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      Microstructured porous ZnO thin film for increased light scattering and improved efficiency in inverted organic photovoltaics

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      Author(s)
      Nirmal, A.
      Kyaw, A. K. K.
      Sun, X. W.
      Demir, Hilmi Volkan
      Date
      2014
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      Optical Society of America
      Volume
      22
      Issue
      21
      Pages
      1412 - 1421
      Language
      English
      Type
      Article
      Item Usage Stats
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      185
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      Abstract
      Microstructured porous zinc oxide (ZnO) thin film was developed and demonstrated as an electron selective layer for enhancing light scattering and efficiency in inverted organic photovoltaics. High degree of porosity was induced and controlled in the ZnO layer by incorporation of polyethylene glycol (PEG) organic template. Scanning electron microscopy, contact angle and absorption measurements prove that the ZnO: PEG ratio of 4:1 is optimal for the best performance of porous ZnO. Ensuring sufficient pore-filling, the use of porous ZnO leads to a marked improvement in device performance compared to non-porous ZnO, with 35% increase in current density and 30% increase in efficiency. Haze factor studies indicate that the performance improvement can be primarily attributed to the improved light scattering enabled by such a highly porous structure. (C) 2014 Optical Society of America
      Keywords
      Polymer Solar-cells
      Solvent
      Devices
      Nanocrystals
      Performance
      Oxide
      Permalink
      http://hdl.handle.net/11693/12680
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.22.0A1412
      Collections
      • Department of Electrical and Electronics Engineering 4012
      • Department of Physics 2551
      • Institute of Materials Science and Nanotechnology (UNAM) 2260
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