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Author(s): Paula Dias
João Azevedo
Luísa Andrade
Adélio Mendes
Marcel Schreier
S. David Tilley
Jingshan Luo
Dongqin Bi
Anders Hagfeldt
Michael Grätzel
Matthew T. Mayer
Title: Transparent cuprous oxide photocathode enabling a stacked tandem cell for unbiased water splitting
Issue Date: 2015
Abstract: Photoelectrochemical water splitting represents an attractive method of capturing and storingthe immense energy of sunlight in the form of hydrogen, a clean chemical fuel. Given the largeenergetic demand of water electrolysis, and the defined spectrum of photons available from incidentsunlight, a two absorber tandem device is required to achieve high efficiencies. The twoabsorbers should beofdifferentandcomplementary bandgaps, connected in series to achieve thenecessary voltage, and arranged in an optical stack configuration to maximize the utilization ofsunlight.This latterrequirement demands atop device that is responsive to high-energy photonsbut also transparent to lower-energy photons, which pass through to illuminate the bottom absorber.Here, cuprous oxide (Cu2O) is employed as a top absorber component, and the factors influencingthe balance between transparencyandefficiency towardoperationinatandem configurationarestudied. Photocathodes based on Cu2O electrodeposited onto conducting glass substratestreated with thin, discontinuous layers of gold achieve reasonable sub-bandgap transmittancewhile retaining performances comparable to their opaque counterparts. This new high-performancetransparent photo- cathode is demonstrated in tandem with a hybrid perovskite photovoltaic cell,resulting in a full device capable of standalone sunlight-driven water splitting.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/621252//PECDEMO
info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/321315/Building Integrated Dye Sensitized Solar Cells/BI-DSC
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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