Hu Shuaifeng, Truong Minh Anh, Otsuka Kento, Handa Taketo, Yamada Takumi, Nishikubo Ryosuke, Iwasaki Yasuko, Saeki Akinori, Murdey Richard, Kanemitsu Yoshihiko, Wakamiya Atsushi
Institute for Chemical Research, Kyoto University Gokasho, Uji Kyoto 611-0011 Japan
Department of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita Osaka 565-0871 Japan.
Chem Sci. 2021 Sep 27;12(40):13513-13519. doi: 10.1039/d1sc04221a. eCollection 2021 Oct 20.
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.
具有接近1.3 eV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前途的候选材料。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。麦芽酚是一种天然存在的风味增强剂和强金属结合剂，被发现可以有效抑制混合Pb-Sn钙钛矿薄膜中Sn（iv）的形成并钝化缺陷。当与Sn（iv）清除剂结合使用时，麦芽酚表面处理产生了高质量的钙钛矿薄膜，其光致发光强度增强，电荷载流子寿命超过7 μs。清除和表面处理产生了高度可重复的太阳能电池器件，在AM1.5G光照下光转换效率高达21.4%。
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