Journal
ACS PHOTONICS
Volume 3, Issue 3, Pages 385-394Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00552
Keywords
dye-sensitized solar cell; plasmon-enhanced solar cell; bimetallic nanostructures; transient absorption spectroscopy; electron dynamics
Categories
Funding
- NSF [NSF EPS1004083, EEC 1342185]
- Department of Education for a Graduate Assistance in Areas of National Need (GAANN) Fellowship [P0200A090323]
- National Science Foundation [1445197]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [GRANTS:13874832] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1263182] Funding Source: National Science Foundation
- Div Of Engineering Education and Centers
- Directorate For Engineering [1342185] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [GRANTS:13820817, 1004083] Funding Source: National Science Foundation
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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.
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