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However, the C—Br bond of the tail-to-tail thiophene diad at the other terminal can also undergo intramolecular oxidative addition after "long walking" of the Ni0 complex on the backbone. Similar propagation takes place to yield P3HT containing the tail-to-tail thiophene diad inside the backbone bidirectional growth.

In the termination step, the polymer—Ni—Br propagating end is hydrolyzed with hydrochloric acid to form the H-terminal. Therefore P3HTs containing the tail-to-tail thiophene diad at the terminal end and inside the backbone both bear H at one end and Br at the other. The polymerization afforded not only bromophenyl-ended P3HT via unidirectional growth, but also P3HT containing the phenylene unit inside the backbone via directional growth.

They also showed the presence of a single tail-to-tail defect distribution over the whole chain by means of an evaluation of the crystallinity of P3HT obtained with Ni dppp Cl2. Lanni and McNeil conducted kinetic studies and showed that the rate-determining step is transmetallation in the polymerization of 3 with Ni dppp Cl2 and reductive elimination in the polymerization with Ni dppe Cl2. However, McCullough and coworkers reacted dibromothiophene with 0. Bryan and McNeil reacted the bromophenyl Ni complex 4 with an aryl Grignard reagent in the presence of active aryl bromide 5 with an electron-withdrawing CN group Figure 1.

Donor monomers were the first to be developed, including thiophenes, selenophenes, pyrroles, phenylenes, fluorenes, cyclopentadithiophenes, dithienosilole, and non-conjugated bithienylmethylene. Not only acceptor monomers such as pyridines, benzotriazoles, and thiazoles, but also diaryl monomers, have been reported. The thienothiophene monomer was not polymerized with an NiII catalyst because the dimer, formed by the reaction of the NiII catalyst with the monomer in the initiation step, strongly coordinated to the Ni0 generated in this initiation step, blocking oxidative addition of the C-Br bond in the dimer.

Phenylenevinylene monomers did not efficiently undergo Kumada-Tamao coupling, affording only low molecular weight polymers. However, the bromo-magnesium exchange reaction takes longer.

Organic Field-Effect Transistors XI, Conference Details

For example, it took 20 h to generate the Grignard monomer when 2,5-dibromohexylthiophene was treated with t-BuMgCl at room temperature. It is crucial to use an exactly equimolar amount of the Grignard reagent to generate the Grignard monomers. Excess Grignard reagent reacts with the polymer-Ni-Br end-group to afford a polymer with a broad molecular weight distribution and unexpected end-groups.

This catalyst is broadly effective for many monomers: selenophenes, m -phenylenes, cyclopentadithiophenes, dithienosilole, pyridines, thiazoles, and diaryl monomers. While in-plane unidirectional orientation can be achieved through zone casting, dip coating, and variants of graphoepitaxy, these methods preclude the ability to impose preferential orientation along arbitrary patterns. Here, we present a simple method for guiding crystallization with precise in-plane spatial resolution over large areas. By exploiting the differential crystallization rates on substrates having different surface energies, we can preferentially select for the molecular orientations that promote growth along the underlying patterns.

The ability to design free-form crystalline structures within organic thin films through a priori patterning of underlying substrates will enable emerging applications in organic electronics and optics. Large-area solution-grown single-crystals of organic semiconductors for transistors and complementary inverters Invited Paper Paper Author s : Show Abstract. Single-crystals of Organic semiconductors OSCs have superior electronic properties than other aggregate states such as poly-crystals of organic materials. However, single-crystal devices are difficult to fabricate, especially in large-area with high throughput.

Here, we develop a solution processing method to grow large arrays of aligned single crystals of varied OSCs. These crystals exhibit high mobility in transistors and high signal gains in complementary Inverters. Furthermore, our deposition method is scalable to a mm wafer substrate. Hence, our method facilitates the fabrication of large amounts of high-quality OSC single crystals for high performance transistors and complementary circuits. Solution-phase growth of organic single-crystal arrays Paper Author s : Show Abstract.

We have successfully grown organic single-crystal thin films at designated locations from solution. An original micropattern, in which small rectangular regions were connected to a large rectangular region, was developed. We varied local supersaturation of a solution droplet by making a large difference of solvent evaporation between a NCR and a GCR. By using the developed micropattern and controlling the solvent vapor pressure during growth, we achieved to fabricate single-crystal arrays of a stable organic semiconductor, 3,9-bis 4-ethylphenyl -peri-xanthenoxanthene C2Ph-PXX.

Will we ever achieve the growth of large polythiophene single crystals? It is well acknowledged that carrier mobilities of conjugated polymers can be further enhanced by highly crystalline arrangement of alkyl side chains and backbones. However, to date, a detailed description and mechanism of polymer semiconductor crystallization is still not reported in literature due to the scarcity of polymer crystals.

Thiophene oligomers are excellent model structures for the corresponding polydisperse polymers to elucidate the structure-property relationship. We report the synthesis and characterization of monodispersed low-molecular weight polythiophenes and show that such systems clearly demonstrate the importance of conjugation length in controlling crystallinity and morphology.

At the point when conjugation saturation occurs, the electronic properties show convergence behavior to the polymer and a decrease of the degree of crystallinity with increasing molecular weight. Spectroscopy and diffraction show the evolution from small-molecule-style packing to polymer-style packing. These results teach us about parameters that control crystallization in polymer semiconductors.

New pentacene derivative transistors by controlled crystallization from solution Paper Author s : Show Abstract. We present a new candidate acene molecule based on TIPS-pentacene with substitutions in the 1,13,14,22 positions, i.

The substitutions affect the solubility and solidification rate compared to, e. Session 4: Devices I. Large-area, ultraflexible integrated circuits using high-definition, screen-printed organic transistors Invited Paper Paper Author s : Show Abstract. We report high-definition screen-printing for manufacturing large-scale, all-printed organic transistor integrated circuits on plastic films. The printed transistors exhibits a mobility as high as 0. The circuit that employs printed floating-gate organic transistors can compensate for LED brightness variations and degradation for more than 6 months.

The enhancement and depletion-mode OTFTs can be achieved by using different polymer blending with organic semiconductors.

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Solution processed devices are of increasing interest for their applications to low-cost, large-area, flexible electronics using various printing methods such as spin-coating, ink-jet and graveur printings. Among them, the ink-jet printing has more attention due to its selective coating and thus uses small amount of materials to build printed electronics.

High-performance organic thin-film transistors OTFTs have been reported using ink-jet printing. On the other hand, the surface treatment with self-assembled monolayer SAM , and semiconductor and polymer blending are proposed to improve TFT performance. The vertical phase separation between OSC and polymer takes place by introducing OSC and insulating blending, and thus the TFT performance and its stability can be improved, compared to the OTFT with only semiconductor layer, since phase separation enhances the crystallinity of organic semiconductor.

Although the devices with OSC and polymer blending have better performance than that of device without polymer blending, ink-jet printing can be used only for limited materials due to the requirement of viscosity. Note that the viscosity of ink should be between 0. Tuning the threshold voltage Vth from enhancement-mode to depletion-mode is possible by using different functionality of polymer blending. An inverter on plastic shows a gain of Organic gate dielectrics for advancing high-performance organic field-effect transistors and circuits Invited Paper Paper Author s : Show Abstract.

Organic gate dielectrics are the most suitable candidates to be used in OFETs because of their easy processability from solution and their compatibility with plastic substrates. However, the severe problems have become an important drawback that limits the utility of organic integrated circuits. First, high capacitance is required to induce a high density of free carriers at the conducting channel, allowing OFET operation at low voltages. In order to fully realize the all-organic integrated circuitry, it is essential to develop polymer gate dielectrics with easy solution-process to fabricate at low temperature and a good insulation property to reduce leakage current.

Also, the polymer gate dielectric should not be soluble in the solvent used to dissolve organic semiconducting materials, and can be patterned easily to make connections between the gate electrode and the underlying bus lines in the integrated circuitry. Organic complementary analog circuits on plastic foils for sensing applications Canceled Paper Author s : Show Abstract.

We present in this paper an all-organic complementary voltage controlled oscillator which output frequency is controlled by a The differential voltage applied on the circuit's input is transformed into a 1 to Hz variation of the VCO frequency. The presented circuit will be associated with a resistive element made on flexible substrate in order to create an organic sensor.

Structure and Order in Organic Semiconductors

Tuesday 14 August Show All Abstracts. Session 5: Materials and Devices I. Polymer-based stretchable electrodes, dielectrics, and active layers for stretchable devices Invited Paper Paper Author s : Show Abstract. Folding and stretching will be the key characteristics in the next-generation electronic devices, including elastic displays, e-skins, and even in highly flexible devices.

This talk will present recent developments in the fiber-based components for stretchable transistors. Because the long contour path of polymer-based nanofibers can effectively absorb the stress under external extension, the fibers allow large stretchabillity without accumulation of the stress at local positions.

Ion-gels are introduced for the elastic dielectric layer facilitating high-performance device operations. The polymer semiconducting fibers will be discussed as the stretchable active materials.

Research Projects

Low temperature processing routes for metal oxide layers onto flexible or organic functionalised substrates are necessary in a wide range of electronic devices, including the deposition of transparent conducting layers on flexible substrates, preparing optical spacers in tandem solar cells and LEDs and creating electron accepting layers in organic photovoltaics.

We demonstrate pulsed laser deposition PLD as a versatile tool for ZnO film growth, which not only affords control of the physical properties of the films e. We show that deposition can be achieved without the degradation of the soft substrate material and present a correlation of deposition conditions with defect chemistry and electronic structure of the semiconducting layer. Transient analysis of electrolyte-gated organic field-effect transistors Paper Author s : Show Abstract.

A terminal charge and capacitance model is developed for transient behavior simulation of electrolyte-gated organic field effect transistors EGOFETs.

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Based on the Ward-Dutton partition scheme, the charge and capacitance model is derived from our drain current model reported previously. The transient drain current is expressed as the sum of the initial drain current and the charging current, which is written as the product of the partial differential of the terminal charges with respect to the terminal voltages and the differential of the terminal voltages upon time.

The validity for this model is verified by experimental measurements. Extendable self-assembly of pi-conjugated polymers Paper Author s : Show Abstract. Structural control of pi-conjugated polymers in the solid state is a challenging task to improve the charge-carrier transport along the conjugated solid thin films. The intrinsic amorphous character prevents the polymers from organizing into a controlled structure by conventional solution film procedures such as spin- and drop-casting.

Here, we introduced how to optimize pi-conjugated structures of regioregular poly 3-hexyl thiophene -based polymers with well-defined molecular weights 3. Archive Journals. All Journals. New Titles. Pick and Choose. Literature Updates. For Members. For Librarians. RSS Feeds. Chemistry World. Education in Chemistry. Open Access.

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