Self-aligned In0.49Ga0.51P/GaAs HBT DC and RF characteristics related with orientations
A self-aligned InGaP/GaAs HBT DC and RF characteristics related with orientations were studied. The DC current gain was greater for the [0 1 1] emitter orientation compared to orientation. However, it also showed slightly better RF performance for orientation with a cutoff frequency fT 69GHz compared to the fT of 62GHz for the [0 1 1] orientation. This experimental work has been proposed that the dependence of the characteristics could be attributed to both piezoelectric effect and the difference between lateral etched profiles in different directions.
dc current gain cutoff frequency lateral etched profile ingap/gaas hbt orientation effects