Solar cells based on synthesized nanocrystalline ZnO thin films sensitized by chlorophyll a and photopigments isolated from spinach
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
The principles of dye-sensitized solar cells were studied and are outlined in this thesis. An overview of the basic steps needed to create a DSC isfollowed by detailed experimental information on how to assemble the solar cells that were fabricated in this project. They were based on synthesizednanocrystalline ZnO thin films sensitized by chlorophyll a as well as isolated photopigments from spinach leaves. The nanocrystals werestudied using XRD, and it was confirmed that three different methods of synthesis resulted in ZnO crystals of a few nanometers. The solar cellswere assembled with Au electrodes in a sandwich configuration and their photovoltaic properties were measured. Overall light-to-electricity conversionwas low with the highest efficiency being 0.21 %. An astonishingly low efficiency of 0.0003 % was noted for a thin film which was not thermallytreated, and it is suggested that heat-treatment is of great importance. It was also found that photopigments from spinach can be extractedeasily and used as molecular sensitizer without any demanding purification steps.
Place, publisher, year, edition, pages
2010. , 35 p.
Dye-sensitized solar cell, thin film, Au cathode, nanocrystals, mesoporous, ZnO, chlorophyll, spinach, photopigments, XRD
IdentifiersURN: urn:nbn:se:liu:diva-55032ISRN: LITH-IFM-A-EX--10/2232--SEOAI: oai:DiVA.org:liu-55032DiVA: diva2:314997
2010-03-19, Dalton, IFM, Linköpings universitet 581 83, Linköping, B-huset, 14:15 (Swedish)
UppsokPhysics, Chemistry, Mathematics
Björefors, Fredrik, Associate ProfessorJonsson, Bengt-Harald, Professor
Käll, Per-Olov, Professor