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Switchable Photocurrent Generation in an Ultrathin Resonant Cavity Solar Cell

Götz, Maximilian and Lengert, Maren and Osterthun, Norbert and Gehrke, Kai and Vehse, Martin and Agert, Carsten (2020) Switchable Photocurrent Generation in an Ultrathin Resonant Cavity Solar Cell. ACS Photonics, 7 (4), pp. 1022-1029. American Chemical society (ACS). doi: 10.1021/acsphotonics.9b01734. ISSN 2330-4022.

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Official URL: http://dx.doi.org/10.1021/acsphotonics.9b01734

Abstract

Fabry-Perot-type resonant nanocavities allow for broadband enhancement of light absorption in ultrathin absorber layers. By introducing a switchable mirror, these thin film structures can be used as unique optical devices enabling interesting applications with switchable absorption. We use a thin film photovoltaic layer stack based on an amorphous germanium absorber layer and combine it with a thin Mg/Pd mirror to create a switchable solar cell. In this work we demonstrate how we can switch the light absorption and, hence, the photocurrent generation of the thin film solar cell by changing the refractive index of Mg due to hydrogen absorption. Our results show how optical resonances in the absorber can be switched on/off by the change of optical properties of the magnesium reflector. The multilayer system can be switched from a light absorbing and photocurrent generating state to a transparent window state with excellent color neutrality. We emphasize our study as an important step toward the realization of switchable photovoltaic windows, which paves the way for larger scale building integrated photovoltaic applications.

Item URL in elib:https://elib.dlr.de/135673/
Document Type:Article
Additional Information:To access the final edited and published work see http://pubs.acs.org/articlesonrequest/AOR-FGVA3QFPR3FKI2AJ64UX
Title:Switchable Photocurrent Generation in an Ultrathin Resonant Cavity Solar Cell
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Götz, MaximilianMaximilian.Goetz (at) dlr.dehttps://orcid.org/0000-0002-6078-4359
Lengert, MarenMaren.Lengert (at) dlr.deUNSPECIFIED
Osterthun, Norbertnorbert.osterthun (at) dlr.dehttps://orcid.org/0000-0003-2668-6605
Gehrke, KaiKai.Gehrke (at) dlr.dehttps://orcid.org/0000-0002-0591-8289
Vehse, Martinmartin.vehse (at) dlr.dehttps://orcid.org/0000-0003-0578-6121
Agert, CarstenCarsten.Agert (at) dlr.dehttps://orcid.org/0000-0003-4733-5257
Date:11 March 2020
Journal or Publication Title:ACS Photonics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:7
DOI :10.1021/acsphotonics.9b01734
Page Range:pp. 1022-1029
Publisher:American Chemical society (ACS)
ISSN:2330-4022
Status:Published
Keywords:Ultra-thin absorber, amorphous germanium, photovoltaic, smart window, light trapping, switchable magnesium mirror
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
Deposited By: Götz, Maximilian
Deposited On:04 Aug 2020 15:27
Last Modified:11 Mar 2021 03:00

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