Investigation on the influences of layer structure and nanoporosity of light scattering TiO2 layer in DSSC

6th Asian Physics Symposium

Apriani, T.^1 ; Arsyad, W.S.^1,2 ; Wulandari, P.^1 ; Hidayat, R.^1

Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, West-Java

40132, Indonesia^1

Physics Department, Faculty of Mathematics and Natural Sciences, Haluoleo University, Jl. Kampus Hijau Bumi Tridharma Anduonohu, South East Sulawesi, Kendari

93232, Indonesia^2

关键词: Different thickness;    Electrochemical impedance spectroscopy measurements;    Fabrication process;    Light-scattering layer;    Photovoltaic materials;    Power conversion efficiencies;    TiO2 nano-particles;    Transparent layers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012134/pdf
DOI  :  10.1088/1742-6596/739/1/012134

来源: IOP

【 摘 要 】

Dye-sensitized solar cell (DSSC) is one of promising photovoltaic materials due to its simplicity in fabrication process and rich variety of possible sensitizer molecules. DSSC cell is commonly constructed of TiO2layer as photoelectrode, dye as photosensitizer, electrolyte as redox mediator, and platinum layer as counter electrode. TiO2layer is often constructed from different types of layers, such as blocking layer, transparent layer, microchannel or light scattering layer, which is made usually by successive layer-by-layer process. In this work, different TiO2layers with different thickness and heat treatment were prepared and then used to build a complete sandwich-type DSSC. The characterization results show that the power conversion efficiency (PCE) is slightly reduced when using TiO2layer with multiple scattering layers. This reduction is caused by an increase in the resistance from charge transport and charge transfer inside the mesoporous TiO2layer, as revealed from the electrochemical impedance spectroscopy measurement results. Additional heat treatment introduced at the final step in the TiO2layer preparation process, however, slightly improve the cell performance. Although this heat treatment does not produce significant change in porosity or pore size distribution of the TiO2layer, it might be able to improve the contact between the TiO2nanoparticles. The best PCE achieved in this work is about 5.3%, which was observed in the cell using TiO2layer with one scattering layer and additional heat treatment.