Abstract With the aim of enhancing field‐effect mobility by promoting surface‐mediated two‐dimensional molecular ordering in self‐aligned regioregular poly(3‐hexylthiophene) (P3HT) we have controlled intermolecular interaction at interface between P3HT and insulator substrate using self‐assembled monolayers (SAMs) functionalized with various groups (–NH 2 , –OH, –CH 3 ). We found that, depending on properties surface, nanocrystals adopt two different orientations—parallel perpendicular to...

Abstract We have demonstrated the influence of evaporation‐induced flow in a single droplet on crystalline microstructure and film morphology an ink‐jet‐printed organic semiconductor, 6,13‐bis((triisopropylsilylethynyl) pentacene (TIPS_PEN), by varying composition solvent mixture. The ringlike deposits induced outward convective droplets randomly oriented structure. addition dichlorobenzene as evaporation control agent results homogeneous due to slow evaporation, but molecular orientation is...

Recent technological advances in organic field-effect transistors (OFETs) have triggered intensive research into the molecular and mesoscale structures of semiconductor films that determine their charge-transport characteristics. Since structure morphology an are largely determined by properties interface between film insulator, a great deal has focused on engineering. We review recent progress engineering for fabrication high-performance OFETs and, particular, interfaces semiconductors...

Blending organic semiconductors with insulating polymers has been known to be an effective way overcome the disadvantages of single-component for high-performance field-effect transistors (OFETs). We show that when a solution processable semiconductor (6,13-bis(triisopropylsilylethynyl)pentacene, TIPS-pentacene) is blended polymer (PS), morphological and structural characteristics blend films could significantly influenced by processing conditions like spin coating time. Although vertical...

Single-crystal polythiophene microwires with unprecedented electrical characteristics such as low resistance (0.5 MΩ), a channel current high 25 μA, and well-resolved gate modulation (see figure) have been obtained by specific control over the supramolecular organization of individual polymer chains, which show preferential well-ordered interchain stacking along wire axis. This approach offers promising protocol for new flexible electronics.

Abstract With the aim of enhancing field‐effect mobility self‐assembled regioregular poly(3‐hexylthiophene), P3HT, by promoting two‐dimensional molecular ordering, organization P3HT in precursor solutions is transformed from random‐coil conformation to ordered aggregates adding small amounts non‐solvent acetonitrile prior film formation. The ordering significantly increases crystallinity thin films. It found that with appropriate concentration solution, resulting nanocrystals adopt a highly...

Device performances of BHJ solar cells based on poly[(4,4-didodecyldithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,1,3-benzoxadiazole)-4,7-diyl]and PC71BM improve by capping the chain ends with thiophene fragments. This structural modification yields materials that are more thermally robust and can be used in devices thicker films – important considerations for enabling mass production plastic cells. Detailed facts importance to specialist readers published as "Supporting Information". Such...

Abstract Spin-coating has been used extensively in the fabrication of electronic devices; however, effects processing parameters have not fully explored. Here, we systematically characterize spin-coating time on microstructure evolution during semiconducting polymer solidification an effort to establish relationship between this parameter and performances resulting field-effect transistors (FETs). We found that a short few seconds dramatically improve morphology molecular order conjugated...

The LiFePO4 surface is coated with AlF3 via a simple chemical precipitation for aqueous rechargeable lithium ion batteries (ARLBs). During electrochemical cycling, the unfavorable side reactions between and electrolyte (1 M Li2SO4 in water) leave highly resistant passivation film, which causes deterioration performance. by 1 wt % has high discharge capacity of 132 mAh g-1 improved cycle life, shows 93% retention even after 100 cycles, whereas pristine specific 123 poor 82%. analysis results,...

Low-temperature performance of the rechargeable batteries is limited because a narrow temperature range electrolyte. Despite aqueous electrolyte having lower freezing point than ethelyenecarbonate for conventional lithium-ion batteries, its as high 0 °C. Antifreeze additive ethylene glycol solutions used to improve low-temperature batteries. The suitable contents expand electrolyte, pursuing balance between low and ionic conductivity, thus enhancing their cyclic decreasing polarization...

The authors report the fabrication of one-dimensional crystal arrays triisopropylsilylethynyl pentacene (TIPS PEN) via simple drop casting on a tilted substrate. By pinning solution droplet substrate, an array ribbon-shaped crystals aligned in direction was formed X-ray diffraction analysis revealed that these were oriented growth direction. A thin film transistor based such TIPS PEN found to have high field-effect mobility 0.3cm2∕Vs, which results from directed organization π-conjugated molecules.

A key issue in research into organic thin-film transistors (OTFTs) is low-voltage operation. In this study, we fabricated a pentacene transistor with an ultrathin layer of polyvinyl alcohol (9nm) as gate insulator, and obtained device excellent electrical characteristics at low operating voltages (below 2V). This was found to have field-effect mobility 1.1cm2∕Vs, threshold voltage −0.98V, exceptionally subthreshold slope 180mV/decade, on/off current ratio 106. favorable combination...

Abstract Summary: Nanowire lengths and length‐to‐width aspect ratios in regioregular poly(3‐hexylthiophene) (P3HT) were simply controlled through changes the solvent vapor pressure during solidification. It is demonstrated that nanowires grew by rod‐to‐rod association, which molecular long axis of P3HT chains appeared to be well‐oriented parallel silicon substrate (Si/SiO x ). The formation took place one dimensional self‐assembly, governed π ‐ stacking units. TEM high contrast images...

The relationship between the electrical properties and microstructure of poly(3-hexylthiophene) (P3HT) films doped with an electron acceptor, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) has been studied. introduction F4-TCNQ in very small quantities improved device performance P3HT thin-film transistors significantly. field-effect mobility a only 0.2wt% was enhanced by factor 30 respect to that pure device. threshold voltages can also be controlled adjusting concentration....

We reviewed recent advances in high-performance organic field-effect transistors (OFETs) based on semiconductor/insulator polymer blends. Fundamental aspects of phase separation binary blends are discussed with special attention to phase-separated microstructures. Strategies for constructing semiconductor, semiconductor/dielectric, or semiconductor/passivation layers OFETs by blending semiconductors an insulating discussed. Representative studies that utilized such blended films the...

Abstract Tuning of electrical properties 2D materials by self‐assembled monolayers (SAMs) is reviewed in this article. When such as graphene and transition metal dichalcogenides (TMDs) are contact with SAMs, end functional group SAMs governs dipole moment thereby affecting shift Fermi level for instantaneous doping materials. Accordingly, carrier density, work function, and/or field‐effect mobility changed the contact. Recent advances SAMs‐induced changes introduced considering two types...

Understanding the vertical phase separation of donor and acceptor compounds in organic photovoltaics is requisite for control charge transport behavior achievement efficient collection. Here, vertically phase‐separated morphologies poly(3‐hexylthiophene):[6,6]phenyl‐C61‐butyric acid methyl ester (P3HT:PCBM) blend films are examined with transmission electron microtomography, dynamic secondary ion mass spectroscopy, X‐ray photoelectron spectroscopy. The 3D processed analyzed how solvent...

Because of their high porosity, metal-organic framework (MOF) materials have attracted much attention for use in gas-sensing applications. However, problems with the processability MOFs reliable electronics remain unsolved. Herein, combination strong gas-adsorbing properties MOF nanomaterials and organic thin-film transistor-type chemical sensors is proposed experimentally demonstrated. The hybrid blend system inorganic semiconductors likely exhibits thermodynamic instability because each...

With the aim of improving field-effect mobilities in poly(3-hexylthiophene) (P3HT) thin film transistors, we controlled nanostructures P3HT by changing solvent vapor pressure a spin-coating chamber during solidification. The transistors with films spin-coated under high (56.5 KPa), showing one-dimensional nanowire morphologies, resulted relatively (0.02 cm2/(V·s)) that are typically more than 1 order magnitude higher those prepared ambient conditions, featureless morphologies. This can be...

In order to investigate the effects of permanent dipoles on insulator surfaces electrical properties organic thin-film transistors, authors fabricated insulators with various self-assembled monolayers and similar surface energies. Surprisingly, they found that field-effect mobility pentacene transistors increases by a factor approximately 20 for an electron-withdrawing group. This remarkable increase in is due hole density arises from increased band bending insulator/semiconductor interface.