Improving Light Harvesting in Dye-Sensitized Solar Cells Using Hybrid Bimetallic Nanostructures
| Autor: | Alexander A. Puretzky, William R. Erwin, Olivia K. Hurd, Joseph A. Webb, Abdelaziz Boulesbaa, David B. Geohegan, Rizia Bardhan, Holly F. Zarick |
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| Rok vydání: | 2016 |
| Předmět: |
education.field_of_study
Materials science business.industry Exciton Population Energy conversion efficiency 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Active layer Dye-sensitized solar cell Ultrafast laser spectroscopy Optoelectronics Electrical and Electronic Engineering 0210 nano-technology education business Bimetallic strip Plasmon Biotechnology |
| Zdroj: | ACS Photonics. 3:385-394 |
| ISSN: | 2330-4022 |
| Popis: | In this work we demonstrate improved light trapping in dye-sensitized solar cells (DSSCs) with hybrid bimetallic gold core/silver shell nanostructures. Silica-coated bimetallic nanostructures (Au/Ag/SiO2 NSs) integrated in the active layer of DSSCs resulted in 7.51% power conversion efficiency relative to 5.97% for reference DSSCs, giving rise to 26% enhancement in device performance. DSSC efficiencies were governed by the particle density of Au/Ag/SiO2 NSs with best performing devices utilizing only 0.44 wt % of nanostructures. We performed transient absorption spectroscopy of DSSCs with variable concentrations of Au/Ag/SiO2 NSs and observed an increase in amplitude and decrease in lifetime with increasing particle density relative to reference. We attributed this trend to plasmon resonant energy transfer and population of the singlet excited states of the sensitizer molecules at the optimum concentration of NSs promoting enhanced exciton generation and rapid charge transfer into TiO2. |
| Databáze: | OpenAIRE |
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