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Enhancing passive radiative cooling properties of flexible CIGS solar cells for space applications using single layer silicon oxycarbonitride films

Banik, Udayan and Sasaki, Kaname and Reininghaus, Nies and Gehrke, Kai and Vehse, Martin and Sznajder, Maciej and Sproewitz, Tom and Agert, Carsten (2020) Enhancing passive radiative cooling properties of flexible CIGS solar cells for space applications using single layer silicon oxycarbonitride films. Solar Energy Materials and Solar Cells, 209, p. 110456. Elsevier. doi: 10.1016/j.solmat.2020.110456. ISSN 0927-0248.

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Official URL: http://dx.doi.org/10.1016/j.solmat.2020.110456

Abstract

Satellites in lower earth orbits have been primarily powered by photovoltaic modules. With growing power demand for new satellite concepts, solar cells are required to be flexible and ultra-lightweight to decrease launch costs. CIGS thin film solar technology is a promising candidate, since it can be manufactured on flexible substrates and possesses high radiation hardness. Poor radiative properties of CIGS on the other hand, lead to high temperatures and therefore power loss. High emissivity coatings on CIGS have already been reported but the influence on thermal and electrical aspects have not been addressed. Here we present the optical properties of silicon-oxycarbonitride coatings and their effect on electrical parameters on CIGS cells to be used for the DLR's GoSolAr power sail mission. We show that the single layer coating can significantly increase emissivity from 0.3 to 0.72, with minimal spectral losses and negligible impact on the functioning of the underlying CIGS cell. We simulated the thermal impact of the coating on solar cells in orbit and can predict that the maximum temperature of the cells is reduced by 30 °C, resulting in a significant power gain. Additionally, the coating has an emissivity of 0.87 in the atmospheric window of 8–13 μm making it a very good passive radiative cooler for terrestrial solar cells. The low-cost coating can replace glass and the process can be scaled up for large CIGS modules. The coating can also significantly increase the power to mass ratio of solar modules, reducing costs for space applications.

Item URL in elib:https://elib.dlr.de/135668/
Document Type:Article
Title:Enhancing passive radiative cooling properties of flexible CIGS solar cells for space applications using single layer silicon oxycarbonitride films
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Banik, UdayanUdayan.Banik (at) dlr.dehttps://orcid.org/0000-0003-2605-2215
Sasaki, Kanamekaname.sasaki (at) dlr.deUNSPECIFIED
Reininghaus, NiesNies.reininghaus (at) dlr.dehttps://orcid.org/0000-0002-9509-274X
Gehrke, KaiKai.Gehrke (at) dlr.dehttps://orcid.org/0000-0002-0591-8289
Vehse, Martinmartin.vehse (at) dlr.dehttps://orcid.org/0000-0003-0578-6121
Sznajder, MaciejMaciej.Sznajder (at) dlr.dehttps://orcid.org/0000-0002-9917-0581
Sproewitz, Tomtom.sproewitz (at) dlr.deUNSPECIFIED
Agert, Carstencarsten.agert (at) dlr.dehttps://orcid.org/0000-0003-4733-5257
Date:1 June 2020
Journal or Publication Title:Solar Energy Materials and Solar Cells
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:209
DOI :10.1016/j.solmat.2020.110456
Page Range:p. 110456
Publisher:Elsevier
ISSN:0927-0248
Status:Published
Keywords:Polysilazane Coating, Flexible CIGS solar cells, Mid-infrared emittance, Satellite solar Array, Thermo-electrical properties, Durazane 1800
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Energy Systems Technology (old)
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Urban and Residential Technologies
Institute of Space Systems > Mechanic and Thermal Systems
Deposited By: Banik, Udayan
Deposited On:04 Aug 2020 15:26
Last Modified:04 Aug 2020 15:26

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