Based on the surface-gate and buried-gate structures,a novel buried-gate structure called the planar type buried-gate (PTBG) structure for static induction devices (SIDs) is proposed.An approach to realize a buried-ga...Based on the surface-gate and buried-gate structures,a novel buried-gate structure called the planar type buried-gate (PTBG) structure for static induction devices (SIDs) is proposed.An approach to realize a buried-gate type static induction transistor by conventional planar process technology is presented.Using this structure,it is successfully avoided the second epitaxy with a high degree of difficulty and the complicated mesa process in conventional buried gate.The experimental results demonstrate that this structure is desirable for application in power SIDs.Its advantages are high breakdown voltage and blocking gain.展开更多
By using transfer matrix,the lower-order natural frequencies of the Watt type planar six-barlinkage are calculated in this paper.The experiment of the modal analysis is done with the SignalProcessor 7T17S,and the expe...By using transfer matrix,the lower-order natural frequencies of the Watt type planar six-barlinkage are calculated in this paper.The experiment of the modal analysis is done with the SignalProcessor 7T17S,and the experiment results agree with the calculated ones.This method only re-quires calculation of lower-order transfer matrix and determinant values,so that, it can be done ona minicomputer such as IBM/PC.The method adopted in this paper is also suitable for vibrationanalysis of other types of linkages.展开更多
Among many strategies to develop high-performance perovskite solar cells,interface engineering is considered as a promising approach for achieving high power conversion efficiency.Specifically,high optical transparenc...Among many strategies to develop high-performance perovskite solar cells,interface engineering is considered as a promising approach for achieving high power conversion efficiency.Specifically,high optical transparency and excellent electrical properties are essential for optimized hole transport materials in inverted-type planar perovskite solar cells.In this study,we demonstrate that the molecular doping of copper thiocyanate(CuSCN)by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)significantly enhances the photovoltaic performance of perovskite solar cells.The incorporation of F4TCNQ into CuSCN leads to successful electron transfer from CuSCN to F4TCNQ,which affords more balanced energy level alignment at the interface of the perovskite layer for hole conduction.Device analyses reveal faster charge transport and less carrier recombination in the F4TCNQ-doped CuSCN-based devices,contributing to not only the improved efficiency but also the hysteresis elimination.At the optimized doping concentration,the doped CuSCN exhibited an∼35%increased efficiency as high as 15.01%in the inverted-type planar perovskite solar cells.展开更多
The paper introduces a microreactor with high thermal insulation properties,which has been developed forintegration with standard planar-type solid oxide fuel cells(SOFCs)in portable power generation applications.Whil...The paper introduces a microreactor with high thermal insulation properties,which has been developed forintegration with standard planar-type solid oxide fuel cells(SOFCs)in portable power generation applications.Whileplanar SOFCs offer high efficiency and energy density,their use has been largely limited to stationary applications dueto challenges in thermal management and slow start-up times.Our microreactor overcomes these barriers byproviding an effective thermal insulation system,allowing SOFCs to operate efficiently in a compact,portable format.We designed a cantilevered structure using yttria-stabilized zirconia(YSZ)to minimize thermal conduction andcombined it with a multilayer insulation(MLI)system to suppress thermal radiation loss.This flexible cantileveredstructure prevents cracking under thermal stress and maintains high temperatures up to 700℃,ensuring reliableoperation.Additionally,the MLI system features an inherent safety mechanism:when the insulation structure isdamaged by a drill,the loss of thermal insulation causes a rapid temperature drop,bringing the system below thehydrogen explosion threshold temperature within 5 minutes,thus preventing potential hazards.Our prototypesuccessfully demonstrated handheld power generation using a button-type metal-supported SOFC,achieving a rapidstart-up time of just 5 minutes and driving a motor.This breakthrough offers a new platform for miniaturized SOFCtechnology,bridging the gap between stationary and portable energy solutions.展开更多
对平面梯形结构多间隙谐振腔的模式分布、特性阻抗、耦合系数以及工作稳定性进行了研究.在此基础上给出了W波段高峰值功率扩展互作用速调管高频互作用系统设计,并采用三维粒子模拟(PIC)技术对电子的速度调制、群聚及其与高频场的相互作...对平面梯形结构多间隙谐振腔的模式分布、特性阻抗、耦合系数以及工作稳定性进行了研究.在此基础上给出了W波段高峰值功率扩展互作用速调管高频互作用系统设计,并采用三维粒子模拟(PIC)技术对电子的速度调制、群聚及其与高频场的相互作用和能量转换等物理过程进行了研究,定量给出了放大器的功率、带宽、效率以及增益等关键技术指标.PIC结果显示:在中心频率94.52 GHz以及电压16 k V、电流0.6 A的电子注参数下,最大输出功率达到1.8 k W,相应的增益和电子效率分别为47.7 d B和19.4%;扫频结果显示瞬时3 d B带宽为210 MHz.展开更多
文摘Based on the surface-gate and buried-gate structures,a novel buried-gate structure called the planar type buried-gate (PTBG) structure for static induction devices (SIDs) is proposed.An approach to realize a buried-gate type static induction transistor by conventional planar process technology is presented.Using this structure,it is successfully avoided the second epitaxy with a high degree of difficulty and the complicated mesa process in conventional buried gate.The experimental results demonstrate that this structure is desirable for application in power SIDs.Its advantages are high breakdown voltage and blocking gain.
文摘By using transfer matrix,the lower-order natural frequencies of the Watt type planar six-barlinkage are calculated in this paper.The experiment of the modal analysis is done with the SignalProcessor 7T17S,and the experiment results agree with the calculated ones.This method only re-quires calculation of lower-order transfer matrix and determinant values,so that, it can be done ona minicomputer such as IBM/PC.The method adopted in this paper is also suitable for vibrationanalysis of other types of linkages.
基金supported by Korea Electric Power Corporation(Grant number:R17XA05-11)This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT&Future Planning(Grant number:2017R1C1B2009691).
文摘Among many strategies to develop high-performance perovskite solar cells,interface engineering is considered as a promising approach for achieving high power conversion efficiency.Specifically,high optical transparency and excellent electrical properties are essential for optimized hole transport materials in inverted-type planar perovskite solar cells.In this study,we demonstrate that the molecular doping of copper thiocyanate(CuSCN)by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)significantly enhances the photovoltaic performance of perovskite solar cells.The incorporation of F4TCNQ into CuSCN leads to successful electron transfer from CuSCN to F4TCNQ,which affords more balanced energy level alignment at the interface of the perovskite layer for hole conduction.Device analyses reveal faster charge transport and less carrier recombination in the F4TCNQ-doped CuSCN-based devices,contributing to not only the improved efficiency but also the hysteresis elimination.At the optimized doping concentration,the doped CuSCN exhibited an∼35%increased efficiency as high as 15.01%in the inverted-type planar perovskite solar cells.
基金supported by the following funding sources:JSPS KAKENHI Grant-in-Aid for Scientific Research(B),Grant Numbers 23K26749 and 23K21047the NEDO Project for the Promotion of Young Researchers in Industry-Academia-Government Collaboration+1 种基金and the ERCA Innovative Research and Development Program(Young Researcher Category)supported by joint research funds from Futaba Industrial Co.,Ltd.and TAIYO YUDEN Co.,Ltd.
文摘The paper introduces a microreactor with high thermal insulation properties,which has been developed forintegration with standard planar-type solid oxide fuel cells(SOFCs)in portable power generation applications.Whileplanar SOFCs offer high efficiency and energy density,their use has been largely limited to stationary applications dueto challenges in thermal management and slow start-up times.Our microreactor overcomes these barriers byproviding an effective thermal insulation system,allowing SOFCs to operate efficiently in a compact,portable format.We designed a cantilevered structure using yttria-stabilized zirconia(YSZ)to minimize thermal conduction andcombined it with a multilayer insulation(MLI)system to suppress thermal radiation loss.This flexible cantileveredstructure prevents cracking under thermal stress and maintains high temperatures up to 700℃,ensuring reliableoperation.Additionally,the MLI system features an inherent safety mechanism:when the insulation structure isdamaged by a drill,the loss of thermal insulation causes a rapid temperature drop,bringing the system below thehydrogen explosion threshold temperature within 5 minutes,thus preventing potential hazards.Our prototypesuccessfully demonstrated handheld power generation using a button-type metal-supported SOFC,achieving a rapidstart-up time of just 5 minutes and driving a motor.This breakthrough offers a new platform for miniaturized SOFCtechnology,bridging the gap between stationary and portable energy solutions.
文摘对平面梯形结构多间隙谐振腔的模式分布、特性阻抗、耦合系数以及工作稳定性进行了研究.在此基础上给出了W波段高峰值功率扩展互作用速调管高频互作用系统设计,并采用三维粒子模拟(PIC)技术对电子的速度调制、群聚及其与高频场的相互作用和能量转换等物理过程进行了研究,定量给出了放大器的功率、带宽、效率以及增益等关键技术指标.PIC结果显示:在中心频率94.52 GHz以及电压16 k V、电流0.6 A的电子注参数下,最大输出功率达到1.8 k W,相应的增益和电子效率分别为47.7 d B和19.4%;扫频结果显示瞬时3 d B带宽为210 MHz.
