Design of spectral crosstalk suppressing structure in two-color HgCdTe infrared focal plane arrays detector

Abstract

Spectral crosstalk suppressing design of two-color HgCdTe medium-wave/long-wave (MW/LW)n+-p1-P2-P3-N+ infrared focal plane arrays (IRFPAs) detector functioning in simultaneous mode is carried out in this study, using Crosslight Technology Computer Aided Design (TCAD) software. A compositional barrier of P1-region sandwiched between LW absorption layer of P2-region and MW absorption layer of P3-region is designed to suppress spectral crosstalk. MW-to-LW crosstalk can be significantly suppressed to 2.1% while LW-to-MW crosstalk can be maintained less than 1% by integrating an optimized compositional barrier.