Research progress of hybrid tin-lead narrow-bandgap perovskites for single-junction and all-perovskite tandem solar cells

• Organic-inorganic metal halide perovskites have attracted extensive attention for applications in photovoltaics (PV) due to their superior optoelectronic properties and unprecedented performance development. For single-junction PV devices, although the efficiency of lead-based perovskite solar cells (PSCs) has reached 26.1%, hybrid tin-lead (Sn-Pb) perovskites offer more desirable bandgap tuning capabilities, leading to higher performance.

  
  

  Sn-Pb perovskites (bandgap tuned to about 1.2 eV) are also attractive as bottom subcells in tandem structures to further surpass the Shockley-Queisser radiative limit of single-junction devices. The performance of all-perovskite tandem solar cells has been rapidly improved, with certified efficiencies as high as 29.1%.

  
  

  Kai Zhu et al. from the National Renewable Energy Laboratory of the United States reviewed the properties and recent progress of novel hybrid Sn-Pb perovskites and their applications in single-junction and all-perovskite tandem solar cells. We highlighted the latest progress in various approaches, including additives, solvents, interfaces, and perovskite growth. We also provided an outlook and perspective on the challenges and strategies for further developing hybrid Sn-Pb perovskites in terms of efficiency and stability for photovoltaic applications.

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• F. Yang, K. Zhu, Advances in Mixed Tin-Lead Narrow-Bandgap Perovskites for Single-Junction and All-Perovskite Tandem Solar Cells. Adv. Mater. 2024, 2314341.

  
  

  https://doi.org/10.1002/adma.202314341