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Issue 20, 2017
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c-Si/n-ZnO-based flexible solar cells with silica nanoparticles as a light trapping metamaterial

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Abstract

Herein, we report the fabrication of flexible solar cells based on a crystalline p-Si/n-ZnO heterostructure for the first time. An enhancement of ∼52% in the base efficiency was achieved by the application of spherical SiO2 nanoparticles as light trapping structures on the top. The use of ZnO not only offers a facile route of synthesis, but also provides an additional advantage of large band bending, leading to notable open circuit voltage and formation of an intermediate ultra-thin barrier layer of Zn2SiO4 for minimized carrier recombination. The spherical silica nanoparticles act as nanoresonators, causing absorption hot-spots in the thin silicon absorber, along with the capability of providing wide-angle light-collection. Simulation showed, for the higher angle of incidence, that the silica nanoparticles have the ability to bend light on the same side of the normal to the incident wave-front, thereby acting as a negative index metamaterial (NIM). The flexibility and cost-effectiveness of this device can make it important for the next-generation photovoltaics and roll-to-roll electronics.

Graphical abstract: c-Si/n-ZnO-based flexible solar cells with silica nanoparticles as a light trapping metamaterial

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Publication details

The article was received on 20 Feb 2017, accepted on 10 Apr 2017 and first published on 19 Apr 2017


Article type: Paper
DOI: 10.1039/C7CP01128H
Citation: Phys. Chem. Chem. Phys., 2017,19, 12838-12844
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    c-Si/n-ZnO-based flexible solar cells with silica nanoparticles as a light trapping metamaterial

    A. B. Roy, S. Das, A. Kundu, C. Banerjee and N. Mukherjee, Phys. Chem. Chem. Phys., 2017, 19, 12838
    DOI: 10.1039/C7CP01128H

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