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Highly efficient plasmon-enhanced dye-sensitized solar cells through metal@oxide core-shell nanostructure
Jifa Qi1, Xiangnan Dang, Paula T Hammond
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
ACS Nano
|August 6, 2011
Summary
Localized surface plasmons from silver nanoparticles enhance dye-sensitized solar cell performance by improving light absorption and electron collection. This allows for thinner, more efficient, and cost-effective solar devices.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Dye-sensitized solar cells (DSSCs) are a promising renewable energy technology.
- Improving the efficiency and reducing the cost of DSSCs is crucial for widespread adoption.
- Localized surface plasmons (LSPs) offer a pathway to enhance light absorption in solar cells.
Purpose of the Study:
- To investigate the impact of localized surface plasmons (LSPs) from silver nanoparticles (NPs) on dye-sensitized solar cell (DSSC) performance.
- To explore the use of core-shell Ag@TiO(2) NPs for plasmon enhancement in DSSCs.
- To determine the optimal concentration of Ag@TiO(2) NPs for improved efficiency and reduced photoanode thickness.
Main Methods:
- Incorporation of core-shell Ag@TiO(2) NPs into conventional TiO(2) photoanodes.
- Fabrication of plasmon-enhanced DSSCs with varying concentrations of Ag@TiO(2) NPs.
- Characterization of DSSC performance, including power conversion efficiency and photoanode thickness.
Main Results:
- Ag NPs' LSPs significantly increase dye molecule absorption, enabling thinner photoanodes.
- The core-shell structure of Ag@TiO(2) NPs prevents photoelectron recombination and enhances NP stability.
- A 0.6 wt % addition of Ag@TiO(2) NPs boosted DSSC efficiency from 3.1% to 4.4% in thin photoanodes (1.5 μm).
- A 0.1 wt % addition improved efficiency from 7.8% to 9.0% while reducing photoanode thickness by 25%.
Conclusions:
- Plasmon-enhanced DSSCs utilizing Ag@TiO(2) NPs demonstrate improved power conversion efficiency and electron collection.
- The use of Ag@TiO(2) NPs allows for a significant reduction in material usage (up to 62%) while maintaining high efficiency.
- This approach offers a viable strategy for developing more efficient and cost-effective dye-sensitized solar cells.
