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Bridging Oxidation and Crystallization Pathways in Sn-Pb Perovskites for High-Efficiency, Stable Solar Cells.

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Mixed tin-lead perovskites are key for efficient all-perovskite tandem solar cells (TSCs). This review addresses their stability challenges, focusing on tin oxidation and crystallization, to enable commercialization.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • All-perovskite tandem solar cells (TSCs) are emerging as a promising photovoltaic technology, with efficiencies exceeding 30%.
  • Mixed tin-lead (Sn-Pb) perovskites are crucial narrow-bandgap absorbers for high-efficiency TSCs due to their optimal bandgap, reduced lead content, and solution processability.
  • Significant stability issues, particularly Sn2+ oxidation and crystallization mismatch, impede the widespread adoption of Sn-Pb perovskite solar cells.

Purpose of the Study:

  • To provide an integrated framework addressing the fundamental stability bottlenecks of Sn-Pb perovskites.
  • To link mechanistic insights of Sn2+ oxidation and Sn/Pb crystallization mismatch across different stages of perovskite solar cell development.
  • To summarize recent advancements and outline future directions for achieving scalable and commercially viable stability solutions for Sn-Pb perovskite TSCs.

Main Methods:

  • Review of recent scientific literature focusing on Sn-Pb perovskite chemistry, thin-film formation, and device operation.
  • Analysis of mechanistic insights into Sn2+ oxidation and Sn/Pb crystallization mismatch.
  • Synthesis of data on recent advances enabling high efficiency and operational stability.

Main Results:

  • Recent advances have enabled Sn-Pb perovskite solar cells with power conversion efficiencies exceeding 23%.
  • Thousand-hour operational stability has been achieved for these advanced Sn-Pb perovskite devices.
  • An integrated framework linking precursor chemistry, thin-film formation, and device operation has been developed to understand stability issues.

Conclusions:

  • Addressing Sn2+ oxidation and Sn/Pb crystallization mismatch is critical for the commercialization of Sn-Pb perovskite TSCs.
  • Continued research focusing on integrated stability solutions is essential for scalable and reliable perovskite photovoltaics.
  • Future directions involve developing fully integrated, scalable, and commercially relevant stability solutions for next-generation solar cells.