Publications

Direct minority carrier transport characterization of InAs/InAsSb superlattice nBn photodetectors

Zuo, Daniel; Liu, Runyu; Wasserman, Daniel; Mabon, James; He, Zhao Y.; Liu, Shi; Zhang, Yong H.; Kadlec, Emil A.; Olson, Benjamin V.; Shaner, Eric A.

We present an extensive characterization of the minority carrier transport properties in an nBn mid-wave infrared detector incorporating a Ga-free InAs/InAsSb type-II superlattice as the absorbing region. Using a modified electron beam induced current technique in conjunction with time-resolved photoluminescence, we were able to determine several important transport parameters of the absorber region in the device, which uses a barrier layer to reduce dark current. For a device at liquid He temperatures, we report a minority carrier diffusion length of 750 nm and a minority carrier lifetime of 200 ns, with a vertical diffusivity of 3 × 10-2 cm2/s. We also report on the device's optical response characteristics at 78 K.