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Relevant academic research and scientific papers

Organic semiconductors with helical structure based on oligothiophene derivatives exhibiting chiral nematic phase

We have synthesized 2-[5-(4-[(S)-2-methylbutoxy]phenyl)-3-methyl]-2'''- propyl-2:5'-2':5''-2'':5'''-quaterthiophene (10), a liquid crystalline semiconductor that exhibits a chiral nematic phase, and used the time-of-flight technique to determine its carrier mobility behavior. In the chiral nematic phase, the positive carrier mobility was 210-4cm2/Vs at 120C and the negative carrier mobility was 110-4cm2/Vs, both of which we attribute to electronic processes. For the negative carrier, in addition to the fast electronic process, we also observed a slow carrier transport, having mobility on the order of 10-5cm2/Vs, which we attribute to ionic conduction. Chiral dimers containing binaphthyl group exhibited stable glassy cholesteric phase and cholesteric thin films with selective reflection band in visible light area could be fabricated. They emitted circularly polarized light with dichroic parameter of 1.3 when UV light was illuminated.

High carrier mobility up to 0.1 cm2/Vs and a wide mesomorphic temperature range of alkynyl-substituted terthiophene and quaterthiophene derivatives

Smectic semiconductors with high carrier mobility were designed and synthesized. The hole mobility of 3-TTP-yne-4 and 3-QTP-yne-3 at room temperature was 0.06cm2/Vs and 0.1cm2/Vs, respectively. They exhibit highly ordered smectic phases around room temperature, with softness to some extent, which make it possible homogeneous film with low defect density. Intermolecular distance in the smectic phase of 3-QTP-yne-4 is almost same as that of 3-TTP-yne-4. In this material, larger n-conjugate system results in higher carrier mobility.

Mesomorphic behaviors and charge carrier transport in terthiophene derivatives

We synthesized dialkylterthiophene derivatives ω-substituted with cyclohexylethyl moiety, which exhibit smectic mesophases at room temperature, and investigated their charge carrier transport properties. In particular, transpentylcyclohexylethyl-propylterthiophene (3-TTP-C2CH-5) held SmB phase at room temperature. Furthermore, a 3:1 mixture of 3-TTP-C2CH-5 and (2-methylbutyl)-dodecylterthiophene (5*-TTP-12) showed the SmB phase between 101°C and -15°C, and the highly ordered smectic phase below -15°C. In the SmB phase of the mixture, hole and electron mobility was 10-3 cm2/Vs, and independent of temperature and electric field over room temperature. However, below room temperature, the mobility depended on both temperature and electric field, as is often observed in organic amorphous solids and formarized by Gaussian disorder model, suggesting that the carrier transport in the smectic mesophase can be explained by the hopping conduction in disordered molecular sites.