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Investigation of quantum size effects on the optical absorption in ultrathin single quantum well solar cell embedded as a nanophotonic resonator

Meddeb, Hosni and Götz-Köhler, Maximilian and Osterthun, Norbert and Sergeev, Oleg and Gehrke, Kai and Vehse, Martin and Agert, Carsten (2022) Investigation of quantum size effects on the optical absorption in ultrathin single quantum well solar cell embedded as a nanophotonic resonator. IEEE Journal of Photovoltaics, 12 (3), pp. 760-770. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/JPHOTOV.2022.3150726. ISSN 2156-3381.

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Official URL: https://ieeexplore.ieee.org/document/9729107


Subwavelength optical nanocavity using semiconductor nanostructures is a key nanophotonic approach for various optoelectronic devices. In such low-dimensional systems, size-dependent changes can arise due to quantum confinement (QC). In this article, the implications of quantum-size effects on the light harvesting in ultrathin single quantum well solar cell (SQWSC) are analyzed. This device is based on silicon (barrier)/germanium (QW) nanostructures integrated as a deep-subwavelength nanophotonic resonator. Compared with the state-of-the-art, the novelty of this article consists of the investigation of the synergy between photonic and electronic confinements at both functional materials and device levels. It is shown that QC effects enhance the optical absorption efficiency in both low-dimensional germanium single layers and QW structures. However, this is affected by the barrier heights and the interface states. In the SQWSC devices, the changes of the photocurrent output, the resonance condition and the absorption edge as a function of QW thickness are explained based on the optical field and the local absorption distributions. Shorter nanocavity lengths with thinner QW nanoabsorbers result in blue-shifted resonance wavelength, suitable maximum optical field intensity in the visible wavelengths range as well as promoted photonic confinement. This enables an enhancement of the optical absorption efficiency relative to thick counterparts. The nonlinearity in the thickness-related photocurrent implies a drastic reduction in QW thickness while preserving a high photocurrent level. The presented considerations in SQWC could be extended as design rules for the optimization of the photocurrent in derived multiple quantum well systems and for relevant color-neutral semitransparent devices.

Item URL in elib:https://elib.dlr.de/186190/
Document Type:Article
Title:Investigation of quantum size effects on the optical absorption in ultrathin single quantum well solar cell embedded as a nanophotonic resonator
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Meddeb, HosniUNSPECIFIEDhttps://orcid.org/0000-0001-8939-7910UNSPECIFIED
Götz-Köhler, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-6078-4359UNSPECIFIED
Osterthun, NorbertUNSPECIFIEDhttps://orcid.org/0000-0003-2668-6605UNSPECIFIED
Sergeev, OlegUNSPECIFIEDhttps://orcid.org/0000-0002-5022-6118UNSPECIFIED
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:4 March 2022
Journal or Publication Title:IEEE Journal of Photovoltaics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 760-770
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Absorbing nanophotonic resonator; quantum confinement; quantum well; semiconductor nanostructures; subwavelength optical nanocavity; ultrathin solar cell
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Digitalization and System Technology
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Energy System Technology
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Urban and Residential Technologies
Deposited By: Meddeb Dite Hasanet, Hosni
Deposited On:25 Apr 2022 11:47
Last Modified:25 Apr 2022 11:47

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