Generation-recombination (g-r) processes in the passivant/HgCdTe interface region are shown to complicate the transient photoconductive (PC) decays. Anomalous PC decays showing delayed peaks are observed and modeled for the first time. These peaks are correlated with the electron and hole traps in the interface region. Activation energy and density of the electron traps in the anodic oxide/n-Hg 0.78 Cd 0.22 Te interface region are estimated to be 12 meV and 1.1 × 10 10 cm -2 , respectively. Density of hole traps is estimated to be 2.4 × 10 10 cm -2 .