On-top π-stacking of quasiplanar molecules in hole-transporting materials: inducing anisotropic carrier mobility in amorphous films.
Dimers of partially oxygen-bridged triarylamines were designed and synthesized as hole-transporting materials. X-ray structural analyses revealed that these compounds form on-top π-stacking aggregates in the crystalline state. TRMC measurements showed that high levels of anisotropic charge transport were induced in the direction of the π-stacking. Surprisingly, even in vacuum-deposited amorphous films, these compounds retained some of the face-on π-stacking, thus facilitating an out-of-plane carrier mobility.
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan); Precursory Research for Embryonic Science and Technology (PRESTO) (Japan) Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan). wakamiya@scl.kyoto-u.ac.jp.
Atsushi
A
Wakamiya
Hidetaka
H
Nishimura
Tatsuya
T
Fukushima
Furitsu
F
Suzuki
Akinori
A
Saeki
Shu
S
Seki
Itaru
I
Osaka
Takahiro
T
Sasamori
Michihisa
M
Murata
Yasujiro
Y
Murata
Hironori
H
Kaji
amorphous materials; heterocycles; semiconductors; structure elucidation; structure-function relationships