Durable all-inorganic perovskite tandem photovoltaics.
basic_science · Level V
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- Record sourced from PubMed, PMID 39608398.
- Also identified by DOI 10.1038/s41586-024-08432-7.
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Abstract
All-inorganic perovskites prepared by substituting the organic cations (for example, methylammonium and formamidinium) with inorganic cations (for example, Cs<sup>+</sup>) are effective concepts to enhance the long-term photostability and thermal stability of perovskite solar cells (PSCs)<sup>1,2</sup>. Hence, inorganic perovskite tandem solar cells (IPTSCs) are promising candidates for breaking the efficiency bottleneck and addressing the stability issue, too<sup>3,4</sup>. However, challenges remain in fabricating two-terminal (2T) IPTSCs due to the inferior film formation and deep trap states induced by tin cations<sup>5-7</sup>. Here a ligand evolution (LE) strategy with p-toluenesulfonyl hydrazide (PTSH) is used to regulate film formation and eliminate deep traps in inorganic narrow-bandgap (NBG) perovskites, enabling the successful development of 2T IPTSCs. Accordingly, the 1.31 eV CsPb<sub>0.4</sub>Sn<sub>0.6</sub>I<sub>3</sub>:LE device delivers a record efficiency of 17.41%. Combined with the 1.92 eV CsPbI<sub>2</sub>Br top cell, 2T IPTSCs exhibit a champion efficiency of 22.57% (certified, 21.92%). Moreover, IPTSCs are engineered to deliver remarkable durability under maximum power point (MPP) tracking, maintaining 80% of their initial efficiency at 65 °C for 1,510 h and at 85 °C for 800 h. We elucidate that LE deliberately leverages multiple roles for inorganic NBG perovskite growth and anticipate that our study provides an insightful guideline for developing high-efficiency and stable IPTSCs.