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Thin film solar cell design based on photonic crystal and diffractive grating structures
James G Mutitu1, Shouyuan Shi, Caihua Chen
1Dept of Electrical and Computer Engineering, University of Delaware, 151 Evans Hall Newark, Delaware 19716, USA. mutitu@mail.eecis.udel.edu
Optics Express
|September 17, 2008
Summary
Novel light trapping designs using photonic crystals and diffractive gratings enhance thin film solar cell performance. These innovations improve light management for more efficient solar energy conversion.
Area of Science:
- Optics and Photonics
- Materials Science
- Renewable Energy Technologies
Background:
- Thin film solar cells require advanced light management for improved efficiency.
- Existing light trapping techniques have limitations in spectral utilization and optical path length enhancement.
Purpose of the Study:
- To introduce novel light trapping designs for multi-junction thin film solar cells.
- To enhance light absorption and energy conversion efficiency through innovative optical structures.
Main Methods:
- Incorporation of one-dimensional photonic crystals as band-pass filters.
- Integration of nano-structured diffractive gratings to increase optical path length.
- Utilizing scattering matrix and particle swarm optimization for design realization.
Main Results:
- Demonstrated photonic crystal band-pass filters reflecting specific wavelengths (400-867 nm) and transmitting others (867-1800 nm).
- Nano-structured gratings effectively redirect light waves, increasing optical path length within the solar cells.
- Preliminary fabrication results indicate the feasibility of the proposed designs.
Conclusions:
- The novel light trapping designs show significant potential for enhancing the performance of thin film solar cells.
- The integration of photonic crystals and diffractive gratings offers a promising approach for next-generation solar energy devices.
- Further research and development are warranted to optimize and commercialize these advanced solar cell technologies.
