We report structural and electrical transport properties of a family π-stacking soluble organic semiconductors, N,N'-dialkyl-3,4,9,10-perylene tetracarboxylic diimides (alkyl − pentyl [1], octyl [2], dodecyl [3]). The structures evaporated polycrystalline films 1−3 were studied using X-ray diffraction atomic force microscopy. Films pack similarly with the direction π−π overlap in substrate plane. Organic thin film transistors (OTFTs) based on deposited SiO2 gate dielectric showed linear...

Thin‐film transistors (TFTs) based on a new n‐channel organic semiconductor (DCMT; see Figure) are reported. An electron mobility as high 0.2 cm 2 /V s was observed, well ambipolar TFT behavior. Variable temperature measurements reveal that conduction is activated, with small activation energy of 35 ± 10 meV. These results demonstrate quinoidal oligothiophenes promising class semiconductors for TFTs.

We describe gated four-probe measurements designed to measure contact resistance in pentacene-based organic thin-film transistors (OTFTs). The devices consisted of metal source and drain electrodes contacting a 300-Å-thick pentacene film thermally deposited on Al2O3 or SiO2 dielectrics with p-doped Si substrate serving as the gate electrode. Voltage-sensing leads extending into source-drain channel were used monitor potentials while passing current during voltage (VD) (VG) sweeps....

A terthiophene-based quinodimethane, 3',4'-dibutyl-5,5' '-bis(dicyanomethylene)-5,5' '-dihydro-2,2':5',2' '-terthiophene (1) was synthesized and crystallized. Compound 1 has a planar quinoid geometry that is stabilized by dicyanomethylene groups at each end of the molecule. In crystal molecule part dimerized face-to-face π-stack, with intermolecular spacings 3.47 3.63 Å, respectively. Cyclic voltammetry showed could be reversibly reduced oxidized in methylene chloride solution. Thin film...

We report structural and electrical properties in thin films of an n-channel organic semiconductor, N,N′-dipentyl-3,4,9,10-perylene tetracarboxylic dimide (PTCDI–C5). The structure polycrystalline PTCDI–C5 was studied using x-ray diffraction atomic force microscopy. Films order with single crystal-like packing, the direction π-π overlap is substrate plane. Organic film transistors (OTFTs) based on were fabricated hydrophobic hydrophilic substrates. OTFTs showed effective mobility as high 0.1...

Single-crystal organic field-effect transistors (SX-OFETs) with channel lengths of 1 and 100μm have been fabricated by adhering thin crystals tetracene to freshly ashed SiO2 substrates containing countersunk gold contacts. The intrinsic transport properties the single crystals, corrected for potential contact effects using a standard four-probe configuration, measured from room temperature down 4.2K. These OFETs exhibit mobilities as high 0.1cm2V−1s−1, subthreshold swings...

A common device geometry for measuring the electrical characteristics of organic semiconductors is thin-film field-effect transistor (OTFT). Mostly reasons cost, convenience, and availability, this usually involves depositing material on a prefabricated gate structure such as Si∕SiO2, surface chemistry which often modified with self-assembled monolayers. The interactions between these surfaces deposited can have profound effect growth resulting since most charge transport in structures...

Pentacene and tetracene show readily observable photoconductivity when illuminated with light in the blue part of visible spectrum. We measured change hydrostatic pressure single-crystal samples both materials. Possible mechanisms for observed increase are discussed. conclude that a carrier-mobility under is most likely to cause case pentacene. For tetracene, changes absorption spectrum range excitation wavelengths may also be significant. observe phase transition near 0.3 GPa agreement...

A new solution‐coated AMOLED technology is poised for large‐format commercial adoption. Improvements in intra‐ and inter‐pixel layer uniformity have driven displays to match or exceed evaporated AMLCDs short‐range uniformity.

We report results of electrical output and transfer characteristics for two top-contact pentacene thin-film transistors under hydrostatic pressure at room temperature. Strong reversible increases the drain current field-effect hole mobility with increasing were observed, in particular a device relatively low atmospheric pressure.

Abstract Cost‐effective and scalable patterning of OLED materials remains a key challenge in order for displays to achieve widespread FPD market penetration. We will review progress on multinozzle jet small‐molecule emissive layer using Gen. 4 scale printer. Periodic luminance non‐uniformity appears as stitching/swath marks present transitioning this technology from single Thickness and/or pass effects, under certain circumstances, can lead stitching. solutions stitching discuss full color...

Abstract DuPont Displays has developed a full set of high performance materials and solution processing technology to address the cost manufacturing AMOLEDs. Using wide variety custom modeling analytical approaches we have short long range film thickness control uniformity which is commercially viable at large glass sizes. In this paper describe some measurement methods developed, results measured.

DuPont recently announced the achievement of record performance in printed organic light emitting diode (OLED) displays, sufficient to enable future adoption OLED television. Printed devices have reliably achieved T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">50</sub> luminance lifetimes 29,000 (red), 110,000 (green) and 34,000 hours (blue) at typical television brightness.