Towards High-Efficiency Photon Trapping in Thin-Film Perovskite Solar Cells Using Etched Fractal Metadevices

Ana Bărar, Stephen Akwei Maclean, Octavian Dănilă, André D. Taylor

Research output: Contribution to journalArticlepeer-review


Reflective loss is one of the main factors contributing to power conversion efficiency limitation in thin-film perovskite solar cells. This issue has been tackled through several approaches, such as anti-reflective coatings, surface texturing, or superficial light-trapping metastructures. We report detailed simulation-based investigations on the photon trapping capabilities of a standard Methylammonium Lead Iodide (MAPbI (Formula presented.)) solar cell, with its top layer conveniently designed as a fractal metadevice, to reach a reflection value (Formula presented.) in the visible domain. Our results show that, under certain architecture configurations, reflection values below 0.1 are obtained throughout the visible domain. This represents a net improvement when compared to the 0.25 reflection yielded by a reference MAPbI (Formula presented.) having a plane surface, under identical simulation conditions. We also present the minimum architectural requirements of the metadevice by comparing it to simpler structures of the same family and performing a comparative study. Furthermore, the designed metadevice presents low power dissipation and exhibits approximately similar behavior regardless of the incident polarization angle. As a result, the proposed system is a viable candidate for being a standard requirement in obtaining high-efficiency perovskite solar cells.

Original languageEnglish (US)
Article number3934
Issue number11
StatePublished - Jun 2023


  • electromagnetic field control
  • fractal metadevices
  • light trapping structures
  • perovskite solar cells

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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