Study of TiO2/SiO2 Composite Film Photoelectrode and High Catalytic Pt Counter Electrode in Flexible Dye Sensitized Solar Cells
| Autor: | Siou-Yu Jhang, 張修瑜 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 The purpose of this thesis is to investigate using titanium metal substrate as photoelectrode and using conductive plastic substrate as counter electrode to fabricate flexible dye sensitized solar cells (DSSCs), in the manufacturing process due to the titanium metal substrate was opaqueness, DSSCs must be driven by back-illuminated, incident light would be loss through entering the platinum counter electrode and electrolyte solution arrival photoelectrode, so this thesis is divided into two parts to improve the utilization of incident light. The first part of this thesis is adding scattering layer to photoelectrode, we synthesized 20 nm anatase titanium dioxide nano partical (PAa101) as the active layer, then synthesized 270 nm Core/shell SiO2/TiO2 nano partical (CSST) as the scattering layer, which could use between SiO2 and TiO2 different refractive index of light, increased light walking path in order to stimulate more dye molecules, the present study investigated the effects of different layers of the scattering layer in a fixed condition four layers of film for photoelectrode. From the experimental results that the photoelectrode screen-printed one scattering layers, three layers of active layers had the best preparation condition, compared without addition scattering layer which increased the current density from 20.31 mA/cm2 to 21.60 mA/cm2, resulting an overall efficiency increased from 9.26% to 10.43%. The second part of this thesis is mainly focused on the Sputter deposition and Chemical reduction fabrication for flexible platinum counter electrode. In this stage, the flexible DSSCs was made from titanium metal based photoelectrode and conductive plastic based platinum counter electrode. The Chemical reduction was better than Sputter deposition to preparation flexible counter electrode which light transmittance increased from 82.0% to 84.2%, the difference of I3- redox potential could be reduced from 0.448V to 0.402V, accelerated the electron transfer rate increased catalytic ability of platinum counter electrode. The final flexible DSSCs attained a current density value of 23.24 mA/cm2 and the efficiency to a best value of 11.09%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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