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Self-Cleaning Microcavity Array for Photovoltaic Modules.

Felix Vüllers1, Benjamin Fritz2, Aiman Roslizar1

  • 1Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

ACS Applied Materials & Interfaces
|December 30, 2017
PubMed
Summary
This summary is machine-generated.

New self-cleaning coatings for photovoltaic (PV) modules improve solar cell efficiency. These superhydrophobic films reduce soiling, lowering operational costs and boosting electrical output by enhancing light absorption.

Keywords:
antisoilingmicrostructuredphotovoltaicsself-cleaningsolar cellssuperhydrophobic

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Area of Science:

  • Materials Science
  • Renewable Energy Engineering

Background:

  • Soiling of photovoltaic (PV) modules significantly reduces energy output and increases operational costs.
  • Development of effective self-cleaning coatings is crucial for the PV industry.

Purpose of the Study:

  • To fabricate and characterize flexible polymeric films with microcavity array (MCA) topography for self-cleaning and enhanced light incoupling in PV devices.

Main Methods:

  • Fabrication of fluorinated ethylene propylene (FEP) films with disordered MCA topography using hot embossing.
  • Characterization of surface properties, including superhydrophobicity (water contact angles >150°, roll-off angles <5°).
  • Optical and electrical performance testing of PV cells coated with FEP MCA films.

Main Results:

  • The FEP MCA films exhibit superhydrophobic properties, enabling self-cleaning of contaminants (30-900 μm) at tilt angles as low as 10°.
  • Impacts from water droplets at high velocities (rain-like) do not degrade the surface wetting properties.
  • The MCA topography enhances light incoupling, leading to a 4.6% increase in the electrical output of multicrystalline silicon solar cells.

Conclusions:

  • Novel FEP MCA films offer effective self-cleaning properties, reducing PV module maintenance and improving performance.
  • The enhanced light incoupling provided by the MCA topography further boosts solar cell efficiency.
  • These findings present a promising solution for improving the longevity and energy yield of photovoltaic systems.