The InAs quantum well heterostructure was successfully grown on a semi-insu
lating GaAs substrate by MBE. On the GaAs substrate, the semi-insulating Al
GaAsSb was grown to a thickness of 600 nm as the buffer layer, followed by
a 15 nm InAs channel layer and a 35 nm AlGaAsSb doped layer together with 1
0 nm GaAsSb cap layer successively. The electron mobility and the sheet car
rier concentration of the 15 nm InAs heterostructure was about 1 m(2) V-1 s
(-1) and 4.5 x 10(12) cm(-2), respectively, at room temperature. This heter
ostructure is equivalent to the heavily doped InAs substrate with little ch
ange of the electron mobility on temperature. This device has typical 1/f n
oise characteristics without any large bulge throughout the frequency and t
he temperature ranges observed. The Hooge parameter was alpha (H) = 1 x 10(
-3) at room temperature, decreasing monotonically with the decreasing tempe
rature down to 5 x 10(-4) at 50 K, indicating characteristics of the virtua
lly constant mobility and constant carrier concentration device. (C) 2000 E
lsevier Science Ltd. All rights reserved.