Mixed lead–tin perovskite films with >7 μs charge carrier lifetimes realized by maltol post-treatment,Chemical Science

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Mixed lead–tin perovskite films with >7 μs charge carrier lifetimes realized by maltol post-treatment
Chemical Science ( IF 7.6 ) Pub Date : 2021-09-27 , DOI: 10.1039/d1sc04221a
Shuaifeng Hu ₁ , Minh Anh Truong ₁ , Kento Otsuka ₁ , Taketo Handa ₁ , Takumi Yamada ₁ , Ryosuke Nishikubo ₂ , Yasuko Iwasaki ₁ , Akinori Saeki ₂ , Richard Murdey ₁ , Yoshihiko Kanemitsu ₁ , Atsushi Wakamiya ₁

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Mixed lead–tin (Pb–Sn) halide perovskites with optimum band gaps near 1.3 eV are promising candidates for next-generation solar cells. However, the performance of solar cells fabricated with Pb–Sn perovskites is restricted by the facile oxidation of Sn(II) to Sn(IV), which induces self-doping. Maltol, a naturally occurring flavor enhancer and strong metal binding agent, was found to effectively suppress Sn(IV) formation and passivate defects in mixed Pb–Sn perovskite films. When used in combination with Sn(IV) scavenging, the maltol surface treatment led to high-quality perovskite films which showed enhanced photoluminescence intensities and charge carrier lifetimes in excess of 7 μs. The scavenging and surface treatments resulted in highly reproducible solar cell devices, with photoconversion efficiencies of up to 21.4% under AM1.5G illumination.

中文翻译：

通过麦芽酚后处理实现具有 >7 μs 电荷载流子寿命的混合铅锡钙钛矿薄膜

具有接近 1.3 eV 的最佳带隙的混合铅锡 (Pb-Sn) 卤化物钙钛矿是下一代太阳能电池的有希望的候选者。然而，用 Pb-Sn 钙钛矿制造的太阳能电池的性能受到 Sn( II )容易氧化为 Sn( IV ) 的限制，这会导致自掺杂。Maltol 是一种天然存在的风味增强剂和强金属结合剂，被发现可有效抑制混合 Pb-Sn 钙钛矿薄膜中Sn( IV ) 的形成和钝化缺陷。与Sn( IV) 清除，麦芽酚表面处理导致了高质量的钙钛矿薄膜，其显示出增强的光致发光强度和超过 7 μs 的电荷载流子寿命。清除和表面处理产生了高度可重复的太阳能电池装置，在 AM1.5G 照明下光转换效率高达 21.4%。

更新日期：2021-09-28

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