Nano-photonic light trapping near the Lambertian limit in organic solar cell architectures
| Autor: | Erik Timmons, Rana Biswas |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Theory of solar cells
Materials science Organic solar cell business.industry Hybrid solar cell Quantum dot solar cell Solar energy Atomic and Molecular Physics and Optics Polymer solar cell Multiple exciton generation Optics Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Optoelectronics Astrophysics::Earth and Planetary Astrophysics Plasmonic solar cell business |
| Zdroj: | Optics Express. 21:A841 |
| ISSN: | 1094-4087 |
| Popis: | A critical step to achieving higher efficiency solar cells is the broad band harvesting of solar photons. Although considerable progress has recently been achieved in improving the power conversion efficiency of organic solar cells, these cells still do not absorb upto ~50% of the solar spectrum. We have designed and developed an organic solar cell architecture that can boost the absorption of photons by 40% and the photo-current by 50% for organic P3HT-PCBM absorber layers of typical device thicknesses. Our solar cell architecture is based on all layers of the solar cell being patterned in a conformal two-dimensionally periodic photonic crystal architecture. This results in very strong diffraction of photons- that increases the photon path length in the absorber layer, and plasmonic light concentration near the patterned organic-metal cathode interface. The absorption approaches the Lambertian limit. The simulations utilize a rigorous scattering matrix approach and provide bounds of the fundamental limits of nano-photonic light absorption in periodically textured organic solar cells. This solar cell architecture has the potential to increase the power conversion efficiency to 10% for single band gap organic solar cells utilizing long-wavelength absorbers. |
| Databáze: | OpenAIRE |
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