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We investigated 60-nm In0.52Al0.48As/In0.53Ga0.47As pseudomorphic high-electron mobility transistors (p-HEMTs) fabricated by using a Ne-based atomic-layer-etching (ALET) technology. The ALET process produced a reproducible etch rate of 1.47 Aring/cycle for an InP etch stop layer, an excellent InP etch selectivity of 70 against an In0.52Al0.48As barrier layer, and an rms surface-roughness value of...
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