Alignment-induced epitaxial transition in organic-organic heteroepitaxy.
We report the epitaxial growth of thin films of a small organic molecule (pentacene) on polymer substrates with controllable photoalignment over a wide range. The pentacene molecular plane exhibited a distinct orientational change from parallel to perpendicular relative to the polymer chain with increasing substrate polymer alignment. Each orientation consists of twinlike domains. Such characteristics reveal a unique alignment-induced epitaxial transition controlled by the subtle balance of weak interactions, showing a promising approach for tuning the characteristics of organic semiconductor based electronic devices.
Guo
Dong
D
Organic Nanomaterials Centre, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. dong.guo@epfl.ch
Sakamoto
Kenji
K
Miki
Kazushi
K
Ikeda
Susumu
S
Saiki
Koichiro
K