Meddeb, Hosni und Osterthun, Norbert und Götz, Maximilian und Sergeev, Oleg und Gehrke, Kai und Vehse, Martin und Agert, Carsten (2020) Quantum Well Solar Cell Using Ultrathin Germanium Nanoabsorber. IEEE Xplore-Digital library. 47th IEEE Photovoltaic Specialists Conference, 2020-06-15 - 2020-08-21, Virtual online. doi: 10.1109/PVSC45281.2020.9301016.
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Offizielle URL: https://www.pvsc-proceedings.org/?term=Fundamentals%20and%20New%20Concepts%20for%20Future%20Technologies#
Kurzfassung
Quantum-confining nanostructures are a key approach for efficient solar energy conversion in advanced designs of photovoltaic devices. In this study, we report the first demonstration of quantum confinement (QC) effects in single quantum well (QW) solar cells based on ultrathin hydrogenated amorphous germanium (a-Ge:H) nanoabsorber embedded in optical resonant nanocavity, using cost-effective, industrial-compatible and low-temperature production processes. Due to a drastic reduction of a-Ge:H QW thickness from 20 nm down below 2 nm, the quantum size effects are manifested, inducing a significant modulation of the energy bandgap from 0.98 eV up to 1.56 eV. In single QW a-Ge:H solar cell, due to QC effects, the band gap widening and the upward shift of conduction band edge reduce the band offset at the a-Ge:H /a-Si:H heterojunction, leading to considerable tuning of the photovoltaic characteristics, while maintaining a comparable power conversion level. The decrease in the photo generation current density (Jsc) due to the reduction of nanoabsorber thickness from 20 nm down below 2 nm is compensated by a major gain up to a factor of two in open-circuit voltage (Voc) exceeding 700 mV and a considerable enhancement of the fill factor (FF) from 45 to 65 %. Moreover, due to the reduction of nanoabsorber thickness, high transmittance above 65% through the n-i-p multilayers without back reflector is achieved. The successful demonstration of ultrathin a-Ge:H QW solar cells underlines the promising potential of bandgap engineering and multiple quantum confining nanostructures in our device technology with high relevance for semi-transparent power-generating systems, especially in window-integrated PV or in greenhouses, when combined with appropriate transparent conductive electrodes.
elib-URL des Eintrags: | https://elib.dlr.de/139934/ | ||||||||||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||||||||||
Titel: | Quantum Well Solar Cell Using Ultrathin Germanium Nanoabsorber | ||||||||||||||||||||||||||||||||
Autoren: |
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Datum: | Januar 2020 | ||||||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||||||||||
DOI: | 10.1109/PVSC45281.2020.9301016 | ||||||||||||||||||||||||||||||||
Verlag: | IEEE Xplore-Digital library | ||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||
Stichwörter: | ultrathin solar cell, semiconductor nanostructures, quantum well, quantum confinement, resonant absorbing nanocavity | ||||||||||||||||||||||||||||||||
Veranstaltungstitel: | 47th IEEE Photovoltaic Specialists Conference | ||||||||||||||||||||||||||||||||
Veranstaltungsort: | Virtual online | ||||||||||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||||||||||
Veranstaltungsbeginn: | 15 Juni 2020 | ||||||||||||||||||||||||||||||||
Veranstaltungsende: | 21 August 2020 | ||||||||||||||||||||||||||||||||
Veranstalter : | IEEE Committee | ||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||||||||||||||||||
HGF - Programm: | TIG Technologie, Innovation und Gesellschaft | ||||||||||||||||||||||||||||||||
HGF - Programmthema: | Erneuerbare Energie- und Materialressourcen für eine nachhaltige Zukunft | ||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | E SY - Energiesystemanalyse | ||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Energiesystemtechnik (alt) | ||||||||||||||||||||||||||||||||
Standort: | Oldenburg | ||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Vernetzte Energiesysteme > Stadt- und Gebäudetechnologien | ||||||||||||||||||||||||||||||||
Hinterlegt von: | Meddeb Dite Hasanet, Hosni | ||||||||||||||||||||||||||||||||
Hinterlegt am: | 04 Jan 2021 15:20 | ||||||||||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:40 |
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