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A laterally scaled-down ohmic structure and an InGaAs/InAs composite channel improve the dc and RF characteristics of InP-based HEMTs. We reduced the distance between the gate and ohmic metal to less than 100 nm and to form sub-100-nm-long gate simultaneously, and also introduced device passivation for future construction of subterahertz-band integrated circuits. A 50-nm-gate HEMT exhibiting extrinsic...
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