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Shigeki Naka - IEEE Xplore Author Profile

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We have researched on patterned emission of organic light-emitting diodes. The organic layer was deposited followed by laser patterning in atmosphere. The laser irradiation part was quenched, and it was shown that arbitrary patterning was possible. This technique is expected as a fabrication technique for an on-demand pattern emission.Show More
We have investigated a perovskite photo-sensors with electron-beam evaporated titanium dioxide (TiO2) film as an electron transport buffer layer. The TiO2 films have been deposited on indium-doped tin oxide (ITO) glass substrate at room temperature. Then, prepared TiO2 films are annealed at different temperatures of between room temperature and 500°C. Device structure is ITO/TiO2/Perovskite layer/...Show More
The aim of this paper is to investigate the photovoltaic performance of perovskite solar cells (PeSCs) with E-beam evaporated TiO2 films prepared on fluorine doped tin oxide (FTO) substrate at room temperature (RT, 25°C) and 160°C substrate temperature conditions. The effect of substrate temperature on the structural, optical, and surface morphological properties of E-beam evaporation (EBE) of TiO...Show More
The aim of this work is to fabricate perovskite solar cells (PSCs) with α-NPD and electron-beam evaporated TiO2 electrode, where α-NPD used as hole transport layer (HTL) and TiO2 used as an electron transport layer (ETL). The TiO2 electrode has been deposited on indium-doped tin oxide (ITO) coated glass substrate by electron beam evaporation (EBE) technique and then these films are sintered with 4...Show More
We have fabricated pentacene and C6-DNT-V-based organic thin film transistors (OTFTs) with various types of interfacial layer. Eight different kinds of OTFTs were fabricated without and with interfacial layers (CT4112, PMMA, Cytop, OTS, HMDS, Ta2O5 and Si3N4). The surface properties of contact angle and electrical properties of OTFTs include charge carrier mobility, threshold voltage, and on/off c...Show More
Semi-transparent organic light-emitting diodes were fabricated using lamination process. Indium-tin-oxide (ITO) was used for both electrodes as anode and cathode. Device characteristics were dramatically improved to coat ultra-thin polyethylenimine ethoxylated (PEIE) layer on ITO cathode. Transmittance of over 50% was obtained above wavelength of 510 nm. Bright emission of 8,700 cd/m2 was obtained...Show More
We report on gate-bias and temperature dependence of pentacene-based organic thin film transistors (OTFTs) with MoO3/Au contacts. In this study, we confirmed to obtain nearly zero activation energy (EA) without applied gate biases at a temperature between 133 K and 293 K. By increasing gate voltage, the activation energy for pentacene-based OTFT decreases concurrently. The effect of activation ene...Show More
Organic Thin-Film Transistors (OTFTs) using thienoacene-based organic semiconductors with various insulating interfacial layers (IILs) between the organic semiconductor and the dielectric layer were investigated. A field-effect mobility and threshold voltage of OTFT without interfacial layer using C8-BTBT were 1.85 cm2/Vs and -5 V, respectively. By inserting the IIL especially for 2nd polymer mate...Show More
We have fabricated a top contact pentacene-based organic thin-film transistors (OTFTs) with bi-layer WO3/Au electrodes. We have obtained that the performance and the field-effect mobility of the devices with bilayer WO3/Au electrode was highly improved by comparing with pentacene based transistor without WO3 layer. The field-effect mobility was increased from 0.47 cm2/Vs to 0.69 cm2/Vs in the devi...Show More
Organic optical photodiodes (OPDs) have attracted considerable interest in fields using photonic devices because they present the potential for use as flexible photodetectors for large areas. To elucidate their applicability to radiation measurements, OPDs with a classical heterojunction structure were fabricated and used for X-ray measurements. The device, whose structure was ITO (150 nm)/ ¿-NPD ...Show More