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EnglishAchieving strong absorption of low-energy photons is one of the key issues to demonstrate quantum dot solar cells working in the intermediate band regime at practical concentration factors and operating temperatures. Guided-mode resonance effects may enable large enhancement of quantum dot intraband optical transitions. We propose quantum dot thin-film cells designed to have significant field waveguiding in the quantum dot stack region and patterned at the rear-side with a sub-wavelength diffraction grating. Remarkable increase of the optical path length at mid-infrared wavelengths is shown owing to guided-mode resonances. Design guidelines are presented for energy and strength of the second-photon absorption for III-V quantum dots, such as InAs/GaAs and GaSb/GaAs, whose intraband and intersubband transitions roughly extends over the 2 − 8 µm range. The proposed design can also be applied to quantum dot infrared detectors. Angle-selectivity is discussed in view of applications in concentrator photovoltaic systems and infrared imaging systems.
Guided-mode resonance gratings for enhanced mid-infrared absorption in quantum dot intermediate-band solar cells / Elsehrawy, Farid; Niemi, Tapio; Cappelluti, Federica. - In: OPTICS EXPRESS. - ISSN 1094-4087. - ELETTRONICO. - 26:6(2018), pp. A352-A359. [10.1364/OE.26.00A352]
| Titolo: | Guided-mode resonance gratings for enhanced mid-infrared absorption in quantum dot intermediate-band solar cells | |
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| Data di pubblicazione: | 2018 | |
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| Digital Object Identifier (DOI): | http://dx.doi.org/10.1364/OE.26.00A352 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| oe-26-6-A352.pdf | post print editoriale | 2a Post-print versione editoriale / Version of Record | PUBBLICO - Tutti i diritti riservati | Visibile a tuttiVisualizza/Apri |
http://hdl.handle.net/11583/2704866
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