Electrolyte-gated transistors based on phenyl-C61 -butyric acid methyl ester (PCBM) films: bridging redox properties, charge carrier transport and device performance

Chemical Communications : Chem Comm
Tian LanClara Santato

Abstract

The n-type organic semiconductor phenyl-C61-butyric acid methyl ester (PCBM), a soluble fullerene derivative well investigated for organic solar cells and transistors, can undergo several successive reversible, diffusion-controlled, one-electron reduction processes. We exploited such processes to shed light on the correlation between electron transfer properties, ionic and electronic transport as well as device performance in ionic liquid (IL)-gated transistors. Two ILs were considered, based on bis(trifluoromethylsulfonyl)imide [TFSI] as the anion and 1-ethyl-3-methylimidazolium [EMIM] or 1-butyl-1-methylpyrrolidinium [PYR14] as the cation. The aromatic structure of [EMIM] and its lower steric hindrance with respect to [PYR14] favor a 3D (bulk) electrochemical doping. As opposed to this, for [PYR14] the doping seems to be 2D (surface-confined). If the n-doping of the PCBM is pursued beyond the first electrochemical process, the transistor current vs. gate-source voltage plots in [PYR14][TFSI] feature a maximum that points to the presence of finite windows of high conductivity in IL-gated PCBM transistors.

References

Dec 15, 2010·ACS Nano·Fabio CicoiraRichard Martel
Aug 18, 2012·The Journal of Physical Chemistry. B·Kazuhide UenoMasayoshi Watanabe
Dec 4, 2012·Advanced Materials·Se Hyun KimC Daniel Frisbie
Dec 16, 2016·Nature·Takao SomeyaGeorge G Malliaras

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