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Updated: Apr 30, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
On-top π-stacking of quasiplanar molecules in hole-transporting materials: inducing anisotropic carrier mobility in
Atsushi Wakamiya1, Hidetaka Nishimura, Tatsuya Fukushima
1Institute 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.
Abstract:
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.
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Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:

