Surface Treatment Agent for High Quality Sn-Pb Perovskite Thin Films

Maltol, known as a flavor enhancer, has a bidentate chelating site. Because of the noteworthy metal chelating ability of maltol, a fabrication method of high-quality Sn-Pb perovskite thin films by surface treatment with maltol solution was reported. ¹⁾ Sn-Pb perovskite has attracted attention as a promising material for solar cells with the near-infrared band gap, however the defects caused by oxidation of Sn(II) degrade performance.²⁾ On the other hand, maltol forms a stable complex with Sn(II), which suppresses oxidation of Sn(II) and reduces the density of defects at the perovskite film surface. Maltol-treated Sn-Pb perovskite thin film showed a long photoluminescence lifetime of 7.4 μs compared to 3.7 μs for untreated films in terms of time-resolved fluorescence measurement. The high-power conversion efficiency of 21.4% (J_SC = 33.1 mA/cm², V_OC = 0.82 V, FF = 0.79) was achieved for these maltol-treated perovskite solar cells.

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References

• 1) Mixed lead–tin perovskite films with >7 μs charge carrier lifetimes realized by maltol post-treatment
  • S. Hu, M. A. Truong, K. Otsuka, T. Handa, T. Yamada, R. Nishikubo, Y. Iwasaki, A. Saeki, R. Murdey, Y. Kanemitsu, A. Wakamiya, Chem. Sci. 2021, 12, 13513.
• 2) Optoelectronic Properties of Tin–Lead Halide Perovskites
  • K. J. Savill, A. M. Ulatowski, L. M. Herz, ACS Energy Lett. 2021, 6, 2413.

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