Residual polymer (here, poly(methyl methacrylate), PMMA) left on graphene from transfer metals or device fabrication processes affects its electrical and thermal properties. We have found that the amount of residue after chemical vapor deposited (CVD) varies depending initial concentration solution, this influences performance field-effect transistors fabricated SiO2/Si. A PMMA solution with lower gave less exposure to acetone, resulting in p-type doping higher charge carrier mobility. The...

Recent progress in organic field-effect transistor (OFET) printing processes is reviewed, and a perspective on the future of field discussed. The principles underlying OFET techniques are introduced according to two categories: direct write transfer printing. A comprehensive overview use production also provided. Considerations for improving device performance using explored. Prior commercialization, must satisfy several requirements, as discussed here.

Organic electronic devices that use graphene electrodes have received considerable attention because is regarded as an ideal candidate electrode material. Transfer and lithographic processes during fabrication of patterned typically leave polymer residues on the surfaces. However, impact these organic semiconductor growth mechanism surface has not been reported yet. Here, we demonstrate remaining surfaces induce a stand-up orientation pentacene, thereby controlling pentacene such molecular...

A two-step CVD route with toluene as the carbon precursor was used to grow continuous large-area monolayer graphene films on a very flat, electropolished Cu foil surface at 600 °C, lower than any temperature reported date for growing graphene. Graphene coverage is higher of that unelectropolished one under same growth conditions. The measured hole and electron mobilities grown °C were 811 190 cm2/(V·s), respectively, shift Dirac point 18 V. asymmetry in carrier can be attributed extrinsic...

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...

We have devised a method to optimize the performance of organic field-effect transistors (OFETs) by controlling work functions graphene electrodes functionalizing surface SiO2 substrates with self-assembled monolayers (SAMs). The electron-donating NH2-terminated SAMs induce strong n-doping in graphene, whereas CH3-terminated neutralize p-doping induced substrates, resulting considerable changes electrodes. This approach was successfully utilized electrical properties and electronic devices...

We have devised a method to selectively fluorinate graphene by irradiating fluoropolymer-covered with laser. This fluoropolymer produces active fluorine radicals under laser irradiation that react but only in the laser-irradiated region. The kinetics of C-F bond formation is dependent on both power and thickness, proving fluorination occurs decomposition fluoropolymer. Fluorination leads dramatic increase resistance while basic skeletal structure carbon bonding network maintained....

Dual doping-driven perpendicular electric field with opposite directions remarkably increase the on/off current ratio of bilayer graphene field-effect transistors. This unambiguously proves that it is possible to open a bandgap two molecular dopants (F4-TCNQ and NH2-functionalized self-assembled monolayers (SAMs)) even in single-gate device structure. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...

Sensitive and selective detection of target gases is the ultimate goal for commercialization graphene gas sensors. Here, ultrasensitive n-channel sensors were developed by using n-doped with ethylene amines. The exposure to oxidizing such as NO2 leads a current decrease that depends strongly on number amine functional groups in various types Graphene doped diethylenetriamine (DETA) exhibits highest response, recovery, long-term sensing stability NO2, an average limit 0.83 parts per...

The effect of the solubility annealing solvent on performance poly(3-hexylthiophene) (P3HT):C61-butyric acid methyl ester (PCBM) solar cells is studied. short-circuit current (Jsc) and fill factor (FF) increase remarkably, regardless type solvent, whereas a reduction open-circuit voltage (Voc) (of 0.1−0.2 V) observed after annealing. Interestingly, both value Jsc power conversion efficiency (PCE) are higher for poor-solvent-annealed devices than good-solvent-annealed ones. A good vapor...

The ability to control the molecular organization of electronically active liquid-crystalline polymer semiconductors on surfaces provides opportunities develop easy-to-process yet highly ordered supramolecular systems and, in particular, optimize their electrical and environmental reliability applications field large-area printed electronics photovoltaics. Understanding relationship between nanostructure stability appropriate is key enhancing performance organic field-effect transistors...

Blending poly(3-hexylthiophene) (P3HT) and amorphous polystyrene (PS) using a marginal solvent (CH2Cl2) with temperature-dependent solubility allows reduction of the semiconductor content to as low 3 wt% without considerable degradation field-effect electronic properties. Morphological structural studies reveal that P3HT molecules in these blends form highly crystalline, interconnected nanofibrillar networks. Detailed facts importance specialist readers are published ”Supporting...

A semiconductor-top and dielectric-bottom bilayer structure is fabricated by surface-induced vertical phase separation of poly(3-hexylthiophene) (P3HT) poly(methyl methacrylate) (PMMA) blends (see figure). This allows to prepare high-performance, low-semiconductor-content, low-voltage-driven TFTs in a very effective method, which the dielectric semiconductor layers are deposited onto substrate one-step process. Supporting information for this article available on WWW under...

Transparent, flexible carbon-based pentacene field-effect transistors (FETs) were successfully fabricated from monolayer graphene electrodes on plastic substrates. One-atom-thick provides an ideal material for source/drain efficient charge injection and transport, resulting in low contact resistance between the films. Thus, FETs with patterned exhibit significantly higher performances than those of common metal electrodes. Detailed facts importance to specialist readers are published as...

Phenyl isocyanate-functionalized and hydrazine-reduced reduced graphene oxide (rG-O) is treated to produce chlorinated rG-O (Cl-rG-O) platelets. The dielectric constant of the composite film containing Cl-rG-O shows a 5.5-fold increase over that composites untreated this cyanoethyl-based polymer, consequence combination polar polarizable C–Cl bonds increased interfacial polarization. As service our authors readers, journal provides supporting information supplied by authors. Such materials...

Despite the considerable efforts applied toward developing stretchable electronics, few intrinsically semiconductors have been reported that retain original electrical characteristics under stretching. This study introduces an and transparent organic semiconducting layer by blending self‐assembled nanowires (NWs) of semiconductor with elastomeric polymer. Blends poly(3‐hexylthiophene) (P3HT) NWs poly(dimethylsiloxane) (PDMS) yield P3HT NW networks embedded in PDMS matrix. Interestingly, it...

Recent studies of the bias‐stress‐driven electrical instability organic field‐effect transistors (OFETs) are reviewed. OFETs operated under continuous gate and source/drain biases these bias stresses degrade device performance. The principles underlying this discussed, particularly mechanisms charge trapping. There three main charge‐trapping sites: semiconductor, dielectric, semiconductor‐dielectric interface. phenomena in regions analyzed with special attention to microstructural dependence...

Abstract Solution‐processable functionalized acenes have received special attention as promising organic semiconductors in recent years because of their superior intermolecular interactions and solution‐processability, provide useful benchmarks for field‐effect transistors (OFETs). Charge‐carrier transport semiconductor thin films is governed by morphologies molecular orientation, so self‐assembly these during solution processing an important challenge. This article discusses the...

Hydrophobic self-assembled monolayers (SAMs) with alkyl chains of various lengths were inserted between CVD-grown graphene layers and their SiO2 substrates (figure). As the SAM chain length increased, substrate-induced doping was suppressed by ordered close-packed structure SAMs long chains. Accordingly, transistors constructed on exhibited higher electron/hole mobilities lower Dirac point voltages. Graphene has received considerable attention as a potential alternative material for use in...

Here, we demonstrate that the assembly of nanostructures with different dimensionalities yields "multicomponent hybrid" transparent conductive films (TCFs) sheet resistance and optical transmittance comparable to indium tin oxide (ITO) films. It was shown single-component Ag nanowire (NW) can be further decreased by introducing gold-decorated reduced graphene (RG-O) nanoplatelets bridge closely located noncontacting metal NWs. RG-O act as a protective adhesive layer for underneath NWs,...

Semiconductor nanowire arrays integrated vertically on graphene films offer significant advantages for many sophisticated device applications. We report van der Waals (VDW) epitaxy of InAs nanowires aligned substrates using metal-organic chemical vapor deposition. The strong correlation between the growth direction and surface roughness was investigated various with different numbers stacked layers. Notably, well-aligned were obtained easily single-layer sufficiently VDW attraction. This...

The optical constants, bandgaps, and band alignments of mono-, bi-, trilayer WS2 were experimentally measured, an extraordinarily high dependency on the number layers was revealed. refractive indices extinction coefficients extracted from optical-contrast oscillation for various thicknesses SiO2 a Si substrate. bandgaps few-layer both optically electrically indicating exciton-binding energies. Schottky-barrier heights (SBHs) with Au/Cr contact also extracted, depending (1–28). From...

Chemical doping can decrease sheet resistance of graphene while maintaining its high transparency. We report a new method to simultaneously transfer and dope chemical vapor deposition grown onto target substrate using fluoropolymer as both the supporting layer. Solvent was used remove significant fraction fluoropolymer, but residual polymer remained that doped significantly. This contrasts with more widely layer, polymethylmethacrylate, which does not induce during transfer. The mechanism be...

RGO electrodes with work functions that can be widely tuned using direct surface functionalization are demonstrated by self-assembled monolayers anchored onto the surfaces of electrodes, which remarkably enhance device performance organic field-effect transistors. As a service to our authors and readers, this journal provides supporting information supplied authors. Such materials peer reviewed may re-organized for online delivery, but not copy-edited or typeset. Technical support issues...

The recent advancement in transient electronics has proposed environmentally responsible technologies and bioresorbable devices response to the growing concern about electronic waste (e-waste) demand for physiologically friendly epidermal electronics, respectively. selection of materials development such is crucial achieving key properties, including biodegradability, biocompatibility, flexibility. This study designed discover demonstrate suitability silk proteins, specifically fibroin...