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<p>Inverted perovskite solar cells face performance limitations due to non-radiative recombination at the perovskite surfaces in devices, including functional layers. Advanced characterization and density functional theory reveal that phosphonic acids passivate perovskite surface defects, while piperazinium chloride mitigates interface recombination by improving energy level alignment, introducing a field effect, and homogenizing the surface. Together, the quasi-Fermi level splitting of the perovskite is homogeneously increased by ca. 100 mV. This enables two-terminal perovskite-on-silicon tandems to achieve a certified open-circuit voltage of 2 V for a 1 cm² device and high performance in excess of 31%. The scalability of the passivation is furthermore demonstrated with homogeneously passivated devices reaching certified efficiencies of 28.9% for an active area of 60 cm².</p>

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60 cm2 perovskite-silicon tandem solar cells with an efficiency of 28.9% by homogeneous passivation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月30日

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  • Kerem Artuk,
  • Aleksandra Oranskaia,
  • Deniz Turkay,
  • Felipe Saenz,
  • Mounir D. Mensi,
  • Michele De Bastiani,
  • Andrés-Felipe Castro-Méndez,
  • Julien Hurni,
  • Christophe Allebé,
  • Mostafa Othman,
  • Lisa Champault,
  • Austin G. Kuba,
  • Alexandra Levtchenko,
  • Daniel A. Jacobs,
  • Jean-Baptiste Puel,
  • Daniel Ory,
  • Felix Lang,
  • Aïcha Hessler-Wyser,
  • Udo Schwingenschlogl,
  • Quentin Jeangros,
  • Christophe Ballif,
  • Christian M. Wolff

摘要

Inverted perovskite solar cells face performance limitations due to non-radiative recombination at the perovskite surfaces in devices, including functional layers. Advanced characterization and density functional theory reveal that phosphonic acids passivate perovskite surface defects, while piperazinium chloride mitigates interface recombination by improving energy level alignment, introducing a field effect, and homogenizing the surface. Together, the quasi-Fermi level splitting of the perovskite is homogeneously increased by ca. 100 mV. This enables two-terminal perovskite-on-silicon tandems to achieve a certified open-circuit voltage of 2 V for a 1 cm² device and high performance in excess of 31%. The scalability of the passivation is furthermore demonstrated with homogeneously passivated devices reaching certified efficiencies of 28.9% for an active area of 60 cm².