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Spray-pyrolyzed vs spin-cast titania films in bilayer hybrid solar cells with a small-molecular hole transporting dye
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Hagfeldt)
Dipartimento di Chimica Fisica ed Elettrochimica, Università degli Studi di Milano.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Anders Hagfeldt)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Titania films as acceptor layer in bilayer hybrid solar cell devices were prepared by spray-pyrolysis and by spin-casting. Both preparation methods resulted in anatase titania films with similar optical and electronic properties. Spray pyrolysis resulted in dense TiO2 films grown onto the conducting glass substrates while spin-casting gave rise to titania films with a nanoporous morphology. Hybrid solar cell devices with varying layer thickness of the small molecular semiconducting dye TDCV-TPA were investigated. Devices built with spray-pyrolyzed titania substrates yielded conversion effiencies up to 0.47 %, limited by the exciton diffusion length in TDCV-TPA. Spin-cast titania substrates exhibited short circuits for devices with thin dye layer thickness but gave up to 0.6 % conversion efficiency for thicker dye layers due to the higher interfacial area for charge separation and the dye acting as an insultator.

Keyword [en]
spray-pyrolysis, spin-casting, TiO2, hybrid solar cell
National Category
Physical Chemistry
URN: urn:nbn:se:uu:diva-168480OAI: oai:DiVA.org:uu-168480DiVA: diva2:498335
Available from: 2012-02-12 Created: 2012-02-12 Last updated: 2012-09-18
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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