High Carrier Mobility of Organic Field‐Effect Transistors with a Thiophene–Naphthalene Mesomorphic Semiconductor

Oikawa, K; Monobe, Hirosato; Nakayama, Keiichi I.; Kimoto, Takahisa; Tsuchiya, Kensuke; Heinrich, Benoît; Guillon, Daniel; Shimizu, Yo; Yokoyama, Masaaki

doi:10.1002/adma.200602608

Cited by 102 publications

(51 citation statements)

References 24 publications

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“…Even the simplest calamitics, alkylalkoxylbiphenyls, had values of 10 À3 cm 2 Á V À1 Á s À1 in their SmB phases, confirming the effective charge migration due to pronounced organization. [87] On the other hand, due to their low order, nematic [90] Evaluating the results compiled in Table 2, it is evident that the charge carrier mobility increases as expected along with the quality of molecular packing within the smectic layers. Phases with a liquid-like packing (smectic A and C) possess charge carrier mobilities of only 10 À4 cm 2 Á V À1 Á s…”

Section: Organic Semiconducting Materials With Rodlike Structurementioning

confidence: 71%

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

Pisula¹,

Zorn²,

Chang³

et al. 2009

Macromol. Rapid Commun.

371

276

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Organic semiconducting materials offer the advantage of solution processability into flexible films. In most cases, their drawback is based on their low charge carrier mobility, which is directly related to the packing of the molecules both on local (amorphous versus crystalline) and on macroscopic (grain boundaries) length scales. Liquid crystalline ordering offers the possibility of circumventing this problem. An advanced concept comprises: i) the application of materials with different liquid crystalline phases, ii) the orientation of a low viscosity high temperature phase, and, iii) the transfer of the macroscopic orientation during cooling to a highly ordered (at best, crystalline-like) phase at room temperature. At the same time, the desired orientation for the application (OLED or field-effect transistor) can be obtained. This review presents the use of molecules with discotic, calamitic and sanidic phases and discusses the sensitivity of the phases with regard to defects depending on the dimensionality of the ordered structure (columns: 1D, smectic layers and sanidic phases: 2D). It presents ways to systematically improve charge carrier mobility by proper variation of the electronic and steric (packing) structure of the constituting molecules and to reach charge carrier mobilities that are close to and comparable to amorphous silicon, with values of 0.1 to 0.7 cm(2) · V(-1) · s(-1) . In this context, the significance of cross-linking to stabilize the orientation and liquid crystalline behavior of inorganic/organic hybrids is also discussed.

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Section: Organic Semiconducting Materials With Rodlike Structurementioning

confidence: 71%

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

Pisula¹,

Zorn²,

Chang³

et al. 2009

Macromol. Rapid Commun.

371

276

View full text Add to dashboard Cite

show abstract

“…Interestingly, a thiophene-naphthalenebased mesogen, compound 9 , retains its layered structure in a polycrystalline phase at room temperature in a thermally deposited OFET, giving a high carrier mobility of 0.14 cm 2 V − 1 s − 1 . [ 34 ] However, its mobility decreases following annealing in the smectic phase at 100 ° C, possibly because of cracking of the organic layer caused by differential degrees of expansion of the layer and the substrate. Mesogens with room temperature smectic phases have also been synthesized, some with a timeof-fl ight carrier mobility of 0.1 cm 2 V − 1 s − 1 , see compound 10 , and 0.2 cm 2 V − 1 s − 1 for compound 11 , for holes and electrons respectively.…”

Section: Smectic Liquid Crystals In Ofetsmentioning

confidence: 99%

Ordered Materials for Organic Electronics and Photonics

2010

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We present a critical review of semiconducting/light emitting, liquid crystalline materials and their use in electronic and photonic devices such as transistors, photovoltaics, OLEDs and lasers. We report that annealing from the mesophase improves the order and packing of organic semiconductors to produce state-of-the-art transistors. We discuss theoretical models which predict how charge transport and light emission is affected by the liquid crystalline phase. Organic photovoltaics and OLEDs require optimization of both charge transport and optical properties and we identify the various trade-offs involved for ordered materials. We report the crosslinking of reactive mesogens to give pixellated full-colour OLEDs and distributed bi-layer photovoltaics. We show how the molecular organization inherent to the mesophase can control the polarization of light-emitting devices and the gain in organic, thin-film lasers and can also provide distributed feedback in chiral nematic mirrorless lasers. We update progress on the surface alignment of liquid crystalline semiconductors to obtain monodomain devices without defects or devices with spatially varying properties. Finally the significance of all of these developments is assessed.

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“…These properties make the naphthalene derivatives very useful precursors for preparation of: fluorophores of luminescent materials [8,9], polymer light-emitting diodes [10,11] and organic semiconductors [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of thermal behavior of photoluminescent copolymers studied by the TG/DTG/FTIR coupled method

Podkościelna

Sobiesiak

2016

J Therm Anal Calorim

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Thermal properties of the photoluminescent copolymers, naphthalene-2,7-diol dimethacrylate derivatives, are presented in this paper. The materials were synthesized by bulk copolymerization of 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene (2,7-NAF.DM) with four popular vinyl monomers: 2-hydroxyethyl methacrylate (HEMA), butyl acrylate (BA), divinylbenzene (DVB) and styrene (ST). As an initiator, the a,a 0 -azoiso-bis-butyronitrile was used. Thermal stabilities and degradation behaviors of the obtained copolymers were studied by means of the differential scanning calorimetry and thermogravimetric (TG/DTG, in air and in helium atmosphere) analyses. Gases evolved during the thermal treatment were monitored using the TG-FTIR coupled method. The presented copolymers can have potential application as luminophores, protective coatings or fiber-optical sensors.

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High Carrier Mobility of Organic Field‐Effect Transistors with a Thiophene–Naphthalene Mesomorphic Semiconductor

Cited by 102 publications

References 24 publications

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

Ordered Materials for Organic Electronics and Photonics

Characteristics of thermal behavior of photoluminescent copolymers studied by the TG/DTG/FTIR coupled method

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