Controlled orientation of liquid-crystalline polythiophene semiconductors for high-performance organic thin-film transistors

Wu, Yiliang; Liu, Ping; Ong, Beng S.; Srikumar, Tharan; Zhao, Ni; Botton, Gianluigi A.; Zhu, Shiping

doi:10.1063/1.1894597

Cited by 148 publications

(160 citation statements)

References 16 publications

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“…In these molecules the delocalized electrons, coupled to the packing of the molecules that often pair these orbitals, permit achieving rather large electron mobility. Typically it depends also on the crystalline orientation and may vary by order of magnitude [160][161][162]. Among the most studied small molecular systems we cite oligothiophenes, rubrene, tris(quinolinolate) Al (Alq3), and poly(p-phenylene vinylene) (PPV).…”

Section: Organic Based Optoelectronicsmentioning

confidence: 99%

Hybrid Materials for Integrated Photonics

Bettotti

2014

Advances in Optics

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In this review materials and technologies of the hybrid approach to integrated photonics (IP) are addressed. IP is nowadays a mature technology and is the most promising candidate to overcome the main limitations that electronics is facing due to the extreme level of integration it has achieved. IP will be based on silicon photonics in order to exploit the CMOS compatibility and the large infrastructures already available for the fabrication of devices. But silicon has severe limits especially concerning the development of active photonics: its low efficiency in photons emission and the limited capability to be used as modulator require finding suitable materials able to fulfill these fundamental tasks. Furthermore there is the need to define standardized processes to render these materials compatible with the CMOS process and to fully exploit their capabilities. This review describes the most promising materials and technological approaches that are either currently implemented or may be used in the coming future to develop next generations of hybrid IP devices.

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Section: Organic Based Optoelectronicsmentioning

confidence: 99%

Hybrid Materials for Integrated Photonics

Bettotti

2014

Advances in Optics

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“…Control of a molecular conformation and an orientation on the surface is highly required to attain high charge carrier mobility of a plastic circuit. 1 A self-assembled monolayer (SAM) of alkanethiol is known as a highly ordered monolayer, and a patterned SAM has been fabricated for bioelectronics with a microcontact printing method. 2 Another method to control the molecular conformation and the orientation is thought to be the application of an external force.…”

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confidence: 99%

Effects of a Magnetic Force on Surface-Enhanced Raman Spectra of a Cysteamine Linking Magnetic Particle and a Silver Colloid Plate

2007

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The controlled adsorption of alkanethiol on a metal surface is crucial for the fabrication of molecular sensors and organic electronics. Control of a molecular conformation and an orientation on the surface is highly required to attain high charge carrier mobility of a plastic circuit. 1 A self-assembled monolayer (SAM) of alkanethiol is known as a highly ordered monolayer, and a patterned SAM has been fabricated for bioelectronics with a microcontact printing method. 2 Another method to control the molecular conformation and the orientation is thought to be the application of an external force.Any particles are magnetized under magnetic field gradients, and a magnetic force works on the particles. A magnetic force was applied to migration analysis of micro-particles in solution and in air, [3][4][5][6][7][8][9][10] utilizing the proportionality between the magnetic force and the particle's magnetic susceptibility. Although a magnetic force is expected to be used as a non-contact and controllable force on a single micro-particle or molecular monolayer, serious difficulties exist in applications to diamagnetic organic molecules, because of the small magnetic susceptibility. Then, the use of magnetic particles (MPs) possessing a high magnetic susceptibility is promising for the application of magnetic forces on an organic molecule and a monolayer. The present study demonstrates the effects of magnetic forces on the conformation of cysteamine linking a MP and a silver colloid, by means of surface-enhanced Raman scattering (SERS) spectroscopy.Silver nitrate (99.9999%, Aldrich), tri-sodium citrate dehydrate (Nacalai Tesque, Inc., Japan), (3-aminopropyl)-trimethoxysilane (APTMS, 97%, Aldrich), glutaraldehyde (25%, Wako Pure Chemical Industries, Ltd., Japan), and cysteamine hydrochloride (98%, Sigma) were used as received. Super-paramagnetic amine-terminated particles (mean diameter = 1 μm, BioMag Plus Amine, Polysciences, Inc., USA) were washed 10 times with distilled water. All solutions were prepared with distilled and deionized water by a Milli-Q system (resistivity ≈18.2 MΩ cm -1 ). A citrate-reduced silver colloid solution was prepared according to a Lee and Meisel method. 11 A silver nitrate solution (1.1 mM, 200 ml) mixed with a sodium citrate solution (1% (w/w), 4 ml) was refluxed for 90 min. A glass plate (26 × 30 mm 2 ) was chemically modified with APTMS. A silver colloid solution (300 μl) was deposited on an APTMS activated plate for 1 night, and then washed with distilled water.The washed amine-terminated magnetic particles (MPs) were activated with 5% glutaraldehyde solution by shaking for 2 h. The activated MP solution was then added to a 17.6 mM cysteamine solution and shaken for 1 h. The MP solution was washed 20 times with distilled water to remove any unreacted cysteamine (final residue ≈6 pM), and deposited onto a silver colloid plate for 2 h. The sample plate was washed with distilled water just before measurements.Magnetic field gradients generated by two permanent magnets induced a magnetic force...

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“…This µ is about ten times that for ink-jet printed SWNTs/PQT-12 TFTs 27,28 at an ON/OFF ratio∼10 5 . When compared to pure organic semiconducting polymers, our µ is 20 times higher than ink-jet printed PQT-12, 132,133 and twice the highest reported µ for ink-jet printed TFT made of pure (Poly(2,5-bis(3-tetradecyllthiophen-2-yl)thieno[3,2-b]thiophene). 18,140,142,143 Thus, the combination of grapheneand organic semiconducting-inks is promising for high performance printed electronics.…”

Section: Ink-jet Printed Featuresmentioning

confidence: 82%

“…11,18 So far SWNT ink-jet printed devices measured at room conditions have µ no larger than ∼1cm 2 V −1 s −1 (at ON/OFF ratio∼10), 29 which is two orders of magnitude smaller than our graphene ink-jet printed TFTs. Organic semiconducting inks [131][132][133] suffer from low µ, limited by variable range hopping of charges between the isolated polymer chains. 137 The overall charge conduction in crystalline organic semiconducting thin films is determined by both intra-chain and inter-chain charge transport.…”

Section: Ink-jet Printed Featuresmentioning

confidence: 99%

“…140 Embedding SWNTs in the semiconducting ink allowed us to get µ ∼ 0.07cm 2 V −1 s −1 at room conditions. 27,28 Page 23 of 40 22 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 We combine our graphene-ink with one of the most common organic polymer in ink-jet printing, Poly[5,5'-bis(3-dodecyl-2-thienyl)-2,2'-bithiophene] (PQT-12) [131][132][133] in order to investigate its viability as interchain hopping enhancer. PQT-12 is widely used due to the higher environmental stability (up to 300 days at room conditions 141 ), with respect to other organic semiconducting inks.…”

Section: Ink-jet Printed Featuresmentioning

confidence: 99%

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