The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China.
School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
Angew Chem Int Ed Engl. 2023 Apr 3;62(15):e202300759. doi: 10.1002/anie.202300759. Epub 2023 Mar 2.
Low band gap tin-lead perovskite solar cells (Sn-Pb PSCs) are expected to achieve higher efficiencies than Pb-PSCs and regarded as key components of tandem PSCs. However, the realization of high efficiency is challenged by the instability of Sn and the imperfections at the charge transfer interfaces. Here, we demonstrate an efficient ideal band gap formamidinium (FA)-based Sn-Pb (FAPb Sn I ) PSC, by manipulating the buried NiO /perovskite interface with 4-hydroxyphenethyl ammonium halide (OH-PEAX, X=Cl , Br , or I ) interlayer, which exhibits fascinating functions of reducing the surface defects of the NiO hole transport layer (HTL), enhancing the perovskite film quality, and improving both the energy level matching and physical contact at the interface. The effects of different halide anions have been elaborated and a 20.53 % efficiency is obtained with OH-PEABr, which is the highest one for FA-based Sn-Pb PSCs using NiO HTLs. Moreover, the device stability is also boosted.
低带隙锡铅钙钛矿太阳能电池 (Sn-Pb PSCs) 有望比 Pb-PSCs 实现更高的效率，被认为是串联太阳能电池的关键组成部分。然而，Sn 的不稳定性和电荷转移界面的不完美性挑战了高效的实现。在这里，我们通过在 NiO/钙钛矿界面上使用 4-羟基苯乙铵卤化物 (OH-PEAX，X=Cl、Br 或 I) 层来操纵钙钛矿，展示了一种高效的理想带隙甲脒 (FA) 基 Sn-Pb (FAPbSnI) 太阳能电池，这具有减少 NiO 空穴传输层 (HTL) 表面缺陷、提高钙钛矿薄膜质量以及改善界面能级匹配和物理接触的迷人功能。详细阐述了不同卤化物阴离子的影响，并用 OH-PEABr 获得了 20.53%的效率，这是使用 NiO HTLs 的基于 FA 的 Sn-Pb 太阳能电池的最高效率。此外，器件稳定性也得到了提高。
