Get access

ZnO Nanorods as Antireflective Coatings for Industrial-Scale Single-Crystalline Silicon Solar Cells

Authors

  • Pantea Aurang,

    1. Department of Micro and Nanotechnology, Middle East Technical University, Ankara, Turkey
    2. Center for Solar Energy Research and Applications, Middle East Technical University, Ankara, Turkey
    Search for more papers by this author
  • Olgu Demircioglu,

    1. Department of Micro and Nanotechnology, Middle East Technical University, Ankara, Turkey
    2. Center for Solar Energy Research and Applications, Middle East Technical University, Ankara, Turkey
    Search for more papers by this author
  • Firat Es,

    1. Department of Micro and Nanotechnology, Middle East Technical University, Ankara, Turkey
    2. Center for Solar Energy Research and Applications, Middle East Technical University, Ankara, Turkey
    Search for more papers by this author
  • Rasit Turan,

    1. Department of Micro and Nanotechnology, Middle East Technical University, Ankara, Turkey
    2. Center for Solar Energy Research and Applications, Middle East Technical University, Ankara, Turkey
    3. Department of Physics, Middle East Technical University, Ankara, Turkey
    Search for more papers by this author
  • Husnu Emrah Unalan

    Corresponding author
    1. Center for Solar Energy Research and Applications, Middle East Technical University, Ankara, Turkey
    2. Department of Metallurgical and Materials Engineering, Middle East Technical University, Ankara, Turkey
    • Department of Micro and Nanotechnology, Middle East Technical University, Ankara, Turkey
    Search for more papers by this author

Author to whom correspondence should be addressed. e-mail: unalan@metu.edu.tr

Abstract

In this work, both planar and textured, industrial scale (156 mm × 156 mm) single-crystalline silicon (Si) solar cells have been fabricated using zinc oxide (ZnO) nanorods as antireflection coating (ARC). ZnO nanorods were grown in a few minutes via hydrothermal method within a commercially available microwave oven. Relative improvement in excess of 65% in the reflectivity was observed for both planar and textured Si surfaces. Through ZnO nanorods, effective lifetime (τeff) measurements were presented to investigate the surface passivation property of such an ARC layer. ZnO nanorods increased the τeff from 9 to 71 μs at a carrier injection level of 1015 cm−3. Increased carrier lifetime revealed the passivation effect of the ZnO nanorods in addition to their ARC property. 33% and 16% enhancement in the photovoltaic conversion efficiency was obtained in planar and textured single-crystalline solar cells, respectively. Our results reveal the potential of ZnO nanorods as ARC that can be deposited through simple solution-based methods and the method investigated herein can be simply adapted to industrial scale fabrication.

Ancillary