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Quantum confinement-tunable solar cell based on ultrathin amorphous germanium

Meddeb, Hosni and Osterthun, Norbert and Götz, Maximilian and Sergeev, Oleg and Gehrke, Kai and Vehse, Martin and Agert, Carsten (2020) Quantum confinement-tunable solar cell based on ultrathin amorphous germanium. Nano Energy, 76, p. 105048. Elsevier. doi: 10.1016/j.nanoen.2020.105048. ISSN 2211-2855.

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Official URL: http://dx.doi.org/10.1016/j.nanoen.2020.105048


Nanoscale semiconductors involve distinct fundamental phenomena and novel properties emerge due to dimensional restriction of the charge carriers’ motion, known as quantum confinement (QC). In this study, the first investigation of quantum size effects in single quantum well (QW) solar cells based on ultrathin hydrogenated amorphous germanium (a-Ge:H) nanoabsorber is reported, using cost-effective, industrial-compatible and low-temperature production processes. The confinement in the growth direction due to the thickness reduction of the a-Ge:H absorber layer from 20 nm down below 2 nm, results in tunable optoelectronic properties and photovoltaics (PV) characteristics, while maintaining a comparable power conversion level. A major gain by a factor of two in open circuit-voltage is demonstrated, exceeding 700 mV with reducing the a-Ge:H QW thickness by an order of magnitude. Furthermore, the band gap widening yields a considerable enhancement of the fill factor from 45 to 65% due to the reduction of the conduction band offset at a-Ge:H (QW)/a-Si:H (barrier) heterojunction interface. The successful demonstration of a-Ge:H QW cells indicates the promising potential for multiple QWs implementation as nanoabsorber material in solar cells.

Item URL in elib:https://elib.dlr.de/137859/
Document Type:Article
Title:Quantum confinement-tunable solar cell based on ultrathin amorphous germanium
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Meddeb, HosniUNSPECIFIEDhttps://orcid.org/0000-0001-8939-7910UNSPECIFIED
Osterthun, NorbertUNSPECIFIEDhttps://orcid.org/0000-0003-2668-6605UNSPECIFIED
Götz, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-6078-4359UNSPECIFIED
Gehrke, KaiUNSPECIFIEDhttps://orcid.org/0000-0002-0591-8289UNSPECIFIED
Vehse, MartinUNSPECIFIEDhttps://orcid.org/0000-0003-0578-6121UNSPECIFIED
Agert, CarstenUNSPECIFIEDhttps://orcid.org/0000-0003-4733-5257UNSPECIFIED
Date:19 June 2020
Journal or Publication Title:Nano Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 105048
EditorsEmailEditor's ORCID iDORCID Put Code
Vomiero, AlbertoLuleå University of TechnologyUNSPECIFIEDUNSPECIFIED
Keywords:Quantum confinement Quantum well Amorphous germanium nanostructure Optical resonant planar nanocavity Ultrathin film solar cell
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: Meddeb Dite Hasanet, Hosni
Deposited On:03 Dec 2020 11:45
Last Modified:23 Oct 2023 14:09

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