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Performance Enhancement of Ultra-Thin Nanowire Array Solar Cells by Bottom Reflectivity Engineering

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
ITMO University, St. Petersburg 197101, Russia
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 184;
Received: 16 December 2019 / Revised: 18 January 2020 / Accepted: 20 January 2020 / Published: 21 January 2020
(This article belongs to the Section Nanophotonics: Characterization, Modelling, and Nanodevices)
A bottom-reflectivity-enhanced ultra-thin nanowire array solar cell is proposed and studied by 3D optoelectronic simulations. By inserting a small-index MgF2 layer between the polymer and substrate, the absorption is significantly improved over a broad wavelength range due to the strong reabsorption of light reflected at the polymer/MgF2 interface. With a 5 nm-thick MgF2 layer, the GaAs nanowire array solar cell with a height of 0.4–1 μm yields a remarkable conversion efficiency ranging from 14% to 15.6%, significantly higher than conventional structures with a much larger height. Moreover, by inserting the MgF2 layer between the substrate and a part of the nanowire, in addition to between the substrate and polymer, the absorption of substrate right below the nanowire is further suppressed, leading to an optimal efficiency of 15.9%, 18%, and 5.4% for 1 μm-high GaAs, InP, and Si nanowire solar cells, respectively. This work provides a simple and universal way to achieve low-cost high-performance nanoscale solar cells. View Full-Text
Keywords: nanowire; solar cell; bottom reflectivity; conversion efficiency nanowire; solar cell; bottom reflectivity; conversion efficiency
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Yan, X.; Liu, H.; Sibirev, N.; Zhang, X.; Ren, X. Performance Enhancement of Ultra-Thin Nanowire Array Solar Cells by Bottom Reflectivity Engineering. Nanomaterials 2020, 10, 184.

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