Novel IR photodetectors and energy harvesting devices

Kwong-Kit Choi; Achyut Dutta; Nibir Dhar

doi:10.1117/12.2590229

12 April 2021 Novel IR photodetectors and energy harvesting devices

Kwong-Kit Choi, Achyut Dutta, Nibir Dhar

Proceedings Volume 11723, Image Sensing Technologies: Materials, Devices, Systems, and Applications VIII; 1172303 (2021) https://doi.org/10.1117/12.2590229
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

For MWIR IR detectors, we designed a meta-surface to enhance QE across 2 to 6 microns. The relative enhancement depends on the intrinsic absorption coefficient, α, of the material. If α is large at 2x10⁴/cm, a 0.1 micron-thick metadetector can have a peak QE of 90%, which is 2.6 times higher than the conventional detector. The improvement is larger at a smaller α. When it is 2000/cm, the improvement is about 10 times with a peak QE of 49%. For energy harvesting devices, we designed several nanostructures etched on top of silicon solar cells to enhance their absorption. Employing an array of nano-columns increases absorption from 55% to 93% at 0.7 microns and from 5.0% to 20% at 1.0 microns. An array of nano-cones further increases the average absorption to 95% between 0.4 to 0.8 microns. The overall integrated absorption is increased by 71% for nano-columns and 91% for nano-cones. For GaAs solar cells, a metasurface can improve photocurrent by 26% from a planar solar cell with a 100 nm-thick absorber.

Conference Presentation

Citation Download Citation

Kwong-Kit Choi, Achyut Dutta, and Nibir Dhar "Novel IR photodetectors and energy harvesting devices", Proc. SPIE 11723, Image Sensing Technologies: Materials, Devices, Systems, and Applications VIII, 1172303 (12 April 2021); https://doi.org/10.1117/12.2590229

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