Two-dimensional DC and small-signal analysis of gate-to-source scaling effects in SiC-based high-power field-effect transistors have been performed in this paper. The simulation results show that a downscaling of gate...Two-dimensional DC and small-signal analysis of gate-to-source scaling effects in SiC-based high-power field-effect transistors have been performed in this paper. The simulation results show that a downscaling of gate-to-source distance can improve device performance, i.e. enhancing drain current, transconductance, and maximum oscillation frequency. This is associated with the peculiar dynamic of electrons in SiC MESFETs, which lead to a linear velocity regime in the source access region. The variations of gate-to-source capacitance, gate-to-drain capacitance, and cut-off frequency with respect to the change in gate-to-source length have also been studied in detail.展开更多
SiC MESFET器件的性能强烈依赖于栅肖特基结的特性,而栅肖特基接触的稳定性直接影响其可靠性。针对SiC MESFET器件在微波频率的应用中射频过驱动导致高栅电流密度的现象,设计了两种栅极大电流的条件,观察栅肖特基接触和器件特性的变化,...SiC MESFET器件的性能强烈依赖于栅肖特基结的特性,而栅肖特基接触的稳定性直接影响其可靠性。针对SiC MESFET器件在微波频率的应用中射频过驱动导致高栅电流密度的现象,设计了两种栅极大电流的条件,观察栅肖特基接触和器件特性的变化,并通过对试验数据的分析,确定了栅的寄生并联电阻的缓慢退化是导致栅肖特基结和器件特性退化,甚至器件烧毁失效的主要原因。展开更多
SiC是一种在高功率和高温应用中涌现的非常重要的半导体材料。研究了一种国产SiC MESFET器件在300℃温度应力下,存储1 000 h Ti/Pt/Au栅肖特基势垒接触的稳定性以及器件电学特性的变化。实验结果表明在300℃温度应力下,器件的最大饱和...SiC是一种在高功率和高温应用中涌现的非常重要的半导体材料。研究了一种国产SiC MESFET器件在300℃温度应力下,存储1 000 h Ti/Pt/Au栅肖特基势垒接触的稳定性以及器件电学特性的变化。实验结果表明在300℃温度应力下,器件的最大饱和漏电流、势垒高度、阈值电压和跨导等参数均呈现明显的下降趋势,在实验前期一段时间内退化较快,而在应力后期某段时间内为渐变并趋于稳定。展开更多
基金This work was supported by the Major State Basic Research Development Program of China, under Contract 51327010101.
文摘Two-dimensional DC and small-signal analysis of gate-to-source scaling effects in SiC-based high-power field-effect transistors have been performed in this paper. The simulation results show that a downscaling of gate-to-source distance can improve device performance, i.e. enhancing drain current, transconductance, and maximum oscillation frequency. This is associated with the peculiar dynamic of electrons in SiC MESFETs, which lead to a linear velocity regime in the source access region. The variations of gate-to-source capacitance, gate-to-drain capacitance, and cut-off frequency with respect to the change in gate-to-source length have also been studied in detail.
文摘SiC是一种在高功率和高温应用中涌现的非常重要的半导体材料。研究了一种国产SiC MESFET器件在300℃温度应力下,存储1 000 h Ti/Pt/Au栅肖特基势垒接触的稳定性以及器件电学特性的变化。实验结果表明在300℃温度应力下,器件的最大饱和漏电流、势垒高度、阈值电压和跨导等参数均呈现明显的下降趋势,在实验前期一段时间内退化较快,而在应力后期某段时间内为渐变并趋于稳定。
