Resonant-cavity infrared detector with five-quantum-well absorber and 34% external quantum efficiency at 4 µm.
Opt Express
; 27(3): 3771-3781, 2019 Feb 04.
Article
em En
| MEDLINE
| ID: mdl-30732391
ABSTRACT
We report resonant-cavity infrared detectors with 34% external quantum efficiency at room temperature at the resonant wavelength of 4.0 µm, even though the absorber consists of only five quantum wells with a total thickness of 50 nm. The full width at half maximum (FWHM) linewidth is 46 nm, and the peak absorption is enhanced by nearly a factor of 30 over that for a single pass through the absorber. In spite of an unfavorable Shockley-Read lifetime in the current material, the dark current density is at the level of state-of-the-art HgCdTe detectors as quantified by "Rule 07." The Johnson-noise limited detectivity (D*) at 21°C is 7 × 109 cm Hz½/W. We expect that future improvements in the device design and material quality will lead to higher quantum efficiency, as well as a significant reduction of the dark current density consistent with the very thin absorber.
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MEDLINE
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En
Ano de publicação:
2019
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Article