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The relatively low Schottky barrier height on In0.52Al0.48As lattice-matched to InP has hampered the achievement of enhancement-mode InA1As/InGaAs/InP high electron mobility transistors (E-HEMTs). By introducing latticemismatched strained aluminum-rich In0.45 Al0.55As as the Schottky contact material to enhance the barrier height,we have developed InP-based InAlAs/InGaAs/InP E-HEMT with threshold voltage of about 150 m V. A maximum extrinsic transconductance of 660mS/mm and output conductance of 15mS/mm are measured for 1μm-gatelength devices at room temperature. The devices also show excellent radio-frequency performance with cutoff frequency of 50 GHz and maximum oscillation frequency of 54 GHz.