Highly uniaxial orientation in oligo(p-phenylenevinylene) films induced during wet-coating process.
Highly uniaxial alignment of pi-conjugated oligo(p-phenylenevinylene)s was spontaneously achieved in the as-cast films by simply spin-coating the solution onto mechanically rubbed polymer alignment layers such as poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT:PSS) film, resulting in a high dichroic ratio (A(//)/A(perpendicular)) of 41.0 and an order parameter ([A(//) - A(perpendicular)]/[A(//) + 2A(perpendicular)]) of 0.93 estimated from the polarized absorption spectra of the films, and its application to organic photovoltaic devices was also demonstrated to achieve a high anisotropy in photosensitivity.
Nishizawa
Takeshi
T
Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Lim
Hady Kesuma
HK
Tajima
Keisuke
K
Hashimoto
Kazuhito
K