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Issue 9, 2015
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Broadband and ultrahigh optical haze thin films with self-aggregated alumina nanowire bundles for photovoltaic applications

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Abstract

Optical haze is one of the most important factors to be considered in the development of efficient photonic and optoelectronic devices by manipulating the light behavior. In this work, we fabricated a high optical haze film composed of self-aggregated alumina nanowire arrays and applied this novel structure to improve the energy conversion efficiency of organic photovoltaic (OPV) devices. We controlled the optical properties of films, such as total/diffuse transmittance and haze value, by changing the packing density of nanowires during the wet etching process. By optimizing the etching conditions, the nanowire bundle arrays enabled us to obtain an ultrahigh optical haze value up to ∼98% or high transmittance up to ∼96%. By simply attaching the haze film onto the front glass surface of the OPV device, we significantly elongated the optical path length in the active layer, thereby achieving an overall efficiency of 9.01% out of the bare device of 8.17%, resulting in 10.28% enhancement.

Graphical abstract: Broadband and ultrahigh optical haze thin films with self-aggregated alumina nanowire bundles for photovoltaic applications

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The article was received on 05 Jun 2015, accepted on 29 Jul 2015 and first published on 30 Jul 2015


Article type: Communication
DOI: 10.1039/C5EE01757B
Citation: Energy Environ. Sci., 2015,8, 2650-2656
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    Broadband and ultrahigh optical haze thin films with self-aggregated alumina nanowire bundles for photovoltaic applications

    G. Kang, K. Bae, M. Nam, D. Ko, K. Kim and W. J. Padilla, Energy Environ. Sci., 2015, 8, 2650
    DOI: 10.1039/C5EE01757B

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