Sputtered rear electrode with broadband transparency for perovskite solar cells

Jérémie Werner*, Guy Dubuis, Arnaud Walter, Philipp Löper, Soo Jin Moon, Sylvain Nicolay, Monica Morales-Masis, Stefaan De Wolf, Bjoern Niesen, Christophe Ballif

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

228 Scopus citations


Due to their high efficiencies combined with simple and cost-effective device fabrication, perovskite solar cells are promising candidates as top cells in tandem devices. For this application, the perovskite solar cell must be highly transparent at near-infrared wavelengths such that sufficient light is transmitted to the narrow-bandgap bottom cell. We demonstrate perovskite solar cells featuring a sputtered amorphous indium zinc oxide (IZO) layer as broadband transparent rear electrode. This electrode absorbs less than 3% in the 400-1200 nm wavelength range, while having a sheet resistance of 35Ω/sq. We show over 9% efficient semitransparent perovskite solar cells with IZO sputtered directly on the sensitive organic charge transport layer. The efficiency can be raised up to 10.3% by inserting a thin molybdenum oxide buffer layer, mitigating sputter damage to the underlying organic layer. These cells show more than 60% average transmittance in the 800-1200 nm wavelength range, which makes them suitable top-cell candidates for tandem devices. Finally, we discuss the performance potential of this highly transparent rear electrode for four-terminal tandem devices.

Original languageEnglish (US)
Pages (from-to)407-413
Number of pages7
JournalSolar Energy Materials and Solar Cells
StatePublished - Jun 29 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.


  • Methylammonium lead iodide
  • Semitransparent
  • Silicon heterojunction
  • Sputter damage
  • Tandem
  • Transparent conductive oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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