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PRESENT AND FUTURE OF SUPER HIGH-EFFICIENCY TANDEM SOLAR CELLS
Yamaguchi, Masafumi The Korean Institute of Electrical and Electronic 1998 전기전자재료 Vol.11 No.11
In this paper, present status of super high-efficiency tandem solar cells has been reviewed and key issues for realizing super high-efficiency have also been discussed. In addition, the terretrial R&D activities of tandem cells, in the New Sunshine Program of MITI(Ministry of International Trade and Industry) and NEDO(New Energy and Industrial Technology Development Organization) in Japan are reviewed briefly. The mechanical stacked 3-junction cells of monolithically grown InGaP/GaAs 2-junction cells and InGaAs cells have reached the highest efficiency achieved in Japan of 33.3% at 1-sun AM1.5. This paper also reports high-efficiency InGaP/GaAs 2-junction solar cells with a world-record efficiency of 26.9% at AM0, 28$^{\circ}C$ and radiation damage recovery phenomena of the tandem cell performance due to minority-carrier injection under light illumination or forward bias, which causes defect annealing in InGaP top cells. Future prospects for realizing super-high efficiency and low-cost tandem solar cells are also described.
Masafumi Kobune,Hisashi Oshima,Akihiro Tamura,Kazuki Imagawa,Yusuke Daiko,Atsushi Mineshige,Tetsuo Yazawa,Hitoshi Morioka,Keisuke Saito,Hideshi Yamaguchi,Koichiro Honda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
a- and b-axis-oriented (Bi_(3.25)Nd_(0.75))Ti_3O_(12) films, 3.0 mm thick, were fabricated on conductive IrO_2(101)/Al_2O_3(012) and Nb:TiO_2(101) [Nb = 0, 0.05 and 0.79 mass%] substrates by high-temperature sputtering. A BNT film grown on an IrO_2(101)/Al_2O_3(012) substrate had a low crystallinity (2.83˚), a low degree of a- and b-axis orientations [a_((h00/0k0)) = 49.2%] and a dense microstructure that a- and b-axis-oriented crystals existed locally in the film, while a BNT film grown on Nb:TiO_2(101) substrate with 0.79 mass% Nb showed a high crystallinity (0.57˚), a high a_((h00/0k0)) (99.9%) and a porous microstructure that was comprised of many nanoplate-like crystals. It is shown that the BNT film grew with a heteroepitaxial relationship to the underlying Nb:TiO_2 substrate has a symmetric loop shape, with a remanent polarization (2P_r) of 29 mC/cm^2 and a coercive field (2E_c) of 297 kV/cm.
Collision prediction system using intermittent ultrasonic wave
Masafumi Tokiwa,Teruo Yamaguchi 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
In this paper we propose a method to determine using ultrasonic wave whether a moving object collides with observer and to predict time to collide in case of colliding with it. In previous study, in the case where a target is relatively close to an observer and is moving at low speed, collision detection was impossible. In order to resolve this problem, we constructed new algorithm that collision detection is performed using a trajectory of the moving object. We conduct experiments to confirm an usefulness of the algorithm actually. Experimental results show that it can work as a collision predictor.
Piezoelectric Properties of High-temperature-Poled Pb(Mn1/3Nb2/3)O3−PbZrO3−PbTiO3 Solid Solutions
Mizuyo Yamaguchi,Masafumi Kobune,Haruka Okuda,Takeyuki Kikuchi 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.4
The piezoelectric properties of high-temperature-poled high-density solid solutions with compositionsof xPb(Mn1/3Nb2/3)O3−yPbZrO3−zPbTiO3 (xPMnN−yPZ−zPT; PMnNZT) with x =0.020 − 0.180, y = 0.420 − 0.580, and z = 0.400 − 0.560 were investigated by using the resonantantiresonantfrequency method. The two optimal compositions that exhibited large values ofd33 · Qm(p), where d33 is the piezoelectric coefficient (longitudinal length mode) and Qm(p) is themechanical quality factor (radial mode) for high-power piezoelectric applications were x = 0.040, y= 0.540, and z = 0.420 in the rhombohedral and the morphotropic phase boundary (MPB) regionsand x = 0.095, y = 0.435, and z = 0.470 in the MPB and the tetragonal regions. By comparingthe maxima in d33 · Qm(p) for high-temperature (HT)-poled PMnNZT samples with the maximain d33 · Qm(p) for room-temperature (RT)-poled PMnNZT samples that had been previously reported,the ratio of d33 · Qm(p)HT /d33 · Qm(p)RT was approximately 1.8, exhibiting a significantimprovement due to HT-poling treatments.
Akiyoshi, Masafumi,Do, Duy Khiem,Yamaguchi, Ichiro,Kakefu, Tomohisa,Miyakawa, Toshiharu The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.3
Background: Crookes tube is utilized in junior high and high schools in Japan to study the character of electrons and current, and not for radiological education. There is no official guideline or regulation for these radiation source to the public. Therefore, most teachers have no information about the leakage of X-rays from Crookes tube. The peak energy of X-rays is approximately 20 keV, and it is impossible to measure using conventional survey meters. Materials and Methods: Each leakage dose of low energy X-rays from 38 Crookes tube in the education field, such as junior and senior high schools in Japan, was explored by the teachers in the school using radio-photoluminescence (RPL) dosimeters. Before and after the measurements, the dosimeters were sent by postal mails. Results and Discussion: At the exploration in this study, it was estimated that the 70 ㎛ dose equivalent, H<sub>p</sub>(0.07) of X-rays from 31 Crookes tubes were smaller than 100 µSv in 10 minutes, at the distance of 1 m, where the Crookes tube was usually observed. However, the highest dose was estimated as 0.69 mSv by an equipment with the full power. Furthermore, one Crookes tube exhibited 0.62 mSv with minimum output power of the induction coil. This relatively large dose was reduced by the shorter distance of discharge electrodes of the induction coil. Conclusion: The leakage dose of low energy X-rays from 38 Crookes tube was explored using RPL dosimeters. It was estimated that the H<sub>p</sub>(0.07) of X-rays from 31 Crookes tubes were smaller than 100 µSv in 10 minutes at the distance of 1 m, while some equipment radiated a higher dose. With this study, the provisional guideline for the safety operation of Crookes tube is established.
Hideto Tada,Masafumi Kobune,Koji Fukushima,Hisashi Oshima,Daisuke Horit,Akihiro Tamura,Yusuke Daiko,Atsushi Mineshige,Tetsuo Yazawa,Hironori Fujisawa,Masaru Shimizu,Hideshi Yamaguchi,Koichiro Honda 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
The structural characteristics, the mechanism of crystal growth, and the ferroelectric properties of partially Sm-substituted perovskite bismuth-samarium-nickel-titanate [(Bi1−xSmx)(Ni0.5Ti0.5)- O3; BSNT, x = 0− 0.9] thin films deposited on Pt(100)/MgO(100) substrates by rf sputtering have been investigated using X-ray diffraction, transmission electron microscope, and polarization - electric field hysteresis loop measurements. The fabricated BSNT samples with x≥0.6 were confirmed to have a single-phase perovskite structure. Of the four samples (x = 0.6 0.7, 0.8, and 0.9) with a single-phase perovskite structure, the c-axis-oriented epitaxial BSNT film with x = 0.9 exhibited the best hysteresis loop, with a remanent polarization of 2 μC/cm2 and a coercive field of 100 kV/cm. The structural characteristics, the mechanism of crystal growth, and the ferroelectric properties of partially Sm-substituted perovskite bismuth-samarium-nickel-titanate [(Bi1−xSmx)(Ni0.5Ti0.5)- O3; BSNT, x = 0− 0.9] thin films deposited on Pt(100)/MgO(100) substrates by rf sputtering have been investigated using X-ray diffraction, transmission electron microscope, and polarization - electric field hysteresis loop measurements. The fabricated BSNT samples with x≥0.6 were confirmed to have a single-phase perovskite structure. Of the four samples (x = 0.6 0.7, 0.8, and 0.9) with a single-phase perovskite structure, the c-axis-oriented epitaxial BSNT film with x = 0.9 exhibited the best hysteresis loop, with a remanent polarization of 2 μC/cm2 and a coercive field of 100 kV/cm.
Hisashi Oshima,Masafumi Kobune,Hideto Tada,Koji Fukushima,Hideshi Yamaguchi,Koichiro Honda 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
The formation mechanism of the perovskite structure, the structural properties, and the ferroelectric properties of bismuth lanthanoid nickel titanate (Bi1−xLnx)(Ni0.5Ti0.5)O3 (BLNT, Ln:La, Nd, or Sm, x = 0 − 0.9) thin films deposited on Pt(100)/MgO(100) substrates by sputtering have been investigated using X-ray diffraction and transmission electron microscopy. The present (Bi1−xLax)(Ni0.5Ti0.5)O3 (BLNT, x ≥0.3), (Bi1−xNdx)(Ni0.5Ti0.5)O3 (BNNT, x 0.4), and (Bi1−xSmx)(Ni0.5Ti0.5)O3 (BSNT, x≥0.6) films were confirmed to have been grown heteroepitaxially and to have had a single-phase perovskite structure. It is shown that of the three, the La-substituted BLNT (x = 0.5) film exhibits the best hysteresis loop shape with a remanent polarization of 12 μC/cm2. The formation mechanism of the perovskite structure, the structural properties, and the ferroelectric properties of bismuth lanthanoid nickel titanate (Bi1−xLnx)(Ni0.5Ti0.5)O3 (BLNT, Ln:La, Nd, or Sm, x = 0 − 0.9) thin films deposited on Pt(100)/MgO(100) substrates by sputtering have been investigated using X-ray diffraction and transmission electron microscopy. The present (Bi1−xLax)(Ni0.5Ti0.5)O3 (BLNT, x ≥0.3), (Bi1−xNdx)(Ni0.5Ti0.5)O3 (BNNT, x 0.4), and (Bi1−xSmx)(Ni0.5Ti0.5)O3 (BSNT, x≥0.6) films were confirmed to have been grown heteroepitaxially and to have had a single-phase perovskite structure. It is shown that of the three, the La-substituted BLNT (x = 0.5) film exhibits the best hysteresis loop shape with a remanent polarization of 12 μC/cm2.
Akihiro Tamura,Masafumi Kobune,Kazuki Imagawa,Hisashi Oshima,Yusuke Daiko,Atsushi Mineshige,Tetsuo Yazawa,Hiroshi Nishioka,Hironori Fujisawa,Masaru Shimizu,Hideshi Yamaguchi,Koichiro Honda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
3.0-mm-thick a- and b-axis-oriented (Bi_(3.25)Nd_(0.75))Ti_3O_(12) (BNT-0.75) films were fabricated on conductive Nb:TiO_2(101) (Nb = 0, 0.048, 0.46, 0.79 mass%) single crystal substrates by high-temperature sputtering. A BNT films grown on undoped TiO_2 substrates have no orientation, whereas BNT films deposited on Nb:TiO_2 substrates with 0.46-0.79 mass% Nb show strong (h00/0k0) diffractions and grow with a heteroepitaxial relationship to the underlying Nb:TiO_2 substrates. The BNT-0.75 film deposited on Nb:TiO_2(101) substrate with 0.79 mass% Nb was indicated the peculiar shape of approximately 100-150-nm-thick nanoplates. We speculate that the driving force for producing a plate-like structure for BNT films is attributed to the large anisotropy of linear expansion coefficients for Bi_4Ti_3O12, and the comparatively small lattice matching between Nb:TiO_2 substrate and BNT film.
Groin lymph node detection and sentinel lymph node biopsy in vulvar cancer
Chieko Sakae,Ken Yamaguchi,Noriomi Matsumura,Hidekatsu Nakai,Yumiko Yoshioka,Eiji Kondoh,Junzo Hamanishi,Kaoru Abiko,Masafumi Koshiyama,Tsukasa Baba,Aki Kido,Masaki Mandai,Ikuo Konishi 대한부인종양학회 2016 Journal of Gynecologic Oncology Vol.27 No.6
Objective: To identify suitable diagnostic tools and evaluate the efficacy of sentinel lymphnode (SLN) biopsy for inguinal lymph node metastasis in vulvar cancer. Methods: Data from 41 patients with vulvar cancer were evaluated retrospectively, includingmagnetic resonance imaging (MRI) measurements, SLN biopsy status, groin lymph nodemetastasis, and prognosis. Results: SLN biopsy was conducted in 12 patients who had stage I to III disease. Groinlymphadenectomy was omitted in five of the nine patients with negative SLNs. All SLNnegativepatients who did not undergo groin lymphadenectomy showed no evidence ofdisease after treatment. On MRI, the long and short diameters of the inguinal node weresignificantly longer in metastasis-positive cases, compared with negative cases, in 25 patientswhose nodes were evaluated pathologically (long diameter, 12.8 mm vs. 8.8 mm, p=0.025;short diameter, 9.2 mm vs. 6.7 mm, p=0.041). The threshold of >10.0 mm for the longaxis gave a sensitivity, specificity, positive predictive value, and negative predictive value of87.5%, 70.6%, 58.3%, and 92.3%, respectively, using a binary classification test. Decisiontree analysis revealed a sensitivity, specificity, and accuracy of 87.5%, 70.6%, and 76.0%,respectively, with the threshold of >10.0 mm for the long axis on MRI. The criteria of >10.0mm for the long axis on MRI predicted an advanced stage and poorer prognosis using avalidation set of 15 cases (p=0.028). Conclusion: Minimally invasive surgery after preoperative evaluation on MRI and SLN biopsyis a feasible strategy for patients with vulvar cancer.