7 May 2018 Enhancing light absorption inside CZTS solar cells using plasmonic and dielectric wire grating metasurface
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Efficiency of CZTS (Cu2ZnSnS4) based thin film solar cell has witnessed rapid increase from nearly 5.7% in 2005 to more than 9% in 2016. These enhancements made CZTS solar cell a good candidate for low cost solar cells. However, low efficiency limit this choice, therefore, enhancing generated photocurrent would enhance overall efficiency. Metasurface has attracted great interest in last decade because of its ability for reducing light reflection and increasing light transmission over wide range of electromagnetic waves spectrum. Plasmonic metasurface has many advantages for antireflective surface with minor light losses disadvantages. All dielectric metasurface is promising because light losses would minimize and give better performance over plasmonic metasurface. Our results indicate that, light coupling to CZTS solar cells could be enhanced much more than planar structure after using suggested optimum dimension, pitch, coated dielectric thickness. Role of electric and magnetic diploes excited in gold wires and Mie resonance dipoles in dielectric play important role in guiding light to CZTS substrate, through our result, we suggest method for controlling them. Using three-dimensional optical modelling based on finite element method simulation tool for all our proposed structures. For verifying our results, we compared our simulated planar CZTS solar cells with fabricated one in previous work and good matching achieved for light absorption. Integrating suggested wire grating plasmonic and dielectric wire grating metasurface with planar CZTS solar cells would enhance its overall efficiency furthermore more.
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Omar A. M. Abdelraouf, Omar A. M. Abdelraouf, Ahmed Shaker, Ahmed Shaker, Nageh K. Allam, Nageh K. Allam, "Enhancing light absorption inside CZTS solar cells using plasmonic and dielectric wire grating metasurface", Proc. SPIE 10671, Metamaterials XI, 106712K (7 May 2018); doi: 10.1117/12.2307279; https://doi.org/10.1117/12.2307279

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