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Thermally evaporated tungsten oxide (WO 3 ) films are investigated as a buffer layer on anodes to improve the performance of bulk-heterojunction solar cells based on poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl C 61 butyric acid methyl ester (PCBM-60). Characterization of the WO 3 film under...
We have developed a technique for the preparation of thin film transistors (TFTs) through the self-patterning of various organic and inorganic materials via solution processing using a wide range of solvents. To obtain selectively self-patterned layers, we treated the oxide dielectric with...
Spin excited states in an organic ferromagnet are proposed and investigated on the basis of an extended SSH + Heisenberg (SSH = Su-Schrieffer-Heeger) model. It is found that a spin excited state will form a local distortion of the spin density wave (SDW) of π-electrons while the lattice...
A recyclable multilayer coated fiber-based substrate combining sufficient barrier and printability properties for printed functional devices was developed using reel-to-reel techniques. The substrate consists of a mineral pigment layer coated on top of a barrier latex layer. The pigment layer...
We have studied an organic photovoltaic cell based on an efficient donor/acceptor combination of pentacene/ N , N ′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C 8 ) heterojunctions. Photocurrent spectra exhibited excellent light harvesting throughout the visible spectrum with maximum...
A new polymeric gate dielectric interlayer of a cross-linkable poly(styrene- random -methylmethacrylate) copolymer is introduced with a good thermal and chemical resistance in bottom gate Ferroelectric Field Effect Transistor (FeFET) memory with pentacene active layer and ferroelectric...
It was recently demonstrated that the hopping mobility in disordered organic semiconductors depends both on the charge carrier concentration and on the density of states but their relative influence is still an open question. The mobility is almost constant below a certain concentration and...
Organic thin-film transistors (OTFTs) using high dielectric constant material tantalum pentoxide (Ta 2 O 5 ) and benzocyclobutenone (BCBO) derivatives as double-layer insulator were fabricated. Three metals with different work function, including Al (4.3 eV), Cr (4.5 eV) and Au (5.1 eV), were...
High efficiency red phosphorescent organic light-emitting diodes have been developed using a spirobenzofluorene type phosphine oxide (SPPO2) as a host material. The SPPO2 had a high glass transition temperature of 119 °C and a smooth surface morphology with a surface roughness less than 1 nm....
We have prepared efficient red organic light-emitting diodes (OLEDs) incorporating 2,7-bis(diphenylphosphoryl)-9-(4-( N , N -diphenylamino)phenyl)-9-phenylfluorene (POAPF) as the host material doped with the osmium phosphor Os(fptz) 2 (PPh 2 Me) 2 (fptz =...
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