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Nanomaterials 2018, 8(8), 626; https://doi.org/10.3390/nano8080626

Optical Study and Experimental Realization of Nanostructured Back Reflectors with Reduced Parasitic Losses for Silicon Thin Film Solar Cells

1
NOVITAS (Centre of Micro-/Nano-electronics), Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2
LPICM (Laboratory of Physics of Interfaces and Thin Films), CNRS (Centre national de la recherche scientifique), Ecole Polytechnique, Université Paris Saclay, Palaiseau 91128, France
*
Author to whom correspondence should be addressed.
Received: 2 July 2018 / Revised: 11 August 2018 / Accepted: 14 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Design and Development of Nanostructured Thin Films)
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Abstract

We study light trapping and parasitic losses in hydrogenated amorphous silicon thin film solar cells fabricated by plasma-enhanced chemical vapor deposition on nanostructured back reflectors. The back reflectors are patterned using polystyrene assisted lithography. By using O2 plasma etching of the polystyrene spheres, we managed to fabricate hexagonal nanostructured back reflectors. With the help of rigorous modeling, we study the parasitic losses in different back reflectors, non-active layers, and last but not least the light enhancement effect in the silicon absorber layer. Moreover, simulation results have been checked against experimental data. We have demonstrated hexagonal nanostructured amorphous silicon thin film solar cells with a power conversion efficiency of 7.7% and around 34.7% enhancement of the short-circuit current density, compared with planar amorphous silicon thin film solar cells. View Full-Text
Keywords: light trapping; silicon thin film; photovoltaics; polystyrene sphere assisted lithography; nanostructured back reflectors light trapping; silicon thin film; photovoltaics; polystyrene sphere assisted lithography; nanostructured back reflectors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, Z.; E, R.; Lu, C.; Prakoso, A.B.; Foldyna, M.; Khoury, R.; Bulkin, P.; Wang, J.; Chen, W.; Johnson, E.; Cabarrocas, P.R. Optical Study and Experimental Realization of Nanostructured Back Reflectors with Reduced Parasitic Losses for Silicon Thin Film Solar Cells. Nanomaterials 2018, 8, 626.

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