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PEDOT counter electrodes for dye-sensitized solar cells prepared by aqueous micellar electrodeposition
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Vise andre og tillknytning
2013 (engelsk)Inngår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 107, s. 45-51Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Electropolymerization of 3,4-ethylenedioxythiophene (EDOT) was performed in an aqueous micellar solution onto conducting glass and conducting flexible plastic substrates using a simple, scalable process. The background electrolyte in the process consisted merely of a micellar aqueous sodium dodecyl sulfate (SDS) solution. Electrodeposition of poly(3,4-ethylenedioxythiophene) (PEDOT) was conducted at constant current, resulting in homogeneous films, even on large sized conducting glass and plastic substrates (9 cm x 9 cm). The use of water as electrolyte, application on large substrates and applicability on flexible plastic substrates demonstrates the feasibility of this method for upscaling and use in industrial fabrication of DSCs. DSCs were assembled using three different PEDOT thicknesses on conducting glass as counter electrodes and a comparison was made with thermally platinized conducting glass counter electrodes. In cobalt tris(bipyridine)-based electrolyte, the catalytic performance of the PEDOT counter electrodes was significantly higher than that of platinized counter electrodes. DSCs with PEDOT counter electrodes gave higher efficiencies due to higher fill factors and a lower charge transfer resistance. The low charge transfer resistance and good catalytic performance of the PEDOT counter electrodes can be related to its mesoporous morphology resembling crumpled sheets of paper. 

sted, utgiver, år, opplag, sider
2013. Vol. 107, s. 45-51
Emneord [en]
Dye-sensitized solar cell, Electrocatalyst, Cobalt tris(bipyridine), Charge-transfer resistance, Nanostructured electrode
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-212422DOI: 10.1016/j.electacta.2013.06.005ISI: 000326661200005OAI: oai:DiVA.org:uu-212422DiVA, id: diva2:677877
Tilgjengelig fra: 2013-12-10 Laget: 2013-12-10 Sist oppdatert: 2017-12-06bibliografisk kontrollert
Inngår i avhandling
1. Characterization of dye-sensitized solar cells: Components for environmentally friendly photovoltaics
Åpne denne publikasjonen i ny fane eller vindu >>Characterization of dye-sensitized solar cells: Components for environmentally friendly photovoltaics
2014 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

As fossil fuels, the major source of energy used today, create the greenhouse gas carbon dioxide which causes global warming, alternative energy sources are necessary in the future. There is a need for different types of renewable energy sources such as hydropower, windpower, wave- power and photovoltaics since different parts of the world have different possibilities. The sun is a never ending energy source. Photovoltaics use the energy of the sun and converts it into electricity. There are different types of photovoltaics and a combination of them could provide humankind with energy in a sustainable way. In this thesis dye-sensitized solar cells are investigated. Materials for the counter electrode have been investigated and resulting in a polymer based cathode outperforming the traditionally used platinized counter electrode in a cobalt-based redox mediator system (paper I). The sensitizer of the TiO2 was investigated, in this study by modifications of the π-linker unit in an organic donor-linker-acceptor based dye. Four new dyes were synthesized, all four showing extended absorption spectra compared to the reference dye. However, it was found that increasing the absorption spectrum does not neces- sarily increase the power conversion efficiency of the solar cell (paper II). In the last part of this thesis, water-based electrolyte dye-sensitized solar cells were investigated. A hydrophilic dye with glycolic chains close to the center of regeneration was synthesized. The results show increased wettability by water-based electrolyte for the sensitized surface, increased regenera- tion and performance for the hydrophilic dye compared to a hydrophobic dye (paper III). The glycolic chains complex with small cations such as Na+ and K+ in the electrolyte, this proba- bly facilitate the regeneration of the hydrophilic dye even further (paper IV). In this thesis new materials for a more environmentally friendly dye-sensitized solar cell are investigated.

sted, utgiver, år, opplag, sider
Uppsala: Ångström, 2014. s. 67
Emneord
solar cells, dye-sensitized solar cells
HSV kategori
Forskningsprogram
Kemi med inriktning mot fysikalisk kemi
Identifikatorer
urn:nbn:se:uu:diva-229939 (URN)
Presentation
2014-09-08, Room 80121, Ångström, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2014-08-18 Laget: 2014-08-18 Sist oppdatert: 2014-09-22bibliografisk kontrollert
2. Developing Environmentally Friendly Dye-sensitized Solar Cells
Åpne denne publikasjonen i ny fane eller vindu >>Developing Environmentally Friendly Dye-sensitized Solar Cells
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Due to climate change and its effects, alternative renewable energy sources are needed in the future human society. In the work of this thesis, the Dye-sensitized Solar Cell (DSC) has been investigated and characterized.

DSCs are appealing as energy conversion devices, since they have high potential to provide low cost solar light to electricity conversion. The DSC is built up by a working electrode consisting of a conductive glass substrate with a dye-sensitized mesoporous TiO2 film, a counter electrode with a catalyst and, in between, the electrolyte which performs the charge transport by means of a redox mediator. The aim of this thesis was to develop and evaluate cheap and environmentally friendly materials for the DSC.

An alternative polymer-based counter electrode catalyst was fabricated and evaluated, showing that the PEDOT catalyst counter electrode outperformed the platinum catalyst counter electrode. Different organic dyes were evaluated and it was found that the dye architecture affected the performance of the assembled DSCs. A partly hydrophilic organic triphenylamine dye was developed and applied in water-based electrolyte DSCs. The partly hydrophilic dye outperformed the reference hydrophobic dye. Small changes in dye architecture were evaluated for two similar dyes, both by spectroscopic and electrochemical techniques. A change in the length of the dialkoxyphenyl units on a triphenylamine dye, affected the recombination and the regeneration electron transfer kinetics in the DSC system. Finally, three water soluble cobalt redox couples were developed and applied in water-based electrolyte DSCs. An average efficiency of 5.5% (record efficiency of 5.7%) for a 100% water-based electrolyte DSC was achieved with the polymer-based catalyst counter electrode and an organic dye with short dimethoxyphenyl units, improving the wetting and the regeneration process.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2016. s. 82
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1351
Emneord
dye-sensitized solar cells, dye, cobalt, triphenylamine, titanium dioxide, aqueous, PEDOT
HSV kategori
Forskningsprogram
Kemi med inriktning mot fysikalisk kemi
Identifikatorer
urn:nbn:se:uu:diva-280291 (URN)978-91-554-9506-0 (ISBN)
Disputas
2016-04-29, Polhemsalen; Ång/10134, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2016-04-06 Laget: 2016-03-09 Sist oppdatert: 2016-05-24

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