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A study is presented of multi-carrier electronic transport parameters in HgCdTe films extracted through use of advanced mobility spectrum analysis techniques. It is shown that even in single layer long-wave infrared HgCdTe epitaxial films three well-defined electron species associated with the surface, bulk and substrate-interface regions can be accurately discriminated. Furthermore, it is also shown...
We report supporting evidence that is consistent with p- to n-type conversion of HgCdTe that is induced by surface indentation, as the progress towards the fabrication of photovoltaic infrared detectors by direct imprinting.
The semiconductor-passivating layer interfaces, as well as their dielectric properties, play important and very often dominant roles in determining HgCdTe device performance. In this work, photoconductors were fabricated on p-type mid-wave infrared Hg1-xCdxTe material using molecular beam epitaxy (MBE) grown CdTe film as the passivation layer. In order to emphasize the importance of the CdTe passivating...
The materials and processes for fabrication of monolithically integrated microelectromechanical systems-based microspectrometers operating in the short-wavelength IR range is presented. Using low-temperature surface micromachining techniques, compatible with a range of IR sensor technologies, silicon-nitride-based tunable Fabry-Perot filter structures with distributed Bragg mirrors made of Ge/SiO/Ge...
A HgCdTe/CdTe system is investigated for use in distributed Bragg reflectors. The modelled performance is described, and compared to an as-grown structure. As-grown 15 layer structures with arithmetically varying layer thickness are also annealed at 250degC and performance re-evaluated at 2, 7 and 24 hours anneal times. There is some shifting of the absorption edge after annealing , and some degradation...
Surface preparation is critical in the passivation of HgCdTe photovoltaic devices, as poor surface quality can create a fixed surface charge, and fixed, fast and slow interface traps. Two similar photovoltaic arrays with different surface preparation techniques are investigated; one has an additional step of anodic oxide growth and removal before the surface passivation is performed. A flood illumination...
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