Resonant tunneling and multiple negative differential conductance features in long wavelength interband cascade infrared photodetectors

We report on an investigation of multiple negative differential conductance (NDC) features in long wavelength interband cascade infrared photodetectors (ICIPs) at and above 300 K. Using ICIPs with various structures and carrier concentrations, we employ several approaches to demonstrate that the observed multiple NDC features and their unusual temperature dependence are related to the sequential turn off of resonant tunneling of minority carriers through the electron barriers at high temperatures.