Response time study in unbiased long wavelength HgCdTe detectors

Paweł Madejczyk; Waldemar Gawron; Artur Kębłowski; Piotr Martyniuk; Małgorzata Kopytko; Wioletta Pusz; Dawid Stępień; Jarosław Rutkowski; Adam Piotrowski; Józef Piotrowski; Antoni Rogalski

doi:10.1117/1.OE.56.8.087103

24 August 2017 Response time study in unbiased long wavelength HgCdTe detectors

Paweł Madejczyk, Waldemar Gawron, Artur Kębłowski, Piotr Martyniuk, Małgorzata Kopytko, Wioletta Pusz, Dawid Stępień, Jarosław Rutkowski, Adam Piotrowski, Józef Piotrowski, Antoni Rogalski

Author Affiliations +

Optical Engineering, Vol. 56, Issue 8, 087103 (August 2017). https://doi.org/10.1117/1.OE.56.8.087103

Abstract

Theoretical and experimental investigations on the response time improvement of unbiased long-wave infrared (LWIR) HgCdTe detectors operating at temperatures T=230 K were presented. Metal–organic chemical vapor deposition technology is an excellent tool in fabrication of different HgCdTe detector structures with a wide range of composition and donor/acceptor doping and without postgrown ex-situ annealing. The time constant is lower in biased detectors due to Auger-suppression phenomena and reduction of diffusion capacitance related to a wider depletion region. The relatively high bias current requirements and excessive low-frequency noise, which reduces the detectivity of biased detectors, inspire research on the time constant improvement of unbiased detectors. The response time of high-operating temperature LWIR HgCdTe detectors revealed complex behavior being dependent on the applied reverse bias, the operating temperature, the absorber thickness and doping, the series resistance, and the electrical area of the devices. The response time of 2 ns was achieved for unbiased 30×30 μm HgCdTe structures with λ50%=10.6 μm operating at T=230 K.

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Paweł Madejczyk, Waldemar Gawron, Artur Kębłowski, Piotr Martyniuk, Małgorzata Kopytko, Wioletta Pusz, Dawid Stępień, Jarosław Rutkowski, Adam Piotrowski, Józef Piotrowski, and Antoni Rogalski "Response time study in unbiased long wavelength HgCdTe detectors," Optical Engineering 56(8), 087103 (24 August 2017). https://doi.org/10.1117/1.OE.56.8.087103

Received: 15 May 2017; Accepted: 2 August 2017; Published: 24 August 2017

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