Abstract

This paper demonstrates a low damage inductively coupled plasma SF6/C4F8 dry etch process for the realisation of nanoscale molybdenum gate lines. The optimised process is capable of defining 30nm lines in 100nm thick molybdenum films, with no observable degradation of the mobility of an InGaAs/InAlAs high electron mobility transistor structure which was subjected to the etch. These characteristics make the process reported here suitable for the realisation of short gate length, high performance III–V compound semiconductor transistors.

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