Deep level studies of Hg1−xCdxTe. II: Correlation with photodiode performance

Abstract
Trapping parameters measured by deep level transient spectroscopy (DLTS) for several samples of Hg1−xCdxTe doped p type by mercury vacancies have been correlated with photodiode characteristics. The samples are Hg1−xCdxTe with x values of 0.215, 0.305, and 0.320. The DLTS measured parameters are trap energy, concentration, and electron and hole capture cross sections. These parameters are used to calculate minority carrier lifetime and generation-recombination noise current. DLTS has identified Shockley-Read recombination centers which determines the carrier lifetime of p-type Hg1−xCdxTe photodiodes and the resistance-area product detectivity figure of merit.