Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/18564
標題: Design and analysis of the Equivalent circuit for Electrochemical Impedance of Dye sensitized Solar cells.
作者: 巴黛芬
Balasubramaniam, Parvathy devi
關鍵字: DSSC
TiO2 & ZnO
EIS
出版社: 應用數學系所
摘要: The initial studies of my thesis focus on the fabrication of dye-sensitized solar cells based on TiO2 and ZnO. DSSCs comprise an electrode consisting of a Nano crystalline titanium dioxide (TiO2) modified with a dye and applied to an F-doped SnO2 glass substrate; a counter electrode consisting of another F-doped SnO2 glass substrate coated with a thin Pt layer; and between the electrodes an electrolyte solution with a dissolved iodide ion/tri-iodide ion (I_/I3_) redox couple, we obtained the overall energy conversion efficiency of 5.45% under sun illumination for TiO2 DSSCs. Then I prepared ZnO Nanoparticles DSSC, we obtained the overall energy conversion efficiency of 1.35% under sun illumination and their efficiency on different dyes are compared. The second part of my present work focuses on an improved method to estimate the equivalent circuit parameters for the dye-sensitized solar cells (DSSCs). The aim of this work is to introduce the electrochemical impedance data explanation by equivalent electrical circuits. It is founded that, several different groups of values of equivalent circuit parameters can fit well to the same experiment-measured impedance data. Internal resistance depends upon the resistance element in the circuit. Internal resistance of the solar cell increases, when Fill Factor decreases.
The initial studies of my thesis focus on the fabrication of dye-sensitized solar cells based on TiO2 and ZnO. DSSCs comprise an electrode consisting of a Nano crystalline titanium dioxide (TiO2) modified with a dye and applied to an F-doped SnO2 glass substrate; a counter electrode consisting of another F-doped SnO2 glass substrate coated with a thin Pt layer; and between the electrodes an electrolyte solution with a dissolved iodide ion/tri-iodide ion (I_/I3_) redox couple, we obtained the overall energy conversion efficiency of 5.45% under sun illumination for TiO2 DSSCs. Then I prepared ZnO Nanoparticles DSSC, we obtained the overall energy conversion efficiency of 1.35% under sun illumination and their efficiency on different dyes are compared. The second part of my present work focuses on an improved method to estimate the equivalent circuit parameters for the dye-sensitized solar cells (DSSCs). The aim of this work is to introduce the electrochemical impedance data explanation by equivalent electrical circuits. It is founded that, several different groups of values of equivalent circuit parameters can fit well to the same experiment-measured impedance data. Internal resistance depends upon the resistance element in the circuit. Internal resistance of the solar cell increases, when Fill Factor decreases.
URI: http://hdl.handle.net/11455/18564
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