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

Daniel Zuo, Runyu Liu, Daniel Wasserman, James Mabon, Zhao Yu He, Shi Liu, Yong-Hang Zhang, Emil A. Kadlec, Benjamin V. Olson, Eric A. Shaner

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


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.

Original languageEnglish (US)
Article number071107
JournalApplied Physics Letters
Issue number7
StatePublished - Feb 16 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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