Peak current densities (I-p) as high as 1.3 x 10(5) A/cm(2) with peak-
to-valley current ratios of 3.7 are reported for InAs/AlSb/GaSb/AlSb/I
nAs double-barrier resonant interband tunnelling diodes. The fact that
1-monolayer-thick AlSb barriers exist between the InAs and GaSb layer
s is essential in obtaining such a high value of I-p.