High-Operating-Temperature MWIR Detector Diodes

The high-operating-temperature (HOT) midwave infrared (MWIR) n-on-p detector has been pursued using the high-density vertically integrated photodiode (HDVIP^®) architecture. In this device, arsenic-doped HgCdTe grown by liquid-phase epitaxy (LPE) is used, passivated on both surfaces with interdiffused CdTe. Dark current densities on these diodes as low as 2.5 mA/cm² normalized to a 5 μm cutoff at 250 K have been demonstrated. 1/f noise at 1 Hz, measured at 250 K, is found to be 6 × 10^?11 A/rHz-cm measured on a cutoff of 4.43 μm. These results agree with the theoretical predictions for the devices made.