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2 2013

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High-operating temperature MWIR nBn HgCdTe detector grown by MOCVD

Kopytko M., Kębłowski A., Gawron W., Madejczyk P., Kowalewski A, Jóźwikowski K

Opto-Electronics Review

2013

Vol. 21, No. 4

402-405

The paper reports on the first experimental results of the mid-wave infrared (MWIR) HgCdTe barrier detectors operated at near-room temperatures and fabricated using metal organic chemical vapor deposition (MOCVD). SIMS profiles let to compare projected and obtained structures and reveals interdiffusion processes between the layers. Undesirable iodine diffusion from cap to the barrier increase the valance band offset and is the key item in limiting the performance of HgCdTe nBn detector. However, MOCVD technology with a wide range of composition and donor/acceptor doping and without post grown annealing might be successfully adopted for barrier device architectures.

Modeling of HgCdTeLWIR detector for high operation temperature conditions

Martyniuk P., Gawron W., Madejczyk P., Rogalski A., Piotrowski J.

Metrology and Measurement Systems

2013

Vol. 20, nr 2

159--170

The paper reports on the photoelectrical performance of the long wavelength infrared (LWIR) HgCdTe high operating temperature (HOT) detector. The detector structure was simulated with commercially available software APSYS by Crosslight Inc. taking into account SRH, Auger and tunnelling currents. A detailed analysis of the detector performance such as dark current, detectivity, time response as a function of device architecture and applied bias is performed, pointing out optimal working conditions.