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Effects of a Recessed Camel-gate Head Structure on Normally-off AlGaN/GaN HEMTs
Mansoor Ali Khan,허준우,김영진,박현창,박형무,김현석,문재경 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.5
In this paper, a standalone camel-gate (┐) head structure has been studied to investigate the effects of the field plate (FP) in the source access region in AlGaN/GaN high electron mobility transistors (HEMTs). The camel gate serves as an FP toward the source side. Using this concept of the camel gate, the transconductance and other forward characteristics have been analyzed with regard to the T-gate. It is confirmed that the recessed camel-gate FP scaling enhances the breakdown voltage, transconductance, and output current by reducing the electric field, leakage current, and dispersion in the source access regime. Further, the optimized recessed camel-gate AlGaN/GaN HEMT is suitable for use in RF devices, as it exhibits a frequency in the order of gigahertz.
Zn-modified mesoporous Al<sub>2</sub>O<sub>3</sub> for CO<sub>2</sub> hydrogenation to methanol
( Mansoor Ali ),배종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
For the reduction of atmospheric CO<sub>2</sub> emission, considerable achievements have been made in CO<sub>2</sub> hydrogenation to various chemicals such as alcohols, lower olefins and fuels. However, the synthesis of aromatics from one-pass CO<sub>2</sub> hydrogenation is still a great challenge owing to the extreme inertness of CO<sub>2</sub> and higher C-C coupling barrier. Therefore, the mesoporous Zn/Al<sub>2</sub>O<sub>3</sub> by varying Zn content was investigated for the CO<sub>2</sub> hydrogenation to methanol and dimethyl ether (DME). At a relatively higher temperature, ZnO and ZnAl<sub>2</sub>O<sub>4</sub> were active for CO<sub>2</sub> hydrogenation and Lewis acidic Al<sub>2</sub>O<sub>3</sub> sites were active for methanol dehydration to DME. Furthermore, Zn/Al<sub>2</sub>O<sub>3</sub> in combination with HZSM-5 was prepared to directly synthesize aromatics from oxygenates formed by CO<sub>2</sub> hydrogenation.
( Mansoor Ali ),배종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Fischer-Tropsch synthesis (FTS) reaction is a core technology for syngas conversion to long chain hydrocarbons which can produce the various clean fuels. A promising hybrid catalyst containing the ordered mesoporous FeZrOx bimetal oxides coated with Mo-modified Ferrierite (FER) was investigated for the direct conversion of syngas to C<sub>5+</sub> hydrocarbons. The combination of the FeZrOx binary metal oxides decorated with the solid acid Mo/FER revealed a higher selectivity to C<sub>5+</sub> hydrocarbons of 85% at ~ 51% CO conversion, which was found to be much higher than the pristine FeZrOx catalyst. The detailed surface properties of the hybrid catalyst were characterized by N<sub>2</sub> sorption XRD, SEM, XPS, H<sub>2</sub>-TPR and NH<sub>3</sub>-TPD.