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  • Title: Black silicon solar thin-film microcells integrating top nanocone structures for broadband and omnidirectional light-trapping.
    Author: Xu Z, Yao Y, Brueckner EP, Li L, Jiang J, Nuzzo RG, Liu GL.
    Journal: Nanotechnology; 2014 Aug 01; 25(30):305301. PubMed ID: 25006119.
    Abstract:
    Recently developed classes of monocrystalline silicon solar microcells (μ-cell) can be assembled into modules with characteristics (i.e., mechanically flexible forms, compact concentrator designs, and high-voltage outputs) that would be impossible to achieve using conventional, wafer-based approaches. In this paper, we describe a highly dense, uniform and non-periodic nanocone forest structure of black silicon (bSi) created on optically-thin (30 μm) μ-cells for broadband and omnidirectional light-trapping with a lithography-free and high-throughput plasma texturizing process. With optimized plasma etching conditions and a silicon nitride passivation layer, black silicon μ-cells, when embedded in a polymer waveguiding layer, display dramatic increases of as much as 65.7% in short circuit current, as compared to a bare silicon device. The conversion efficiency increases from 8.1% to 11.5% with a small drop in open circuit voltage and fill factor.
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