Trion-induced current anomaly in organic polymer
2016 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 34, 124-129 p.Article in journal (Refereed) Published
In this report, an anomalous time-evolution of electrical current in organic thin-film transistors, OTFTs, isrevealed by employing a specially tailored semiconductor composite channel. The composite is designedby controlling the density of carbon nanotubes dispersed in a host semiconducting polymer belowelectrical percolation. The current anomaly, which, to the best of our knowledge, has never beenobserved before, is directly correlated to strong many-body interactions instantaneously occurring in thesystem under investigation. In essence, two on-chain positively charged polarons are fused with anelectrochemically generated negative hydroxyl ion, OH, in the H2O/O2redox reaction to form a trion.The trion, which is characteristic of the polymer, is intrinsically metastable and can dissociate to mobilepolarons under the influence of electricfield, temperature and/or light illumination. The rate of trionformation is almost three orders of magnitude higher than that of trion dissociation. The fast formationand slow dissociation of the trions is the cause responsible for the observed current anomaly. Themetastable trion is, hence, of fundamental importance in the operation of OTFTs. Understanding thefundamentals pertaining to the anomalous phenomenon not only is crucial for design of more efficientdevices but also can guide development of future, emerging applications of OTFTs.
Place, publisher, year, edition, pages
2016. Vol. 34, 124-129 p.
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:uu:diva-294717DOI: 10.1016/j.orgel.2016.04.027ISI: 000376457000020OAI: oai:DiVA.org:uu-294717DiVA: diva2:931283
FunderSwedish Research Council, 2014-5591