
2014 (English)In: Nature Communications, ISSN 2041-1723, Vol. 5, 3185- p.Article in journal (Refereed) Published
Hysteresis in the current–voltage characteristics is one of the major obstacles to the implementation of organic thin-film transistors in large-area integrated circuits. The hysteresis has been correlated either extrinsically to various charge-trapping/transfer mechanisms arising from gate dielectrics or surrounding ambience or intrinsically to the polaron–bipolaron reaction in low-mobility conjugated polymer thin-film transistors. However, a comprehensive understanding essential for developing viable solutions to eliminate hysteresis is yet to be established. By embedding carbon nanotubes in the polymer-based conduction channel of various lengths, here we show that the bipolaron formation/recombination combined with the H2O/O2 electrochemical reaction is responsible for the hysteresis in organic thin-film transistors. The bipolaron-induced hysteresis is a thermally activated process with an apparent activation energy of 0.29 eV for the bipolaron dissociation. This finding leads to a hysteresis model that is generally valid for thin-film transistors with both band transport and hopping conduction in semiconducting thin films.
Place, publisher, year, edition, pages
2014. Vol. 5, 3185- p.
Research subject Engineering Science with specialization in Electronics
IdentifiersURN: urn:nbn:se:uu:diva-220191DOI: 10.1038/ncomms4185ISI: 000331118200002OAI: oai:DiVA.org:uu-220191DiVA: diva2:704374