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Proceedings Paper

Improving dielectric nano-resonator-based antireflection coatings for photovoltaics
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Paper Abstract

We demonstrate optical and electrical property enhancement of solar cells using a variety of dielectric nano-resonator array coatings. First, we study close-packed silicon dioxide (SiO2) nano-resonator arrays on top of silicon (Si) and gallium arsenide (GaAs) solar cells. From macroscale measurements and calculations, we find that absorptivity of solar cells can be improved by 20 % due to the resonant couplings of excited whispering gallery modes and the thin-film antireflection effect. Next, we image photocurrent enhancement at the nanoscale via near-field scanning photocurrent microscopy (NSPM). Strong local photocurrent enhancement is observed over each nano-resonator at wavelengths corresponding to the whispering gallery mode excitation. Finally, for better optical coupling to solar cells, we explore hybrid nano-resonator arrays combining multiple materials such as silicon dioxide, silicon nitride, and titanium dioxide. Due to higher number of photonic modes within such hybrid coatings, absorptivity is enhanced by more than 30 % in a Si solar cell.

Paper Details

Date Published: 19 September 2018
PDF: 6 pages
Proc. SPIE 10730, Nanoengineering: Fabrication, Properties, Optics, and Devices XV, 107300A (19 September 2018); doi: 10.1117/12.2320744
Show Author Affiliations
Dongheon Ha, National Institute of Standards and Technology (United States)
Univ. of Maryland (United States)
Nikolai B. Zhitenev, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 10730:
Nanoengineering: Fabrication, Properties, Optics, and Devices XV
Balaji Panchapakesan; Anne E. Sakdinawat; André-Jean Attias; Elizabeth A. Dobisz, Editor(s)

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