Guided-mode resonance gratings for enhanced mid-infrared absorption in quantum dot intermediate-band solar cells

Elsehrawy, Farid; Niemi, Tapio; Cappelluti, Federica

doi:10.1364/oe.26.00a352

Cited by 11 publications

(7 citation statements)

References 18 publications

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“…Moreover, light-trapping techniques can be exploited to further increase first and second photon optical transitions, increasing the short-circuit current and preserving the open circuit voltage thanks to the improved ratio between optical and thermal extraction rates from the IB. 31,38,39…”

Section: Discussionmentioning

confidence: 99%

“…Multiple layers of dots need to be stacked to achieve significant sub‐gap absorption, and this is feasible in principle, since the GaAs/AlGaAs system is strain‐free, without the introduction of crystal defects. Moreover, light‐trapping techniques can be exploited to further increase first and second photon optical transitions, increasing the short‐circuit current and preserving the open circuit voltage thanks to the improved ratio between optical and thermal extraction rates from the IB 31,38,39 …”

Section: Discussionmentioning

confidence: 99%

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Enhancing intermediate band solar cell performances through quantum engineering of dot states by droplet epitaxy

Scaccabarozzi

Vichi

Bietti

et al. 2023

Progress in Photovoltaics

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We report the effect of the quantum dot aspect ratio on the sub‐gap absorption properties of GaAs/AlGaAs quantum dot intermediate band solar cells. We have grown AlGaAs solar cells containing GaAs quantum dots made by droplet epitaxy. This technique allows the realization of strain‐free nanostructures with lattice matched materials, enabling the possibility to tune the size, shape, and aspect ratio to engineer the optical and electrical properties of devices. Intermediate band solar cells have been grown with different dot aspect ratio, thus tuning the energy levels of the intermediate band. Here, we show how it is possible to tune the sub‐gap absorption spectrum and the extraction of charge carriers from the intermediate band states by simply changing the aspect ratio of the dots. The tradeoff between thermal and optical extraction is in fact fundamental for the correct functioning of the intermediate band solar cells. The combination of the two effects makes the photonic extraction mechanism from the quantum dots increasingly dominant at room temperature, allowing for a reduction of the open circuit voltage of only 14 mV, compared to the reference cell.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Enhancing intermediate band solar cell performances through quantum engineering of dot states by droplet epitaxy

Scaccabarozzi

Vichi

Bietti

et al. 2023

Progress in Photovoltaics

Self Cite

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“…They also accomplished the tracking of the sun via translational micro-tracking completely and it demonstrates the potential for concentrating photovoltaic modules with significant higher efficiency than industry standard silicon photovoltaic. (Geometric optical design, Photovoltaic) Elshrawy et al [7] proposed 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 sunwavelength diffraction grating. The design guideline they proposed, which is presented for energy and strength for the second-photon absorption for III-V quantum dots, can also be applied to quantum dot infrared detectors.…”

Section: Photovoltaicsmentioning

confidence: 99%

Feature issue introduction: light, energy and the environment, 2017

Liu¹,

Beard²,

Isabella³

et al. 2018

Opt. Express

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The editors introduce the feature issue on "Energy, Light and the Environment (LEE) 2017", which is based on the topics presented at a congress of the same name held in Boulder, CO, US, from November 6 to November 9. This feature issue presents 13 papers selected from the voluntary submissions by attendees who presented at the progress and have extended their work into complete research articles. The feature issue highlights contributions from authors who presented their research at this congress.

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“…Elshrawy et al [7] proposed 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 sunwavelength diffraction grating. The design guideline they proposed, which is presented for energy and strength for the second-photon absorption for III-V quantum dots, can also be applied to quantum dot infrared detectors.…”

Section: Photovoltaicsmentioning

confidence: 99%