Conjugated polymers have been widely studied as potential semiconductor materials for organic thin-film transistors (TFTs). However, they provided functionally poor transistor properties when the TFTs are fabricated in air. We developed a class of liquid crystalline regioregular polythiophenes, PQTs, that possess sufficient air stability to enable achievement excellent TFT under ambient conditions. These polythiophenes exhibit unique self-assembly ability and form highly structured thin...

A facile synthesis of stable silver nanoparticles having a particle size <10 nm is described. The involved reduction acetate with substituted hydrazine, such as PhNHNH2, in the presence 1-alkylamine, C16H33NH2, toluene at 25−60 °C. Spin-coated thin films or printed electronic features alkylamine-stabilized could be easily converted 120−160 °C into highly conductive elements conductivity 2−4 × 104 S cm-1. Organic thin-film transistors source/drain electrodes this nature exhibited field-effect...

A stable, high-mobility ZnO thin-film semiconductor was fabricated by thermal treatment of a solution-deposited thin film from solution Zn(OAc)2/2-ethanolamine in methoxyethanol. This composed closely packed single crystals (∼30 to 50 nm) having hexagonal structure assuming preferred orientation with its c-axis perpendicular the substrate. Field-effect mobility 5−6 cm2 V-1 s-1 and current on-to-off ratio 105−106 were demonstrated this transistors.

Poly(4,8-dialkyl-2,6-bis(3-alkylthiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene) 1 represents a new class of polymer semiconductors which self-assemble into higher structural orders without thermal annealing and provide excellent field-effect transistor performance with mobility up to 0.25 cm2 V-1 s-1 when used as solution-processed thin-film semiconductor in transistors.

Abstract Printed organic thin‐film transistors (OTFTs) have received great interests as potentially low‐cost alternative to silicon technology for application in large‐area, flexible, and ultra‐low‐cost electronics. One of the critical materials TFTs is semiconductor, which has a dominant impact on transistor properties. We review here structural studies design thiophene‐based polymer semiconductors with respect solution processability, ambient stability, molecular self‐organization,...

Proper functionalization of indolo[3,2-b]carbazole led to a new class high-performance organic semiconductors suitable for thin-film transistor (OTFT) applications. While 5,11-diaryl-substituted indolo[3,2-b]carbazoles without long alkyl side chains provided amorphous thin films upon vacuum deposition, those with sufficiently such as 5,11-bis(4-octylphenyl)indolo[3,2-b]carbazole self-organized readily into highly crystalline layered structures under similar conditions. OTFTs using channel...

Structurally ordered organic semiconductor nanoparticles, which form a stable nanoparticle dispersion in an appropriate liquid, are generated from regioregular poly(3,3‴-didodecylquarterthiophene) (PQT-12). This enables facile solution fabrication of high-performance layers composed extensive crystalline domains lamellar π–π stacks (see Figure), yielding thin-film transistors with excellent field-effect-transistor properties.

Thin-film transistor (TFT) backplanes fabricated by using jet printing as the only patterning method are reported. Additive and subtractive processes combined to make 128×128 pixel active matrix arrays with 340μm size. The semiconductor used, a regioregular polythiophene, poly[5,5′-bis(3-dodecyl-2-thienyl)-2,2′-bithiophene]; (PQT-12) is deposited inkjet exhibits average TFT mobility of 0.06cm2∕Vs, on/off ratios 106, minimal bias stress. printed TFTs have high yield narrow performance...

Strategically functionalized 5,11-dialkylindolo[3,2-b]carbazoles (see Figure) represent a novel class of high-mobility p-channel semiconductors for organic thin-film transistors. Specifically, 2,8-dichloro-substituted 5,11-didodecylindolo[3,2-b]carbazole, which forms highly crystalline films with large interconnecting terrace-like layered domain structures, has exhibited mobilities reaching 0.14 cm2 V–1 s–1 and current on/off ratios 107 under ambient conditions. Supporting information this...

Field-effect transistor properties, structural design, synthesis, and characterization of the poly(2,5-bis(2-thienyl)-3,6-dialkylthieno[3,2-b]thiophene) thin-film semiconductors shown in figure are described. Using low-temperature solution fabrication channel under ambient conditions, a mobility 0.25 cm2 V–1 s–1 current on/off ratio 107 obtained.

A simple and efficient approach to a printable silver conductor for organic electronics is described. Conductive features were prepared by annealing thin-film deposited from an alcoholic solution of acetate, ethanolamine, long-chain carboxylic acid. High electrical conductivity similar that vacuum-deposited could be achieved at relatively low processing temperature. Organic transistors with source/drain electrodes this provided excellent field-effect transistor properties.

A three terminal molecular memory device was monitored with in situ Raman spectroscopy during bias-induced switching between two metastable states having different conductivity. The structure is similar to that of a polythiophene field effect transistor, but ethylviologen perchlorate added provide redox counter-reaction accompany reactions. conductivity the layer reversibly switched high and low conductance "write/erase" (W/E) bias, while separate readout circuit polymer conductance....

A printable gold precursor composed of functionalized nanoparticles in a suitable liquid was used for printing conductive features organic thin-film transistors (see Figure). conductivity 105 S cm–1 is obtained after annealing at 140 °C under vacuum or 200 ambient conditions. Transistors using source–drain electrodes this type provide excellent performance, identical to that vacuum-deposited contacts.

The synthesis and field-effect transistor (FET) properties of a novel class indolocarbazole-based conjugated polymers, poly(indolo[3,2-b]carbazole)s, are described. Dehalogenative coupling polymerization dichloroindolo[3,2-b]carbazoles with Zn/NiCl2/PPh3/2.2'-dipyridil gave the corresponding while oxidative indolo[3,2-b]carbazoles FeCl3 proceeded regioselectively, affording poly(indolo[3,2-b]carbazole-2,8-diyl)s. Crystallization optical these polymers were different, depending on...

Polydomain films of liquid crystalline polymer (MACB-AB6) with low content (6 mol %) azobenzene units were prepared and irradiated linearly polarized light at 366 nm, thus inducing an alignment the photochromic side groups as well nonphotoactive mesogens, cyanobiphenyl groups. An induced order parameter, S, was obtained from UV IR spectroscopy, it increased increase in temperature first then decreased due to phase transition. The effect intensity on behavior has been investigated detail....

The synthesis of novel regioregular poly(4,8-didodecylbenzo[1,2-b:4,5-b']dithiophene) and its use as a semiconductor in organic thin-film transistors (OTFTs) are described. polymer was prepared from 2,6-dibromo-4,8-didodecylbenzo[1,2-b:4,5-b']dithiophene by dehalogenative coupling polymerization. A field-effect mobility ∼0.012 cm2 V-1 s-1 current on/off ratio ∼2.5 × 105 have been obtained with OTFTs using this semiconductor.

The silane self-assembled monolayer (SAM) modification of a SiO2 gate dielectric surface improved the molecular ordering organic channel semiconductor in thin-film transistors (OTFTs), leading to significant improvement transistor performance. Mobility up 0.18cm2∕Vs (current on∕off ratio 107) was obtained for OTFTs with liquid-crystalline polythiophene built on an octyltrichlorosilane-modified layer, 450 times over those nonmodified layer. mobility enhancement attributed edge-on orientation...

The synthesis, photooxidative stability, and field-effect transistor properties of a series 6,13-diethynyl-substituted pentacene derivatives are described. Substitution with appropriate solubilizing ethynyl functions at the C-6/C-13 positions pentacene, which promote extended π-electron delocalization from nucleus, leads to phenomenal enhancement in both solubility stability. This has enabled fabrication stable, solution-processed thin-film semiconductor under ambient conditions for...

A novel solution-processed, compositionally and structurally stable dual-layer gate dielectric composed of a UV-cured poly(4-vinyl phenol)-co-poly(methyl methacrylate) bottom layer thermally cross-linked poly(methyl silsesquioxane) top for organic thin-film transistors is described. This design, coupled with compatible solution-processable semiconductor conductor materials, has enabled fabrication all high-performance on flexible substrates. High field-effect mobility current on/off ratio,...

Oleic acid-stabilized silver nanoparticles prepared by a facile synthesis afforded highly conductive elements upon proper annealing. Regioregular polythiophene-based thin-film transistors (OTFTs) using source/drain electrodes from these provided excellent field-effect characteristics, despite significant difference between the work function of and HOMO polythiophene semiconductor. This was attributable to doping semiconductor interface residual oleic acid or its thermally transformed...

Stable, solution-processed, non-toxic, high-mobility thin-film semiconductors are required for fabricating low-cost transistor (TFT) arrays and circuits to enable ubiquitous large-area ultra electronics. Most reported date have been unable meet the mobility, stability, safety, cost requirements this emerging technology, thus precluding their adoption in practical applications. Here, we report preparation of stable, transparent, high performance zinc oxide (ZnO) via thermal processing...

A method for the fabrication of polymeric thin-film transistors (TFTs) by lamination is described. Poly(dimethylsiloxane) stamps were used to delaminate thin films semiconducting polymers from silicon wafers coated with a self-assembled monolayer (SAM) formed octyltrichlorosilane. These supported laminated onto electrode structures form coplanar TFTs. The process was make TFTs poly(3-hexylthiophene), P3HT, and poly[5,5'-bis(3-dodecyl-2-thienyl)-2,2'-bithiophene], PQT-12. TFTs, where these...

Most solution-processed organic semiconductors for thin film transistor applications require high-temperature annealing and/or fabrication in an inert atmosphere to achieve high mobility. Solution-processed poly(3,3' '-dialkylterthiophene) 3 was found provide functionally useful properties even when fabricated at room temperature under ambient conditions.

Gold nanoparticles stabilized with various alkanethiols were studied as printable precursors for fabricating electrically conductive elements printed electronics. nanoparticle features using stencil and microcontact techniques then converted to highly thin-film transistors (TFTs) at relatively low annealing temperatures. TFT devices source/drain electrodes of this nature exhibited similar or better field-effect transistor (FET) characteristics than those vacuum-evaporated gold electrodes....

Self-aligned printing is a recently developed bottom-up technique which utilizes the unique droplet motion on heterogeneous surfaces to define sub-100-nm critical features and surpasses resolution can commonly be achieved by direct two orders of magnitude. Here we extend this method, was originally implemented with conductive polymer inks, fabrication functional nanostructures gold nanoparticle ink. We also designed configuration where ink printed between lithographically defined patterns...