A5027661255- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Chalcogenide Semiconductor Thin Films
- Advanced ceramic materials synthesis
- Nuclear Materials and Properties
- Photovoltaic System Optimization Techniques
- Advanced materials and composites
- Particle physics theoretical and experimental studies
- Quantum Dots Synthesis And Properties
- Physics of Superconductivity and Magnetism
- Radiation Effects in Electronics
- High-Energy Particle Collisions Research
- Advanced Semiconductor Detectors and Materials
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Semiconductor Quantum Structures and Devices
- Nuclear materials and radiation effects
- Magnetic confinement fusion research
- MXene and MAX Phase Materials
- Graphite, nuclear technology, radiation studies
- Fusion materials and technologies
- Plasma Applications and Diagnostics
- Superconducting Materials and Applications
- Semiconductor materials and interfaces
- Advanced Condensed Matter Physics
RIKEN Center for Advanced Photonics
2024
RIKEN
2023-2024
Nippon Soken (Japan)
2023
Kyoto University
1999-2023
Tohoku University
2015-2022
Japan Atomic Energy Agency
2017-2021
Tohoku University Hospital
2021
Advanced Institute of Materials Science
2020
Osaka Prefecture University
2015-2017
Toyota Technological Institute
2017
The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC verify hadronic-interaction models used in cosmic-ray physics. Forward baryon production one of crucial points understand development showers. We report neutron-energy spectra for s=7 TeV proton–proton collisions with pseudo-rapidity η ranging from 8.81 8.99, 8.99 9.22, and 10.76 infinity. measured energy obtained two independent calorimeters Arm1 Arm2 show same characteristic feature before unfolding detector...
The zero-point of indentation depth in nanoindentation or depth-sensing instrumented tests should be precisely set to evaluate the hardness and elastic modulus materials tested, especially at shallow depths. A critical contact stiffness value has been widely used determine with a Berkovich tip using continuous measurement (CSM) method. However, this criterion occasionally gives an inadequate owing surface roughness materials, vibration testing system, flaws CSM method depth. This study...
Alumina-forming FeCrAl oxide dispersion strengthened (ODS) ferritic alloys are considered as promising structure materials for the next-generation nuclear reactors. Current work is aimed at investigating Fe ion irradiation effect on alumina scale formed ODS alloy. A single alpha-alumina layer with a thickness of about 0.7 µm was surface alloy by pre-oxidation process 1000 °C 9 h. The pre-oxidized specimen subsequently irradiated using 6.4 MeV Fe3+ beam to 2 dpa 500 °C. Nanoindentation...
Decommissioning the Fukushima Daiichi nuclear power plant (1F) after accident caused by a tsunami in 2011 requires characterization of fuel debris dose distribution measurement. This paper describes experimental and theoretical behavior radiation detector applied with InGaP solar cells is investigated allow localization debris. In irradiation test, it was observed that radiation-induced current output increases linearly increasing rates 60Co γ-rays. For measurements at low rates, becomes...
Abstract Silicon space solar cells are currently attracting attention again for their relatively low‐cost feature with sufficient performance, and they expected to resume into the market especially by short‐term mission spacecraft designers. In this paper, efficiency potential of crystalline Si is analyzed considering external radiative (ERE), voltage fill factor losses. Crystalline have more than 26% realizing ERE 20% from about 0.2% normalized resistance less 0.05 around 0.15. Nonradiative...
The performance of InGaP solar cells irradiated with electron beams at energies lower than the damage threshold is degraded. To investigate irradiation effect, GaAs and are 70 keV beams. Measurements electroluminescence external quantum efficiency, in addition to light current voltage measurement, conducted. results show that cell, mainly open-circuit voltage, degraded affected by nonradiative recombination centers, while cell hardly comparison experimental prediction from displacement dose...
InGaP solar cells are not predicted to be susceptible displacement damage by irradiation with electrons at energies lower than 100 keV from non-ionizing energy loss (NIEL) calculations. However, it is recently observed that shown degrade 60 electrons. This degradation considered caused radiation defects but clear. In this study, the kind of generated found deep-level transient spectroscopy (DLTS). The result DLTS indicates prediction primary knock-on atoms using model different experiment....
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Four V-Ta-4Cr-4Ti quaternary alloys containing different quantities of Ta were investigated to determine the effect content on Charpy impact properties. Five button-shaped ingots V-4Cr-4Ti ternary alloy and V-xTa-4Cr-4Ti (x = 3, 9, 15, 22 wt.%) fabricated a laboratory scale by using non-consumable arc-melting in an argon atmosphere. tests conducted at temperatures ranging from 77 K 293 instrumented tester. Both upper shelf energy ductile–brittle transition temperature increased with...
Neutrons are analyzed in various fields such as space exploration, neutron radiography, and medicine. When neutrons employed, a detector is required to control the exposure dose. However, issues radiation tolerance, response linearity, γ-ray noise limit development of effective detectors. Metal halide perovskite based direct conversion detectors exhibit attractive characteristics being solution-processable at low temperatures possessing tunable band gaps, trap density, high charge carrier...
Abstract Compact and radiation-tolerant radiation dosimeter without bias voltage application using solar cells such as CdTe was proposed for severe environment near a nuclear reactor pressure vessel. In this work, γ -ray tolerance detection characteristics of were investigated. It found that the cell has sufficient against exposure up to 3 MGy. demonstrated induced current density linearly increased with increasing intensity in range approximately 1.5 kGy h −1 . This result indicates high...
Abstract The investigation of the radiation degradation characteristics InGaP space solar cells is important. In order to understand mechanism by samples cell were irradiated in vacuum and at ambient temperature with electron beams from a Cockcroft‐Walton type accelerator Osaka Prefecture University. threshold energies for recoil obtained theoretical calculation. fluences 60 400 keV 3×10 14 16 cm ‐2 , respectively. light‐current‐voltage measurements performed. Isc caused defects related...
Advanced Si solar cells such as passivated emitter, hetero-junction and back contact are expected to use space cells. In this paper, efficiency potential of crystalline is analyzed by considering external radiative (ERE), voltage fill factor losses. Crystalline have more than 26% at AM0 realizing ERE 20% from about 0.2% normalized resistance less 0.05 around 0.15. Non-radiative recombination losses in also discussed. Radiation degradation analyzed. Potential advanced for applications...
Manganese-doped zinc sulfide electroluminescent (EL) films were prepared for the first time by a hot wall technique with Mn planar doping. Undoped and Mn-doped ZnS on glass substrates exhibit preferred cubic (111) orientation at substrate temperature of 280°C. The Δ2θ value (full width half-maximum) 111 reflection ZnS:Mn film in an X-ray diffraction pattern was found to be improved increase concentration thickness. By means secondary ion mass spectroscopy (SIMS) electron spin resonance (ESR)...
Partially stabilized zirconia (PSZ) is considered for use as an oxygen-sensor material in liquid lead-bismuth eutectic (LBE) alloys the radiation environment of acceleration-driven system (ADS). To predict its lifetime operating ADS, effects on PSZ were clarified this study. A tetragonal was irradiated with 100 keV electrons and analyzed by X-ray diffraction (XRD). The results indicate that phase transition PSZ, from to monoclinic phase, caused after irradiation. deposition energy lattice...
Abstract To investigate the applicability of radiation-hard indium–gallium–phosphide (InGaP) and copper–indium–gallium–sulfide–selenide (CIGS) solar cells to dosimeter devices without any modification, we irradiated high-energy He + ions, which were simulated α -ray particles, an InGaP a CIGS cell. We found that both types have sufficient resistance ions. By using displacement damage dose (DDD) analysis, obtained ion-induced degradation trends compared with those induced by electrons...
The LHCf experiment, optimized for the study of forward physics at LHC, completes its main program in this year 2015, with proton-proton collisions energy 13 TeV.LHCf gives important results on neutral particles extreme pseudo-rapidity, both and proton-ion interactions.These are an reference tuning models hadronic interaction currently used simulation atmospheric showers induced by very high cosmic rays.The analysis future perspective presented paper.