Improved Optics in Monolithic Perovskite/Silicon Tandem Solar Cells with a Nanocrystalline Silicon Recombination Junction

Florent Sahli*, Brett A. Kamino, Jérémie Werner, Matthias Bräuninger, Bertrand Paviet-Salomon, Loris Barraud, Raphaël Monnard, Johannes Peter Seif, Andrea Tomasi, Quentin Jeangros, Aïcha Hessler-Wyser, Stefaan De Wolf, Matthieu Despeisse, Sylvain Nicolay, Bjoern Niesen, Christophe Ballif

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

192 Scopus citations


Perovskite/silicon tandem solar cells are increasingly recognized as promi­sing candidates for next-generation photovoltaics with performance beyond the single-junction limit at potentially low production costs. Current designs for monolithic tandems rely on transparent conductive oxides as an intermediate recombination layer, which lead to optical losses and reduced shunt resistance. An improved recombination junction based on nanocrystalline silicon layers to mitigate these losses is demonstrated. When employed in monolithic perovskite/silicon heterojunction tandem cells with a planar front side, this junction is found to increase the bottom cell photocurrent by more than 1 mA cm−2. In combination with a cesium-based perovskite top cell, this leads to tandem cell power-conversion efficiencies of up to 22.7% obtained from J–V measurements and steady-state efficiencies of up to 22.0% during maximum power point tracking. Thanks to its low lateral conductivity, the nanocrystalline silicon recombination junction enables upscaling of monolithic perovskite/silicon heterojunction tandem cells, resulting in a 12.96 cm2 monolithic tandem cell with a steady-state efficiency of 18%.

Original languageEnglish (US)
Article number1701609
JournalAdvanced Energy Materials
Issue number6
StatePublished - Feb 26 2018


  • microcrystalline
  • multijunction
  • organic–inorganic perovskite
  • silicon heterojunction
  • tunnel junction

ASJC Scopus subject areas

  • General Materials Science
  • Renewable Energy, Sustainability and the Environment


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