Lithium perchlorate-doped poly(styrene-b-ethylene oxide-b-styrene) lamellae-forming triblock copolymer as high capacitance, smooth, thin film dielectric

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Abstract

A symmetric poly(styrene-b-ethylene oxide-b-styrene) (SOS) triblock copolymer with block molecular weights (Mn) of 7k-14k-7k was synthesized by anionic polymerization. Various amounts of lithium perchlorate salt ([O/Li] ) 3, 6, 12, 24, and 48) were incorporated into the SOS block copolymer to achieve an elevated charge carrier density, which also led to lamellae formation and reduced crystallinity of the poly(ethylene oxide) block according to small-angle X-ray scattering and differential scanning calorimetry. Spin-coated SOS/LiClO4 capacitors of 30 nm thickness exhibit very high capacitances (up to 4.5 μF/cm2 at 10 Hz and 1.5 μF/cm 2 at 1000 Hz with an amplitude of 0.1 V) and rather smooth surfaces (root-mean-square roughness of 0.5-2 nm). We expect to optimize these thin-film capacitors for high-performance organic thin film transistor applications.

Original languageEnglish (US)
Pages (from-to)3903-3908
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number10
DOIs
StatePublished - Mar 12 2009

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