Design and Modeling of HgCdTe nBn Detectors |
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Authors: | A M Itsuno J D Phillips S Velicu |
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Affiliation: | (1) SELEX Sensors and Airborne Systems Infrared Ltd., SO15 OEG Southampton, Hampshire, UK |
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Abstract: | An n-type mercury cadmium telluride (HgCdTe) unipolar nBn infrared detector structure is proposed as a means of achieving performance
limited by intrinsic thermal carrier generation without requirements for p-type doping. Numerical modeling was utilized to calculate the current–voltage and optical response characteristics and detectivity
values for HgCdTe nBn and p–n junction devices with a cut-off wavelength of 12 μm for temperatures between 50 K and 300 K. Calculations demonstrate similar dark current density, responsivity, and detectivity
values within 10% for the long-wavelength infrared (LWIR) nBn detector compared with the p–n junction structure for temperatures from 50 K to 95 K. These results show that the HgCdTe nBn device may be a promising alternative
for achieving high performance using a simplified device structure while circumventing issues related to p-type doping in current p–n junction technology such as achieving low, controllable doping concentrations, and serving as a basis for next-generation
device structures. |
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