Highly efficient semiconductor-based metasurface for photoelectrochemical water splitting: broadband light perfect absorption with dimensions smaller than the diffusion length

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buir.contributor.authorGhobadi, Amir
buir.contributor.authorUlusoy-Ghobadi, Türkan Gamze
buir.contributor.authorKaradaş, Ferdi
buir.contributor.authorÖzbay, Ekmel
buir.contributor.orcidÖzbay, Ekmel|0000-0003-2953-1828
dc.citation.epage839en_US
dc.citation.issueNumber3en_US
dc.citation.spage829en_US
dc.citation.volumeNumber15en_US
dc.contributor.authorGhobadi, Amiren_US
dc.contributor.authorUlusoy-Ghobadi, Türkan Gamzeen_US
dc.contributor.authorKaradaş, Ferdien_US
dc.contributor.authorÖzbay, Ekmelen_US
dc.date.accessioned2020-02-04T08:03:17Zen_US
dc.date.available2020-02-04T08:03:17Zen_US
dc.date.issued2020en_US
dc.departmentDepartment of Chemistryen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractIn this paper, we demonstrate a highly efficient light trapping design that is made of a metal-oxide-semiconductor-semiconductor (nanograting/nanopatch) (MOSSg/p) four-layer design to absorb light in a broad wavelength regime in dimensions smaller than the hole diffusion length of the active layer. For this aim, we first adopt a modeling approach based on the transfer matrix method (TMM) to find out the absorption bandwidth (BW) limits of a simple hematite (α-Fe2O3)-based metal-oxide-semiconductor (MOS) cavity design. Our modeling findings show that this design architecture can provide near-perfect absorption in shorter wavelengths. To extend the absorption toward longer wavelengths, a nanostructured semiconductor is placed on top of this MOS design. This nanostructure supports the Mie resonance and adds a new resonance in longer wavelengths without disrupting the lower wavelength absorption capability of MOS cavity. By this way, a polarization-insensitive absorption above 0.8 can be acquired up to λ=565 nm. Moreover, to have a better qualitative comparison, the water-splitting photocurrent of this design has been estimated. Our calculations show that a photocurrent as high as 10.6 mA cm−2 can be achieved with this design that is quite close to the theoretical limit of 12.5 mA cm−2 for hematite-based water-splitting photoanode. This paper proposes a design approach in which the superposition of cavity modes and Mie resonances can lead to a broadband, polarization-insensitive, and omnidirectional near-perfect light absorption in dimensions smaller than the carrier’s diffusion length. This can be considered as a winning strategy to design highly efficient and ultrathin optoelectronic designs in a variety of applications including photoelectrochemical water splitting and photovoltaics.en_US
dc.description.provenanceSubmitted by Zeynep Aykut (zeynepay@bilkent.edu.tr) on 2020-02-04T08:03:17Z No. of bitstreams: 1 Highly_efficient_semiconductor_based_metasurface_for_photoelectrochemical_water_splitting_broadband_light_perfect_absorption_with_dimensions_smaller_than_the_diffusion_length.pdf: 2472451 bytes, checksum: 795fcca6c041e88eb3834161fa3715e9 (MD5)en
dc.description.provenanceMade available in DSpace on 2020-02-04T08:03:17Z (GMT). No. of bitstreams: 1 Highly_efficient_semiconductor_based_metasurface_for_photoelectrochemical_water_splitting_broadband_light_perfect_absorption_with_dimensions_smaller_than_the_diffusion_length.pdf: 2472451 bytes, checksum: 795fcca6c041e88eb3834161fa3715e9 (MD5) Previous issue date: 2019en
dc.identifier.doi10.1007/s11468-019-01095-5en_US
dc.identifier.issn1557-1955
dc.identifier.urihttp://hdl.handle.net/11693/53033
dc.language.isoEnglishen_US
dc.publisherSpringeren_US
dc.relation.isversionofhttps://dx.doi.org/10.1007/s11468-019-01095-5en_US
dc.source.titlePlasmonicsen_US
dc.subjectMetamaterialsen_US
dc.subjectSemiconductor metasurfacesen_US
dc.subjectPerfect absorberen_US
dc.subjectPlasmonicsen_US
dc.subjectPhotochemistryen_US
dc.subjectLight-driven water splittingen_US
dc.titleHighly efficient semiconductor-based metasurface for photoelectrochemical water splitting: broadband light perfect absorption with dimensions smaller than the diffusion lengthen_US
dc.typeArticleen_US

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