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Quantum Well Solar Cell Using Ultrathin Germanium Nanoabsorber

Meddeb, Hosni and Osterthun, Norbert and Götz, Maximilian and Sergeev, Oleg and Gehrke, Kai and Vehse, Martin and Agert, Carsten (2020) Quantum Well Solar Cell Using Ultrathin Germanium Nanoabsorber. IEEE Xplore-Digital library. 47th IEEE Photovoltaic Specialists Conference, 15 June - 21 August 2020, Virtual online. (In Press)

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Official URL: https://www.pvsc-proceedings.org/?term=Fundamentals%20and%20New%20Concepts%20for%20Future%20Technologies#

Abstract

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.

Item URL in elib:https://elib.dlr.de/139934/
Document Type:Conference or Workshop Item (Speech)
Title:Quantum Well Solar Cell Using Ultrathin Germanium Nanoabsorber
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Meddeb, Hosnihosni.meddeb (at) dlr.dehttps://orcid.org/0000-0001-8939-7910
Osterthun, Norbertnorbert.osterthun (at) dlr.dehttps://orcid.org/0000-0003-2668-6605
Götz, MaximilianMaximilian.Goetz (at) dlr.dehttps://orcid.org/0000-0002-6078-4359
Sergeev, Olegoleg.sergeev (at) dlr.deUNSPECIFIED
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:January 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Publisher:IEEE Xplore-Digital library
Status:In Press
Keywords:ultrathin solar cell, semiconductor nanostructures, quantum well, quantum confinement, resonant absorbing nanocavity
Event Title:47th IEEE Photovoltaic Specialists Conference
Event Location:Virtual online
Event Type:international Conference
Event Dates:15 June - 21 August 2020
Organizer:IEEE Committee
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:04 Jan 2021 15:20
Last Modified:04 Jan 2021 15:20

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