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Design Synthesis and Characterization of New Hybrid Derivatives for Dye Sensitized Solar Cells (DSSCs) Based on Porphyrin Rings
Dalarna University, School of Technology and Business Studies, Energy Technology.
2015 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Sunlight is the most abundant and one of the cleanest sources of energy. Nature harnesses solar energy very efficiently via the photosynthetic process. A tremendous effort has been expended at learning from natural photosynthesis and creating artificial systems for solar energy applications based on porphyrins that are key light – absorber components of successful solar cells. Dye-sensitized solar cells (DSSCs) establish an innovative class of hybrid organic-inorganic solar cells. The device consists of a mesoporous film of titanium dioxide (TiO2) nanoparticles, coated with a dye monolayer. The role of the dye in DSSCs is similar to the role of chlorophyll in plants and its presence guarantees the sensitivity of the DSSC in the visible part of the solar spectrum, by gathering solar light and transferring the energy via electron transfer to an appropriate material to produce electricity. To date the highest solar energy to electricity conversion efficiencies have reached ~13%. The principal aim of this thesis is the synthesis and characterization of new porphyrin bioinorganic sensitizers for DSSCs. The synthesis part has used a modified synthetic approach by the Coutsolelos group that has successfully produced a new porphyrin product. The base porphyrin was prepared by the trifluoroacetic acid (TFA) catalyzed condensation following a modified procedure. The porphyrin was purified by silica gel column chromatography using dichloromethane. Metallation of porphyrin by Zn was done in the chloroform–methanol mixture followed by the chromatographic purification. The new porphyrin product was subsequently characterized with Ultraviolet – Visible (UV-VIS), Nuclear Magnetic Resonance (NMR), and Matrix Assisted Laser Desorption/Ionization Time of Flight (MALDI-TOF) spectroscopies that have verified the formation of the end product. The characterization shows that the new synthesized porphyrin has characteristics very similar to that of the porphyrin complex with the record efficiency of 13%.

Place, publisher, year, edition, pages
2015.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:du-17291OAI: oai:DiVA.org:du-17291DiVA: diva2:805812
Available from: 2015-04-16 Created: 2015-04-16

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Citation style
  • apa
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  • vancouver
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More styles
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  • en-US
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  • Other locale
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  • asciidoc
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