Role of grooving angle of 14‐nm‐InAs channel quantum well MOSFETs in improving analogue/RF and linearity performance

The authors investigate and physically analyse the effects of the angle of grooving ( θ ) on various analogues and RF parameters of InAs‐channel quantum well MOSFETs with raised source/drain architecture at a 14‐nm gate length. Moreover, harmonic distortion analysis is performed to examine the linearity and distortion of common source amplifiers built with such transistors. The findings reveal that the device with θ  = 20° exhibits significant improvement in transconductance efficiency ( g m /I DS ), output resistance ( r d ), and voltage gain ( A v ) while showing degradation in transconductance ( g m ) compared to the corresponding parameter with θ  = 90°. Furthermore, the obtained results manifest that the total harmonic distortion drops to −47 dB for an amplifier built with the device having θ  = 90° compared to −22 dB obtained with θ  = 20°. Notably, as the angle of grooving increases from 20° to 90°, the gain bandwidth of the amplifier improves by 232% while the peak gain falls by 40%.