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On‐Top π‐Stacking of Quasiplanar Molecules in Hole‐Transporting Materials: Inducing Anisotropic Carrier Mobility in Amorphous Films |
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| Authors: | Prof Dr Atsushi Wakamiya Hidetaka Nishimura Dr Tatsuya Fukushima Furitsu Suzuki Dr Akinori Saeki Prof Dr Shu Seki Dr Itaru Osaka Prof Dr Takahiro Sasamori Dr Michihisa Murata Prof Dr Yasujiro Murata Prof Dr Hironori Kaji |
| Institution: | 1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611‐0011 (Japan);2. Precursory Research for Embryonic Science and Technology (PRESTO) (Japan) Science and Technology Agency, 4‐1‐8 Honcho, Kawaguchi, Saitama 332‐0012 (Japan);3. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2‐1 Yamadaoka, Suita, Osaka 565‐0871 (Japan);4. Emergent Molecular Function Research Group, RIKEN CEMS, Wako, Saitama 351‐0198 (Japan) |
| 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. |
| Keywords: | amorphous materials heterocycles semiconductors structure– function relationships structure elucidation |