Momentum (k)-Space Charge Separation Mid-Wave Infrared Photodetectors Using SiGeSn Alloys
2021 IEEE Photonics Society Summer Topicals Meeting Series (SUM)（2021）
Abstract
We report a band-structure engineering approach with k-space charge-separation feature by tailoring the direct-energy valley to be several kBT higher than the indirect, enabling large absorption coefficients while maintaining long-carrier lifetimes. Modeling shows SiGeSn alloys with constant 3kBTΓ - and L-valley separation cover MWIR range.
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Key words
SiGeSn,charge separation,band-structure engineering,photodetector,MWIR
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