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Hole transporting dye as light harvesting antenna in dye sensitized TiO2 hybrid solar cells
Uppsala University, Disciplinary Domain of Science and Technology. (Hagfeldt)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Hagfeldt)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Leif Hammarström)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Hagfeldt)
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The pore volume in solid state dye-sensitized solar cells can be utilized for light harvesting by using hole transporting dyes (HTD) in addition to interface dyes (ID) bound to the surface of the meso-porous metal oxide scaffold. Triphenyl-amine based compounds were used both as HTD (TPTPA) and ID (D5L0A3). Energy transfer from the HTD to ID was investigated using steady state photoluminescence. The photoluminescence of the HTD is quenched in presence of the ID – both for samples where the HTD and ID were dispersed in a solid PMMA matrix and for solid samples measured on ZrO2 films. The regeneration of oxidized ID by the HTD after photo-induced electron injection into TiO2 was investigated using nanosecond transient absorption spectroscopy. In presence of the HTD signals, attributed to oxidized ID, vanished while spectral signatures suggesting the creation of oxidized HTD appeared. In solar cell devices comprising both the ID and HTD the spectral response of the external quantum efficiency shows that both dyes contribute to the photocurrent resulting in a 2-fold increase in photocurrent. The interface dye seems to prevent recombination giving rise to a higher open circuit voltage in the solar cell devices. Due to the increase both in photocurrent and voltage the solar cell device performance increased by a factor of 3. Utilizing a hole-transporting dye in addition to an interfacial sensitizer is a promising design concept for solid state dye sensitized solar cell devices. 

National Category
Physical Chemistry
URN: urn:nbn:se:uu:diva-168484OAI: oai:DiVA.org:uu-168484DiVA: diva2:498341
Available from: 2012-02-12 Created: 2012-02-12 Last updated: 2012-03-29
In thesis
1. XDSC: Excitonic Dye Solar Cells
Open this publication in new window or tab >>XDSC: Excitonic Dye Solar Cells
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Solar energy is the foremost power source of our planet. Driving photosynthesis on our planet for 3 billion years the energy stored in the form of fossil fuels also originates from the sun. Consumption of fossil fuels to generate energy is accompanied with CO2 emission which affects the earth's climate in a serious manner.

Therefore, alternative ways of converting energy have to be found. Solar cells convert sunlight directly into electricity and are therefore an important technology for future electricity generation.

In this work solar cells based on the inorganic semiconductor titanium dioxide and hole-transporting dyes are investigated. These type of solar cells are categorized as hybrid solar cells and are conceptually related to both dye-sensitized solar cells and organic solar cells. Light absorption in the bulk of the hole-transporting dye layer leads to the formation of excitons that can be harvested at the organic/inorganic interface. Two design approaches were investigated: 1) utilizing a multilayer of a hole-transporting dye and 2) utilizing a hole-transporting dye as light harvesting antenna to another dye which is bound to the titanium dioxide surface. 

Using a multiple dye layer in titanium dioxide/hole transporting dye devices, leads to an improved device performance as light harvested in the consecutive dye layers can contribute to the photocurrent. In devices using both an inteface-bound dye and a hole-transporting dye, excitation energy can be transferred from the hole-transporting dye to the interface dye. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 93 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 899
hybrid solar cells, energy transfer, dye-sensitized solar cells, TiO2, small-molecular semiconductor, hole-transporting dye
National Category
Physical Chemistry
Research subject
Chemistry with specialization in Physical Chemistry
urn:nbn:se:uu:diva-168608 (URN)978-91-554-8279-4 (ISBN)
Public defence
2012-03-30, Polhemsalen, Ångström laboratoriet, Lägerhyddsvägen 1, Uppsala, 09:55 (English)
Available from: 2012-03-09 Created: 2012-02-13 Last updated: 2012-03-29Bibliographically approved

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