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0.1-μm high performance double heterojunction In 0.32 Al 0.68 As/In 0.33 Ga 0.67 As metamorphic HEMTs on GaAs

Solid-State Electronics, ISSN: 0038-1101, Vol: 44, Issue: 9, Page: 1685-1688
2000
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High performance In 0.32 Al 0.68 As/In 0.33 Ga 0.67 As double heterojunction metamorphic high electron mobility transistors (DH-MMHEMT) have been grown by molecular beam epitaxy on GaAs substrates. An inverse step metamorphic buffer has been used to reach a relaxation rate close to 98% and a mean cross hatch of 2 nm. The DH-MMHEMT structure with a gate length of 0.1 μm exhibits a peak transconductance of 750 mS mm −1, a current density of 900 mA mm −1, a current gain cutoff frequency F t of 150 GHz and a maximum oscillation frequency F max of 250 GHz. These results clearly demonstrate the good electron transport properties of a double heterointerface structure due to the high relaxation, the good filtering of dislocations and the good control of the inverted InGaAs/InAlAs interface.

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