TitleDye sensitized solar cells with templated TiO2 coatings
NamePhadke, Sarika A. (author), Birnie,III, Dr. Dunbar (chair), Haber, Dr. Richard (internal member), Klein, Dr. Lisa (internal member), Guiheen, Dr. James (outside member), Rutgers University, Graduate School - New Brunswick,
SubjectMaterials Science and Engineering,
Dye-sensitized solar cells
DescriptionPhotovoltaic (PV) technology can make a significant contribution in energy production if it becomes more economical and technologically more competitive with other renewable and conventional energy sources. Dye sensitized solar cell (DSSC) is a third generation PV technology which utilizes easily available raw material and low cost manufacturing methods. The performance of the DSSC technology is not yet at par with the existing crystalline silicon and thin film based photovoltaic technologies. Therefore to realize the real potential of DSSC, fundamental research in understanding the device physics and identifying the most promising cell material and configuration is necessary. This research focuses on the titanium dioxide coating, which is used as the photoanode in the DSSC. The titania coating transfers the electrons injected from the adsorbed dye to the electrode. For efficient regeneration of the dye, the redox electrolyte present in between the two electrodes of the cell has to be in intimate contact with the titania nanoparticles. This requires the titania coating to contain interpenetrating network of meso and macro pores. The present research employs sacrificial templating technique to incorporate porosity into the titania coating. Oil in water emulsions have been primarily used as the templating material and they provide a very cost effective and simple way to produce the porous coatings. Different commercial techniques have been used to produce the emulsion templated titania coatings such as blade coating, spin coating and roll to roll coating. Their microstructures were analyzed and compared in detail. Mercury porosimetry and BET surface area measurements were also employed to characterize the pore size distribution and surface area of the emulsion templated coatings. To understand the effect of the added porosity on the internal resistances and kinetics of the TiO2/dye/electrolyte interface, electrochemical impedance spectroscopic (EIS) analysis was performed. EIS analysis showed that the templated coatings had lower impedances and they provided faster diffusion of ionic species through the titania coating. The current-voltage characterization of the emulsion templated dye sensitized solar cells showed an increase in the photocurrent and photovoltage as compared to the nontemplated cells. Cells templated with the 20 wt% oil in water emulsion had twice the efficiency as compared to the non-templated solar cells.
NoteIncludes bibliographical references
Noteby Sarika A. Phadke
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.