Simulation and design consideration of photoresponse for HgCdTe infrared photodiodes

We report on 2D numerical simulations of photo-response characteristic for long-wavelength HgCdTe infrared photodiodes. Effects of thickness of absorption layer on the photoresponse have been investigated. Optimal thickness of absorption layers at different absorption length and diffusion length are extracted numerically. An empirical formula is proposed to predict reasonable optimal thickness of absorption layer by theoretically analyzing its correlations with absorption length and diffusion length.