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

1
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
ITMO University, St. Petersburg 197101, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 184; https://doi.org/10.3390/nano10020184
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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MDPI and ACS Style

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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