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Photonics 2017, 4(4), 50; https://doi.org/10.3390/photonics4040050

Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

1
Department of Physics, University of North Texas, Denton, TX 76203, USA
2
ECE Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
3
Department of Electrical Engineering, University of North Texas, Denton, TX 76203, USA
*
Author to whom correspondence should be addressed.
Received: 7 December 2017 / Revised: 17 December 2017 / Accepted: 18 December 2017 / Published: 20 December 2017
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Abstract

Light-trapping enhancement in newly discovered graded photonic super-crystals (GPSCs) with dual periodicity and dual basis is herein explored for the first time. Broadband, wide-incident-angle, and polarization-independent light-trapping enhancement was achieved in silicon solar cells patterned with these GPSCs. These super-crystals were designed by multi-beam interference, rendering them flexible and efficient. The optical response of the patterned silicon solar cell retained Bloch-mode resonance; however, light absorption was greatly enhanced in broadband wavelengths due to the graded, complex unit super-cell nanostructures, leading to the overlap of Bloch-mode resonances. The broadband, wide-angle light coupling and trapping enhancement mechanism are understood to be due to the spatial variance of the index of refraction, and this spatial variance is due to the varying filling fraction, the dual basis, and the varying lattice constants in different directions. View Full-Text
Keywords: light trapping; photonic crystals; micro- and nano-structured materials; photovoltaic devices light trapping; photonic crystals; micro- and nano-structured materials; photovoltaic devices
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Hassan, S.; Lowell, D.; Adewole, M.; George, D.; Zhang, H.; Lin, Y. Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals. Photonics 2017, 4, 50.

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