Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells

Abstract Outdoor devices comprising materials with mid-IR emissions at the atmospheric window (8–13 μm) achieve passive heat dissipation to outer space (~ − 270 °C), besides the atmosphere, being suitable for cooling applications. Recent studies have shown that the micro-scale photonic patterning of...

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Autores principales:	George Perrakis, Anna C. Tasolamprou, George Kenanakis, Eleftherios N. Economou, Stelios Tzortzakis, Maria Kafesaki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0d2eaa28bfed44e6b2c5800e40a101e4
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spelling	oai:doaj.org-article:0d2eaa28bfed44e6b2c5800e40a101e42021-12-02T18:25:05ZCombined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells10.1038/s41598-021-91061-12045-2322https://doaj.org/article/0d2eaa28bfed44e6b2c5800e40a101e42021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91061-1https://doaj.org/toc/2045-2322Abstract Outdoor devices comprising materials with mid-IR emissions at the atmospheric window (8–13 μm) achieve passive heat dissipation to outer space (~ − 270 °C), besides the atmosphere, being suitable for cooling applications. Recent studies have shown that the micro-scale photonic patterning of such materials further enhances their spectral emissivity. This approach is crucial, especially for daytime operation, where solar radiation often increases the device heat load. However, micro-scale patterning is often sub-optimal for other wavelengths besides 8–13 μm, limiting the devices’ efficiency. Here, we show that the superposition of properly designed in-plane nano- and micro-scaled periodic patterns results in enhanced device performance in the case of solar cell applications. We apply this idea in scalable, few-micron-thick, and simple single-material (glass) radiative coolers on top of simple-planar Si substrates, where we show an ~ 25.4% solar absorption enhancement, combined with a ~ ≤ 5.8 °C temperature reduction. Utilizing a coupled opto-electro-thermal modeling we evaluate our nano-micro-scale cooler also in the case of selected, highly-efficient Si-based photovoltaic architectures, where we achieve an efficiency enhancement of ~ 3.1%, which is 2.3 times higher compared to common anti-reflection layers, while the operating temperature of the device also decreases. Besides the enhanced performance of our nano-micro-scale cooler, our approach of superimposing double- or multi-periodic gratings is generic and suitable in all cases where the performance of a device depends on its response on more than one frequency bands.George PerrakisAnna C. TasolamprouGeorge KenanakisEleftherios N. EconomouStelios TzortzakisMaria KafesakiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q George Perrakis Anna C. Tasolamprou George Kenanakis Eleftherios N. Economou Stelios Tzortzakis Maria Kafesaki Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
description	Abstract Outdoor devices comprising materials with mid-IR emissions at the atmospheric window (8–13 μm) achieve passive heat dissipation to outer space (~ − 270 °C), besides the atmosphere, being suitable for cooling applications. Recent studies have shown that the micro-scale photonic patterning of such materials further enhances their spectral emissivity. This approach is crucial, especially for daytime operation, where solar radiation often increases the device heat load. However, micro-scale patterning is often sub-optimal for other wavelengths besides 8–13 μm, limiting the devices’ efficiency. Here, we show that the superposition of properly designed in-plane nano- and micro-scaled periodic patterns results in enhanced device performance in the case of solar cell applications. We apply this idea in scalable, few-micron-thick, and simple single-material (glass) radiative coolers on top of simple-planar Si substrates, where we show an ~ 25.4% solar absorption enhancement, combined with a ~ ≤ 5.8 °C temperature reduction. Utilizing a coupled opto-electro-thermal modeling we evaluate our nano-micro-scale cooler also in the case of selected, highly-efficient Si-based photovoltaic architectures, where we achieve an efficiency enhancement of ~ 3.1%, which is 2.3 times higher compared to common anti-reflection layers, while the operating temperature of the device also decreases. Besides the enhanced performance of our nano-micro-scale cooler, our approach of superimposing double- or multi-periodic gratings is generic and suitable in all cases where the performance of a device depends on its response on more than one frequency bands.
format	article
author	George Perrakis Anna C. Tasolamprou George Kenanakis Eleftherios N. Economou Stelios Tzortzakis Maria Kafesaki
author_facet	George Perrakis Anna C. Tasolamprou George Kenanakis Eleftherios N. Economou Stelios Tzortzakis Maria Kafesaki
author_sort	George Perrakis
title	Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
title_short	Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
title_full	Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
title_fullStr	Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
title_full_unstemmed	Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
title_sort	combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0d2eaa28bfed44e6b2c5800e40a101e4
work_keys_str_mv	AT georgeperrakis combinednanoandmicrostructuringforenhancedradiativecoolingandefficiencyofphotovoltaiccells AT annactasolamprou combinednanoandmicrostructuringforenhancedradiativecoolingandefficiencyofphotovoltaiccells AT georgekenanakis combinednanoandmicrostructuringforenhancedradiativecoolingandefficiencyofphotovoltaiccells AT eleftheriosneconomou combinednanoandmicrostructuringforenhancedradiativecoolingandefficiencyofphotovoltaiccells AT steliostzortzakis combinednanoandmicrostructuringforenhancedradiativecoolingandefficiencyofphotovoltaiccells AT mariakafesaki combinednanoandmicrostructuringforenhancedradiativecoolingandefficiencyofphotovoltaiccells
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Combined nano and micro structuring for enhanced radiative cooling and efficiency of photovoltaic cells

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