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Highly porous TiO2 films for dye sensitized solar cells

Tricoli, Antonio; Wallerand, Anna S.; Righettoni, M

Description

Highly porous nanoparticle films were investigated as alternative working electrode morphology for the synthesis of dye sensitized solar cells (DSSCs). These films were rapidly assembled by flame synthesis and direct aerosol deposition of TiO2 nanoparticles with high specific surface area. Structural-functional analysis of their properties revealed that the film porosity is a key parameter greatly determining the resulting energy conversion efficiency (η). In fact, aerosol deposition at low...[Show more]

dc.contributor.authorTricoli, Antonio
dc.contributor.authorWallerand, Anna S.
dc.contributor.authorRighettoni, M
dc.date.accessioned2015-12-07T22:43:18Z
dc.identifier.issn0959-9428
dc.identifier.urihttp://hdl.handle.net/1885/24954
dc.description.abstractHighly porous nanoparticle films were investigated as alternative working electrode morphology for the synthesis of dye sensitized solar cells (DSSCs). These films were rapidly assembled by flame synthesis and direct aerosol deposition of TiO2 nanoparticles with high specific surface area. Structural-functional analysis of their properties revealed that the film porosity is a key parameter greatly determining the resulting energy conversion efficiency (η). In fact, aerosol deposition at low substrate temperatures (∼100 °C) led to very high porosity (ε = 98%) and weak film cohesion. These films were easily resuspended upon immersion in the dye and/or electrolyte solutions resulting in very poor performances (η = 0.08%). In contrast, allowing for partial nanoparticle sintering by deposition at moderate temperatures (∼400 °C) decreased the film porosity from 98 to 95% leading to higher mechanical stability and partially preserving the large surface required for dye adsorption. As a result, these films had drastically higher current density (12.2 mA cm-2) and overall performances (η = 5%) representing an 8 times improvement with respect to the best reported for similar highly porous morphologies. Remarkably, their conversion efficiency decreased only slightly with increasing film thickness reaching 4.6% at 128 m. This unique attribute suggests that high film porosity may inhibit recombination losses enabling utilization of thick films with enhanced light absorption properties.
dc.publisherRoyal Society of Chemistry
dc.sourceJournal of Materials Chemistry
dc.subjectKeywords: Absorption property; Aerosol deposition; Dye adsorption; Dye sensitized solar cell; Dye-sensitized solar cells; Electrolyte solutions; Film porosity; High porosity; High specific surface area; Key parameters; Low substrate temperature; Moderate temperatur
dc.titleHighly porous TiO2 films for dye sensitized solar cells
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume22
dc.date.issued2012
local.identifier.absfor091299 - Materials Engineering not elsewhere classified
local.identifier.ariespublicationu4628727xPUB35
local.type.statusPublished Version
local.contributor.affiliationTricoli, Antonio, College of Engineering and Computer Science, ANU
local.contributor.affiliationWallerand, Anna S., Swiss Federal Institute of Technology Zurich (ETH Zurich)
local.contributor.affiliationRighettoni, M, Swiss Federal Institute of Technology Zurich (ETH Zurich)
local.description.embargo2037-12-31
local.bibliographicCitation.issue28
local.bibliographicCitation.startpage14254
local.bibliographicCitation.lastpage14261
local.identifier.doi10.1039/c2jm15953h
local.identifier.absseo970109 - Expanding Knowledge in Engineering
dc.date.updated2016-02-24T11:14:56Z
local.identifier.scopusID2-s2.0-84863708076
CollectionsANU Research Publications

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