Showing papers in "Organic Electronics in 2005"

TL;DR: In this paper, a relationship between the energy of the highest occupied molecular orbital (HOMO) and the oxidation potential of molecular organic semiconductors is presented, based on an analysis of image charge forces on spherical molecules positioned near a conductive plane formed by the electrode in an electrochemical cell.

TL;DR: In this article, direct and inverse photoemission spectroscopy was used to investigate the electronic polarization induced by the pentacene anion and cation at the Au/pentacene interface.

TL;DR: In this article, regioregular poly(3-alkylthiophenes) (P3ATs) were studied regarding their optical and electrochemical properties and used as electron donors in polymer solar cells.

TL;DR: In this article, the effects of ambient exposure of a polycrystalline Au electrode prior to making contact with the hole-transport material N,N′-diphenyl-N, N′-bis (1-naphthyl)-1,1′-biphensyl-4,4′-Diamine (α-NPD) were investigated.

TL;DR: In this paper, a theoretical analysis on the light-extraction efficiency of organic light-emitting diodes was performed using finite-difference time-domain method and an analytic method such as the mode-expansion method.

TL;DR: In this paper, a bilayer cathode was proposed to enhance electron injection to red, green and blue electroluminescent (EL) polymers, thereby resulting in high efficiency polymer LEDs, which are comparable to that of using low work function metals such as Ca and Ba as cathode.

TL;DR: In this article, C60-based n-channel organic field effect transistors with mobility in the range of 4-1-cm2-V−1-s−1 were presented.

TL;DR: In this paper, the performance of small-molecular weight organic double heterojunction donor-acceptor bilayer solar cells is studied as a function of the purity of the donor material, copper phthalocyanine (CuPc).

TL;DR: In this article, photoresponsive organic field effect transistors (photOFETs) based on conjugated polymer/fullerene solid-state mixtures as active semiconductor layer and poly-vinyl-alcohol (PVA) or divinyltetramethyldisiloxane-bis(benzocyclobutene) (BCB) as gate dielectrics are presented.

TL;DR: In this article, the current in the forward direction was found to obey the diode equation and the conduction was controlled by thermionic emission mechanism for relatively higher voltages, conduction dominated by a space-charge-limited conduction mechanism with single trap level of 0.36 eV.

TL;DR: In this paper, the authors observed bistability in single layer devices made from fullerenes (C60) mixed with polystyrene (PS) and sandwiched between two Al electrodes.

TL;DR: In this article, a gate dielectric made of a bilayer PMMA/Ta2O5 where PMMA (poly(methyl methacrylate)) is spin-coated on top of an evaporated layer of Ta2O 5 is presented.

TL;DR: In this article, the authors have carried out studies using two different fullerene molecules, C60 and C70, and reported mobilities for C60 ranging from 0.02 cm2/V/s up to 0.65 cm 2/V

TL;DR: In this article, the authors describe a method for in-plane growth of millimeter-scale crystalline organic needles from initially amorphous thin films of the molecular organic semiconductor tris(8-hydroxyquinoline)aluminum (Alq 3 ).

TL;DR: In this article, a series of different blends of conjugated polymers poly(9,9-dioctylfluorene) [F8] and poly( 9, 9-dioxyllfluorenne-alt-benzothiadiazole] was investigated, and it was shown that the electroluminescence efficiency of the LED is a strong function of the relative composition of the blend, with highest efficiency occurring in blends of 95:5 F8:F8BT.

TL;DR: In this paper, the role of the density of states in determining the performance of amorphous organic devices was examined, and the authors concluded that a real DOS should have the attributes found in Gaussian density-of-states.

TL;DR: In this article, a set of polyaniline- and poly(3,4-ethylene dioxythiophene)-based materials were studied as hole injection layers in polymer light emitting devices.

TL;DR: In this paper, a patterning procedure based on laser-ablation in combination with the use of water-soluble sacrificial-resists was developed to pixelate different light emitting polymers (LEPs) on a surface, creating a simple array of light emitting diodes (LEDs).

TL;DR: In this article, the electronic density of states of copper phthalocyanine (CuPc) layers deposited onto hydrogen passivated Si(1 1 1) substrates was studied.

TL;DR: In this paper, the effect of the sodium and cesium ion surface concentration on the electronic properties of spin-coated poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) films, known as PEDOT:PSS, has been studied by means of ultraviolet and X-ray photoelectron spectroscopy.

TL;DR: In this paper, the electrodes were patterned from thin films of conducting polymers or metals using an excimer laser, which yields highly resolved source and drain electrode patterns with channel lengths below 10 μm.

TL;DR: In this paper, it is shown that whenever traps, distributed exponentially in energy, are governing the conduction in electrical materials, a Meyer-Neldel observation is expected, which is a direct result of the model incorporating a high density of traps by Shur and Hack.

TL;DR: In this article, a new exciplex emission was obtained employing hole-transporting material 4,4,4″-tris[3-methylphenyl(phenyl)amino]triphenylamine (m-MTDATA) doped in the electron-transport material 2,2,2″-(1,3,5-benzenetriyl)tris-[1-phenyl-1H-benzimidazole] (TPBI) with structures of ITO/mMTDATA (45nm)/NPB (5

TL;DR: In this paper, the authors used ultraviolet photoelectron spectroscopy (UPS) to determine the highest occupied molecular orbital (HOMO) energy levels of a series of related 2,2′-bipyridyl-substituted ruthenium dyes utilized in the fabrication of photovoltaic devices.

TL;DR: In this article, double-layer light-emitting diodes were fabricated with inorganic/organic hybrid composite as hole transporting layer, and two conjugated polymers, poly(9,9-dibutyl)fluorene (PDF) and a dendritic polyfluorne derivative, poly((9, 9-dibrutyl-2,7-diiodo-9H-fluorenea)trisphenylamine) (PDFA) were introduced as light-EMitting layer.

TL;DR: In this article, the performance of organic light-emitting diodes (OLEDs) with the configuration Al/Alq 3 (Aluminum Tris-(8-hydroxygninoline))/TPD(N,N′-diphenyl-N, N′bis-(3-methylphenyl)-1,l′-biphenyltipheny-4, 4,4′diamine)/ITO have been significantly improved by doping iodine (I 2 ) on both Alq 3 and TPD layers.

TL;DR: In this article, the electronic interaction between the transparent anode material indium tin oxide (ITO) and the common organic hole injection material copper phtalocyanine (CuPc) was investigated by means of angle-resolved UV photoemission.

TL;DR: In this paper, the performance of polymer field effect transistor (FET) devices is related to the choice of gate insulator material, the applied sample configuration and the order of layer deposition.

TL;DR: In this paper, the authors investigated the surface current stimulated by light in tetracene layers and concluded that the mechanism of the photocurrent stimulation results from triplet exciton-trapped charge carrier interaction, which leads to detrapping of charge carriers and enhancement of the current.

TL;DR: In this article, an analysis of recombination in bilayer organic light-emitting diodes using numerical simulations and analytical model is presented, which provides insight into charge accumulation and transport across the organic interface and explains the shift in recombination peak with changes in interfacial barrier heights.