In P基HEMT器件制作中,栅槽刻蚀工艺是形成良好的肖特基接触栅的关键工艺。针对这一问题,研究了用丁二酸和H_2O_2混合液作为In P基HEMT器件栅槽腐蚀液,确定栅槽完全腐蚀并获得较好的表面平整度的最优时间。首先用单片In Ga As和单片In A...In P基HEMT器件制作中,栅槽刻蚀工艺是形成良好的肖特基接触栅的关键工艺。针对这一问题,研究了用丁二酸和H_2O_2混合液作为In P基HEMT器件栅槽腐蚀液,确定栅槽完全腐蚀并获得较好的表面平整度的最优时间。首先用单片In Ga As和单片In Al As材料进行单步腐蚀,最终得到腐蚀液对这两种材料的腐蚀速度;其次对In P基HEMT器件外延材料进行光刻,对光刻后图形进行20 s,40 s,60 s的腐蚀。同时采用光学显微镜观察腐蚀图形,利用电流监控法确定腐蚀形成HEMT器件的栅槽腐蚀时间,并通过原子力显微镜(AFM)进行表面平整度观察,最终得到60 s的腐蚀时间的特性较好,进而确定为栅槽形成的最优腐蚀时间是60 s。展开更多
Monolithic integration of resonant tunneling diodes (RTDs) and high electron mobility transistors (HEMTs) is an important development direction of ultra-high speed integrated circuit. A kind of top-RTD and bottom-HEMT...Monolithic integration of resonant tunneling diodes (RTDs) and high electron mobility transistors (HEMTs) is an important development direction of ultra-high speed integrated circuit. A kind of top-RTD and bottom-HEMT material structure is epitaxied on InP substrate through molecular beam epitaxy. Based on wet chemical etching, metal lift-off and air bridge interconnection technology, RTD and HEMT are fabricated simultaneously. The peak-to-valley current ratio of RTD is 7.7 and the peak voltage is 0.33 V at room temperature. The pinch-off voltage is -0.5 V and the current gain cut-frequency is 30 GHz for a 1.0 μm gate length depletion mode HEMT. The two devices are conformable in current magnitude, which is suitable for the construction of various RTD/HEMT monolithic integration logic circuits.展开更多
基金Supported by National Natural Science Foundation of China (No. 60876009)Tianjin Research Program of Application Foundation and Advanced Technology (No. 09JCZDJC16600)
文摘Monolithic integration of resonant tunneling diodes (RTDs) and high electron mobility transistors (HEMTs) is an important development direction of ultra-high speed integrated circuit. A kind of top-RTD and bottom-HEMT material structure is epitaxied on InP substrate through molecular beam epitaxy. Based on wet chemical etching, metal lift-off and air bridge interconnection technology, RTD and HEMT are fabricated simultaneously. The peak-to-valley current ratio of RTD is 7.7 and the peak voltage is 0.33 V at room temperature. The pinch-off voltage is -0.5 V and the current gain cut-frequency is 30 GHz for a 1.0 μm gate length depletion mode HEMT. The two devices are conformable in current magnitude, which is suitable for the construction of various RTD/HEMT monolithic integration logic circuits.
