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Investigation of electronic band structure and charge transfer mechanism of oxidized three-dimensional graphene as metal-free anodes material for dye sensitized solar cell application
Nanyang Technol Univ, Sch Elect & Elect Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;CINTRA, UMI 3288, Res Techno Plaza,50 Nanyang Dr, Singapore 637553, Singapore..
Nanyang Technol Univ, Energy Res Inst NTU ERI N, Res Techno Plaza,50 Nanyang Dr, Singapore 637553, Singapore..
ASTAR, Inst High Performance Comp, 1 Fusionopolis Way, Singapore 138632, Singapore..
Soreq NRC, Space Environm Sect, IL-81800 Yavne, Israel..
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2017 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 685, p. 442-450Article in journal (Refereed) Published
Abstract [en]

Dye-sensitized solar cells (DSSCs) offer an optimal trade-off between conversion-efficiency and low-cost fabrication. However, since all its electrodes need to fulfill stringent work-function requirements, its materials have remained unchanged since DSSC's first report early-90s. Here we describe a new material, oxidized-three-dimensional-graphene (o-3D-C), with a band gap of 0.2 eV and suitable electronic band-structure as alternative metal-free material for DSSCs-anodes. o-3D-C/dye-complex has a strong chemical bonding via carboxylic-group chemisorption with full saturation after 12 sec at capacity of similar to 450 mg/g (600x faster and 7x higher than optimized metal surfaces). Furthermore, fluorescence quenching of life-time by 28-35% was measured demonstrating charge-transfer from dye to o-3D-C.

Place, publisher, year, edition, pages
2017. Vol. 685, p. 442-450
Keywords [en]
Dye-sensitized solar cell (DSSC), Three-dimensional graphene (3D-C), Adsorption dynamics, Fluorescence quenching
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-336307DOI: 10.1016/j.cplett.2017.08.011ISI: 000410841500069OAI: oai:DiVA.org:uu-336307DiVA, id: diva2:1176011
Available from: 2018-01-19 Created: 2018-01-19 Last updated: 2018-01-19Bibliographically approved

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Antila, Liisa J.

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