Simulation on the degradation of 4H-SiC Schottky detector was carried out using ISE TCAD, and the limit of the driftdiffusion analytical model was discussed. Two independent defect levels, rather than a pair of specif...Simulation on the degradation of 4H-SiC Schottky detector was carried out using ISE TCAD, and the limit of the driftdiffusion analytical model was discussed. Two independent defect levels, rather than a pair of specific carrier lifetime, were induced to describe Z1/2 defects in simulation to calculate the charge collection efficiency versus bias voltage. Comparison between our calculation and the reported experimental results shows that an acceptable agreement was achieved, proving the feasibility of regarding Z1/2 defect as two individual defect levels. Such a treatment can simplify the simulation and may help to further investigate the detector degradation.展开更多
The strengthening mechanisms of hot-rolled steels micro alloyed with Ti （ST-TQS00） and Nh Ti （NT TQ500） were investigated by examining the microstructures of steels using optical microscope （OM）, scanning elec t...The strengthening mechanisms of hot-rolled steels micro alloyed with Ti （ST-TQS00） and Nh Ti （NT TQ500） were investigated by examining the microstructures of steels using optical microscope （OM）, scanning elec tron microscope （SEM） and transmission electron microscope （TEM）. The results revealed ahnost no differences in the solute solution strengthening and fine grained strengthcning of the two steels, whereas the contributions of pre cipitation strengthening and dislocation strengthening were different for ST-TQ500 and NT-TQ500. The measured precipitation strengthening effect of ST-TQ500 was 88 MPa higher than that of NT-TQ500： this difference was pri marily attributed to the stronger precipitation effect of thc Ti-containing nanoscale particles. The dislocation strengthening effect of ST TQ500 was approximately 80 MPa lower than that of NT-TQ500. This is tbought to be related to differences in deformation behavior during the finishing rolling stage; the inhibition of dynamic recrystallization from Nb in NT-TQ500 （Nb-Ti） may lead to higher density of dislocations in the microstructure.展开更多
基金Project supported by the National Key R&D Program of China(Grant No.2016YFB0400400)
文摘Simulation on the degradation of 4H-SiC Schottky detector was carried out using ISE TCAD, and the limit of the driftdiffusion analytical model was discussed. Two independent defect levels, rather than a pair of specific carrier lifetime, were induced to describe Z1/2 defects in simulation to calculate the charge collection efficiency versus bias voltage. Comparison between our calculation and the reported experimental results shows that an acceptable agreement was achieved, proving the feasibility of regarding Z1/2 defect as two individual defect levels. Such a treatment can simplify the simulation and may help to further investigate the detector degradation.
基金financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB30000000)the National Natural Science Foundation of China(52192600,11790291,61888102,61999102,52001220,and 51822107)+1 种基金the National Key Research and Development Plan(2018YFA0703603)the Natural Science Foundation of Guangdong Province(2019B030302010)。
基金Item Sponsored by National Natural Science Foundation of China(51374151)Foundation for Key Program of Shanxi Province of China(20111101053)Foundation for Major Coal Base New Materials Program of Shanxi Province of China(MC2014-02)
文摘The strengthening mechanisms of hot-rolled steels micro alloyed with Ti （ST-TQS00） and Nh Ti （NT TQ500） were investigated by examining the microstructures of steels using optical microscope （OM）, scanning elec tron microscope （SEM） and transmission electron microscope （TEM）. The results revealed ahnost no differences in the solute solution strengthening and fine grained strengthcning of the two steels, whereas the contributions of pre cipitation strengthening and dislocation strengthening were different for ST-TQ500 and NT-TQ500. The measured precipitation strengthening effect of ST-TQ500 was 88 MPa higher than that of NT-TQ500： this difference was pri marily attributed to the stronger precipitation effect of thc Ti-containing nanoscale particles. The dislocation strengthening effect of ST TQ500 was approximately 80 MPa lower than that of NT-TQ500. This is tbought to be related to differences in deformation behavior during the finishing rolling stage; the inhibition of dynamic recrystallization from Nb in NT-TQ500 （Nb-Ti） may lead to higher density of dislocations in the microstructure.
基金supported by the National Key Research and Development Plan(2018YFA0703603)Guangdong Major Project of Basic and Applied Basic Research,China(2019B030302010)+1 种基金the National Natural Science Foundation of China(51822107,11790291 and 61888102)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB30000000)。
