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Microscopic Signature of Metallic State in Semicrystalline Conjugated Polymers Doped with Fluoroalkylsilane Molecules
Author(s) -
Tanaka Hisaaki,
Hirate Masataka,
Watanabe Shun,
Kuroda Shinichi
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201304691
Subject(s) - materials science , conjugated system , polymer , doping , crystallinity , metal , molecule , signature (topology) , nanotechnology , chemical engineering , chemical physics , polymer science , organic chemistry , optoelectronics , composite material , metallurgy , chemistry , geometry , mathematics , engineering , physics
Fluoroalkylsilane (FTS) acts as an efficient p‐type dopant for organic semiconductors. FTS‐doped films of the semicrystalline PBTTT polymer exhibit relatively high conductivities. We demonstrate that highly doped PBTTT films exhibit a metallic nature with clear Pauli paramagnetism as observed microscopically using electron spin resonance spectroscopy. The metallic state is realized within crystalline grains, as confirmed from the anisotropy of the ESR signal.