articleScienceDec 10, 2020GREEN OA

Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

AAAmran Al‐AshouriEKEike KöhnenBLBor LiAMArtiom MagomedovHHHannes Hempel

Helmholtz-Zentrum Berlin für Materialien und Energie · Kaunas University of Technology · +7 more institutions

PubMed
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Abstract

Tandem solar cells that pair silicon with a metal halide perovskite are a promising option for surpassing the single-cell efficiency limit. We report a monolithic perovskite/silicon tandem with a certified power conversion efficiency of 29.15%. The perovskite absorber, with a bandgap of 1.68 electron volts, remained phase-stable under illumination through a combination of fast hole extraction and minimized nonradiative recombination at the hole-selective interface. These features were made possible by a self-assembled, methyl-substituted carbazole monolayer as the hole-selective layer in the perovskite cell. The accelerated hole extraction was linked to a low ideality factor of 1.26 and single-junction fill…

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Topics & keywords

Topics
Keywords
  • Tandem
  • Perovskite (structure)
  • Silicon
  • Extraction (chemistry)
  • Materials science
  • Perovskite solar cell
  • Solar cell
  • Silicon solar cell
UN Sustainable Development Goals
  • Affordable and clean energy
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