Design and fabrication of strain-balanced nBn dual-band LWIR/LWIR focal plane arrays based on InAsSb/InAsType-II superlattices, Phase I

Metadata Updated: July 17, 2020

The infrared spectral range is of particular interest for remote planetary sensing of gaseous molecules, such as H2O, CO2, CH4, N2O, CO, NH3, and many other compounds. Infrared thermography can also be used to accurate measure minute variations in surface temperatures. High performance infrared focal plane arrays (FPAs) allow rapid acquisition of a 2D surface maps--indispensable in planetary sciences. By using two different cut-off detectors integrated into a single FPA to simultaneously image a planet we can avoid atmospheric effect and much more accurately map minute variations in the surface temperature, or gain a clearer picture of the atmospheric composition.

In recent years, Type-II InAs/GaSb superlattices have experienced significant development[HTML_REMOVED]we have played a pioneering role in the rapid development of that technology. However, the full potential of Type-II superlattice has not been fully explored and alternate superlattice architectures hold great promise; one of the most promising is gallium free InAsSb/InAs Type-II superlattices. In this project, we propose to study strain-balanced nBn InAs1-xSbx/InAs Type-II superlattice-based photodetectors and mini-arrays for LWIR/LWIR dual-band detection. Using this new superlattice structure, it is expected to achieve longer minority carrier lifetime. Longer minority carrier lifetime results in lower dark current, lower noise, higher operation temperature, and higher quantum efficiency. Applying this superlattice design to dual-band LWIR/LWIR FPAs, it is expected to achieve higher quantum efficiency, lower dark current, higher specific detectivity (D*) and reduced Noise Equivalent Temperature Difference (NETD). This work will form the basis of the Phase II work in which we will use this new superlattice structure to develop and deliver LWIR/LWIR dual-band FPAs for planetary sciences.

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Metadata Created Date August 1, 2018
Metadata Updated Date July 17, 2020

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Harvested from NASA Data.json

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Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date July 17, 2020
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_34064
Public Access Level public
Bureau Code 026:00
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Harvest Object Id 466872a6-a6b4-47dc-9ac6-52c2c52426c0
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2016-06-01
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Data Last Modified 2020-01-29
Program Code 026:027
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Source Hash fb2bd4a4847c183d15d72d0b3d6606da57330a38
Source Schema Version 1.1

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