Ultra-Broadband Directional Scattering by Colloidally Lithographed High-Index Mie Resonant Oligomers and Their Energy-Harvesting Applications

Zhang, Y, Xu, Y, Chen, S, Lu, H, Chen, K, Cao, Y, Miroshnichenko, A, Gu, M and Li, X 2018, 'Ultra-Broadband Directional Scattering by Colloidally Lithographed High-Index Mie Resonant Oligomers and Their Energy-Harvesting Applications', ACS Applied Materials and Interfaces, vol. 10, no. 19, pp. 16776-16782.


Document type: Journal Article
Collection: Journal Articles

Title Ultra-Broadband Directional Scattering by Colloidally Lithographed High-Index Mie Resonant Oligomers and Their Energy-Harvesting Applications
Author(s) Zhang, Y
Xu, Y
Chen, S
Lu, H
Chen, K
Cao, Y
Miroshnichenko, A
Gu, M
Li, X
Year 2018
Journal name ACS Applied Materials and Interfaces
Volume number 10
Issue number 19
Start page 16776
End page 16782
Total pages 7
Publisher American Chemical Society
Abstract Emerging high-index all-dielectric nanostructures, capable of manipulating light on the subwavelength scale, empower designing and implementing novel antireflection and light-trapping layers in many photonic and optoelectronic devices. However, their performance and practicality are compromised by relatively narrow bandwidths and highly sophisticated fabrications. In this paper, we demonstrate an ultra-broadband (300-1200 nm) directional light scattering strategy using high-index surface silicon oligomer resonators fabricated by a facile, scalable, and low-cost colloidal lithography technique. The exceptional broadband forward scattering stems from a combined effect of strongly intercoupled Mie resonances within the oligomers composed of randomly positioned nanodisks in the visible region and a strong electric mode coupling between the oligomers and the high-index substrate in the red-to-near-infrared region. By implementing this efficient approach in silicon solar cells, the integrated optical reflection loss across the wavelength range 300-1200 nm can be as low as 7%. Consequently, the short-circuit current density determined from the external quantum efficiency of solar cells can be increased to 35.1 from 25.1 mA/cm2, representing an enhancement of 40%, with a demonstrated energy conversion efficiency exceeding 15.0%. The insights in this paper hold great potentials for new classes of light management and steering photonic devices with drastically improved practicality.
Subject Classical and Physical Optics
Keyword(s) antireflection
directional scattering
light trapping
Mie resonance
solar energy
DOI - identifier 10.1021/acsami.8b03718
Copyright notice © 2018 American Chemical Society.
ISSN 1944-8244
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