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We investigated the effects of oxygen in amorphous silicon (a-Si) and polycrystalline silicon (poly-Si) thin films using excimer laser annealing (ELA). The dehydrogenation process prior to ELA was performed in air and N2 ambient, which was the method controlled oxygen content in a-Si thin films. We observed that the thin film of oxygen controlled process had lower oxygen concentration and oxidized...
We have developed highly transparent color liquid crystal display (LCD) using newly developed scattering-type liquid crystal, which shows transparent state when voltage is not applied, with field sequential color (FSC) driving method without employing color filter and polarizer. Furthermore the light is directly introduced to the panel glass substrates from the edge of the substrates (not from back...
Retinal Imaging Laser Eyewear has a miniature laser projector inside the frame which provides the wearer with digital image information through the pupil using the retina as a screen. This compact universal-design eyewear features focus-free and augmented-reality image independent of the wearers' visual acuity and point of focus. This paper describes the background of this technology, the principle...
The characteristics of polymer photodetectors based on a blend of a donor, poly(3-hexylthiophene) (P3HT), and an acceptor, fullerene derivative [6-6]phenyl-C61-butyric acid methyl ester (PCBM) using Ga-doped ZnO (GZO) electrodes modified by phosphonic acid-based self-assembled monolayer treatment in a short time are investigated. The characteristics of the conventional device with GZO modified by...
In the present work, post-annealing modification in air was performed on the MoO3 films and its effect on the optoelectronic characteristics of organic light-emitting diodes (OLEDs) was investigated. When MoO3 was annealed at the proper temperature, the electroluminescent performances of OLEDs were improved. X-ray photoelectron spectroscopy (XPS) and Raman studies revealed that the air annealing process...
Transparent and conducting gallium (Ga) and fluorine (F) codoped ZnO (GFZO) thin films were deposited on glass substrates by RF magnetron sputtering in CF4/Ar atmosphere with a ZnO:Ga2O3 (3 wt%) target. The influence of post-deposition annealing temperature on the structural, electrical, and optical properties of GFZO thin films was investigated. XRD results indicated that all the films were polycrystalline...
Thin-film biological stimulation devices are a device that can be easily implanted into living bodies and stimulate living muscles, neurons, etc. In this study, we researched dependences of stimulation amperages on load resistance and phosphate buffered saline concentration. It was found that the stimulation device has a sufficient ability to stimulate the living body.
Four-terminal (4T) polycrystalline-germanium (poly-Ge) thin-film transistors (TFTs) are fabricated at 300 °C by metal induced crystallization (MIC) using copper (Cu) on a glass substrate. We observed variations in the performance for top gate (TG) and bottom gate (BG) drives, although the gate stacks of both drives are same. This difference results from the quality of the poly-Ge/BG SiO2 interface,...
Self-aligned four-terminal (4T) low temperature poly-Si TFTs with hafnium oxide (HfO2) gats dielectric were fabricatsd using nickel (Ni) metal-induced crystallization (MIC) on a glass substrate. The top gate (TG) and bottom gate (BG) were composed of HfO2 and SiO2 dielectric, respectively. We compared their performances under TG drive, BG drive, and connecting double gate mode. It was observed that...
In this work, a novel time-of-flight (TOF) measurement was carried out by employing an ultra-thin charge generation layer (CGL) of chloroboron subphthalocyanine and C60, which shows a highly absorption coefficient at 532 nm from Nd:YAG laser. This implies that the proposed CGL region can facilitate in generating huge number of charge carriers, i.e. holes or electrons in organic device under the pumping...
Two-dimensional (2D) layered materials have unique structural and electronic properties, which attract a great interest due to scientific novelty as well as many promising applications. In this talk, our recent progress of 2D materials research is reviewed mainly on the synthesis and characterizations of graphene and related 2D materials. Our studies on 2D heterostructures will be also discussed.
This report presents the methods to prepare high quality MAPbI3 film for the p-i-n (inverted) perovskite solar cell. A detailed step-by step to improve the grain size and thickness of MAPbI3 film and the photovoltaic performance of the corresponding cell were discussed. The results demonstrate that the grain size of MAPbI3 film (the film quality) directly related to the efficiency of perovskite solar...
Novel organic dyes (YH-1-YH-4) containing olefin or acetylene as the π-spacer linkage in the triarylene bridge were synthesised. The photophysical and electrochemical properties of the dyes were characterised, and the dyes were then to fabricate dye-sensitised solar cells (DSSCs). We demonstrated the use of the D-π-A dipolar system by employing arylamine derivatives as an electron donor, triarylene...
In this paper, Ti-doped GaZnO (GTZO) quaternary alloys were used as the transparent conductive oxides (TCOs) for Cu(In, Ga)SeSe2 (CIGS) solar cell application. These thin films are highly favorable for solar power systems. Photoluminescence measurement and X-ray diffraction were employed to investigate the GTZO thin films. Advantageous crystal quality was produced by radio-frequency magnetron sputtering...
As a key precursor for perovskite layer, we developed a complex of CH3NH3PbI3(dmf). The higher solubility of this complex in DMSO compared to the conventional PbI2 and CH3NH3I (1:1) mixture enables the fabrication of thick perovskite layer to give higher short-circuit current density (Jsc) in perovskite solar cells. In addition, the use of less volatile DMSO solution of this complex than DMF allows...
We developed lead-free perovskite solar cells, because lead is harmful to the human body. In this study, the lead-free perovskite layers were fabricated using antimony, bismuth and silver. Normal (n-i-p) and inverse (p-i-n) structures were tried for the solar cells. By using a lead-free perovskite with silver and bismuth for the normal structure, conversion efficiency of 0.892% was achieved.
Flexible ITO-lree P3HT:PC61BM solar cells with spin-coated silver nanowire transparent electrode are demonstrated. For conventional structure type of solar cells, the power conversion efficiency (PCE) of devices based on silver nanowire can reach around 2.29%. As for inverted structure type, the PCE of devices can reach 3.39%. The conventional and inverted flexible ITO based P3HT:PC61BM solar cells...
We suggest instant glue for passivation layer of indium-gallium-zinc oxide (IGZO) thin film transistors (TFTs). The instant glue is liquid in room temperature, thus we could easily drop the glue on the IGZO channel layer. As a result, the IGZO TFTs with glue passivation layer (GPL) showed improved electrical characteristics such as field effect mobility of 12.11 cm2/Vs, on/off ratio of 8.72×107, and...
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