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Issue 3, 2015
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Light trapping in bendable organic solar cells using silica nanoparticle arrays

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A highly efficient light-scattering layer, composed of quasi-periodic discrete silica nanoparticles directly deposited onto polymer substrates to produce bendable organic solar cells (OSCs) with enhanced light absorption, is reported. A silica nanoparticle layer (SNL) underwent self-assembly on a highly flexible and heat-sensitive polymer at room temperature during fabrication, which employed a unique plasma-enhanced chemical vapour deposition technique. Such efficient light-scattering SNLs have not been realizable by conventional solution-based coating techniques. SNLs were optimized by precisely controlling dimensional parameters, specifically, the nanoparticle layer thickness and interparticle distance. The optimized SNL exhibited an improved transmission haze of 16.8% in the spectral range of 350–700 nm, where reduction of the total transmission was suppressed to 2%. Coating light-scattering SNLs onto polymer substrates is a promising method for improving the light harvesting abilities of OSCs by enhancing the light absorption of photoactive polymer layers. This SNL-based flexible OSC exhibited a record power conversion efficiency (PCE) of 7.4%, representing a 13% improvement, while reducing the thickness of the photoactive polymer layer by 30%.

Graphical abstract: Light trapping in bendable organic solar cells using silica nanoparticle arrays

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The article was received on 08 Apr 2014, accepted on 01 Oct 2014 and first published on 01 Oct 2014

Article type: Paper
DOI: 10.1039/C4EE01100G
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Citation: Energy Environ. Sci., 2015,8, 932-940

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    Light trapping in bendable organic solar cells using silica nanoparticle arrays

    J. Yun, W. Wang, S. M. Kim, T. Bae, S. Lee, D. Kim, G. Lee, H. Lee and M. Song, Energy Environ. Sci., 2015, 8, 932
    DOI: 10.1039/C4EE01100G

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