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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
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Photon energy upconversion through thermal radiation with the power efficiency reaching 16%
Junxin Wang1, Tian Ming1, Zhao Jin1
1Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.
Nature Communications
|November 29, 2014
Summary
Photon energy upconversion using thermal radiation offers higher efficiencies than traditional methods for solar energy applications. This research demonstrates a 16% efficiency using Yb(3+)-doped ZrO2, paving the way for improved solar cells.
Area of Science:
- Materials Science
- Photonics
- Renewable Energy
Background:
- Solar energy conversion is hindered by poor response to low-energy photons.
- Photon energy upconversion is crucial for enhancing solar energy technologies.
Purpose of the Study:
- To explore thermal radiation as a novel route for photon energy upconversion.
- To identify material properties that optimize upconversion efficiency.
Main Methods:
- Investigated Yb(3+)-doped ZrO2 for photon energy upconversion.
- Tested various oxide samples doped with lanthanide or transition metal ions.
- Evaluated upconversion under concentrated sunlight and laser excitation.
Main Results:
- Achieved a maximal power upconversion efficiency of 16% using Yb(3+)-doped ZrO2.
- Identified high melting point, low thermal conductivity, and strong infrared absorption as key material properties.
- Demonstrated upconverted light generation for Si solar cell electricity production.
Conclusions:
- Thermal radiation is an efficient method for photon energy upconversion.
- Material selection guidelines were established for high upconversion performance.
- The approach is feasible for practical solar energy conversion and device operation.
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