A thick SOI LIGBT structure with a combination of uniform and variation in lateral doping profiles （UVLD） on partial membrane （UVLD PM LIGBT） is proposed. The silicon substrate under the drift region is selectivel...A thick SOI LIGBT structure with a combination of uniform and variation in lateral doping profiles （UVLD） on partial membrane （UVLD PM LIGBT） is proposed. The silicon substrate under the drift region is selectively etched to remove the charge beneath the buried oxide so that the potential lines can release below the membrane, resulting in an enhanced breakdown voltage. Moreover, the thick SOI LIGBT with the advantage of a large current flowing and a thermal diffusing area achieves a strong current carrying capability and a low junction temperature. The current carrying capability （VAnode = 6 V, VGate = 15 V） increases by 16% and the maximal junction temperature （1 mW/μm） decreases by 30 K in comparison with that of a conventional thin SO1 structure.展开更多
Nanostructured zeolitic imidazolate frameworks(ZIF-8) was incorporated into the mixture of poly(ethylene glycol) methyl ether acrylate(PEGMEA) and pentaerythritol triacrylate(PETA) to synthesize mixed matrix membranes...Nanostructured zeolitic imidazolate frameworks(ZIF-8) was incorporated into the mixture of poly(ethylene glycol) methyl ether acrylate(PEGMEA) and pentaerythritol triacrylate(PETA) to synthesize mixed matrix membranes(MMMs) by in situ polymerization for CO_2/CH_4 separation. The solvent-free polymerization between PEGMEA and PETA was induced by UV light with 1-hydroxylcyclohexyl phenyl ketone as initiator. The chemical structural characterization was performed by Fourier transform infrared spectroscopy. The morphology was characterized by scanning electron microscope. The average chain-to-chain distance of the polymer chains in MMMs was investigated by X-ray diffraction. The thermal property was evaluated by differential scanning calorimetry. The CH_4 and CO_2 gas transport properties of MMMs are reported. The relationship between gas permeation–separation performances or physical properties and ZIF-8 loading is also discussed. However, the permeation–separation performance was not improved in Robeson upper bound plot compared with original polymer membrane as predicted. The significant partial pore blockage and polymer rigidification effect around the ZIFs confirmed by the increase in glass temperature and the decrease in the d-spacing, were mainly responsible for the failure in performance improvement, which offset the high diffusion induced by porous ZIF-8.展开更多
基金Project supported by the National Natural Science Foundation of China(No.60906038)the Science-Technology Foundation for Young Scientist of University of Electronic Science and Technology of China(No.L08010301JX0831)
文摘A thick SOI LIGBT structure with a combination of uniform and variation in lateral doping profiles （UVLD） on partial membrane （UVLD PM LIGBT） is proposed. The silicon substrate under the drift region is selectively etched to remove the charge beneath the buried oxide so that the potential lines can release below the membrane, resulting in an enhanced breakdown voltage. Moreover, the thick SOI LIGBT with the advantage of a large current flowing and a thermal diffusing area achieves a strong current carrying capability and a low junction temperature. The current carrying capability （VAnode = 6 V, VGate = 15 V） increases by 16% and the maximal junction temperature （1 mW/μm） decreases by 30 K in comparison with that of a conventional thin SO1 structure.
基金Supported by the National Natural Science Foundation of China(21776217,21506160)Tianjin Research Program of Application Foundation and Advanced Technology(14JCQNJC06400)+1 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars(48)the Science and Technology Plans of Tianjin(16PTSYJC00110)
文摘Nanostructured zeolitic imidazolate frameworks(ZIF-8) was incorporated into the mixture of poly(ethylene glycol) methyl ether acrylate(PEGMEA) and pentaerythritol triacrylate(PETA) to synthesize mixed matrix membranes(MMMs) by in situ polymerization for CO_2/CH_4 separation. The solvent-free polymerization between PEGMEA and PETA was induced by UV light with 1-hydroxylcyclohexyl phenyl ketone as initiator. The chemical structural characterization was performed by Fourier transform infrared spectroscopy. The morphology was characterized by scanning electron microscope. The average chain-to-chain distance of the polymer chains in MMMs was investigated by X-ray diffraction. The thermal property was evaluated by differential scanning calorimetry. The CH_4 and CO_2 gas transport properties of MMMs are reported. The relationship between gas permeation–separation performances or physical properties and ZIF-8 loading is also discussed. However, the permeation–separation performance was not improved in Robeson upper bound plot compared with original polymer membrane as predicted. The significant partial pore blockage and polymer rigidification effect around the ZIFs confirmed by the increase in glass temperature and the decrease in the d-spacing, were mainly responsible for the failure in performance improvement, which offset the high diffusion induced by porous ZIF-8.
