A Highly Conductive n-Type Coordination Complex with Thieno[3,2-<i>b</i>]thiophene Units: Facile Synthesis, Orientation, and Thermoelectric Properties
Kazuki Ueda, Riku Fukuzaki, Takumu Ito, Nana Toyama, Masahiro Muraoka, Toshiki Terao, Kei Manabe, Tomoyasu Hirai, Ching-Ju Wu, Shih‐Ching Chuang, Shintaro Kawano, Michihisa Murata
Abstract
An organometallic nickel complex containing thieno[3,2-b]thiophene units was designed and synthesized. Composite films of the resulting nickel complex and polyvinylidene difluoride, which can be fabricated via a simple solution process under atmospheric conditions, exhibit remarkably high n-type conductivity (>200 S cm–1). Moreover, the thermoelectric power factor of the n-type composite film was proven to be air stable. A grazing-incidence wide-angle X-ray diffraction analysis indicated a significant impact of introducing the thieno[3,2-b]thiophene core into the backbone of the nickel complex on the orientation within the composite films.