Self‐Organized Small Molecules in Robust MOFs for High‐Performance Perovskite Solar Cells with Enhanced Degradation Activation Energy

作者：Jiaqi Wang, Jian Zhang, Shuang Gai, Wei Wang, Yayu Dong, Boyuan Hu, Jiao Li, Kaifeng Lin, Debin Xia, Ruiqing Fan, Yulin Yang · 发表于：Advanced Functional Materials · 年份：2022 · DOI：10.1002/adfm.202203898 · 被引用次数：55 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic and Molecular Conductors Research

Abstract A brand new strategy to improve the volatility and disordered arrangement of small organic molecule additives within doped perovskite solar cells through the construction of metal–organic frameworks (MOFs) is proposed. The Zn‐TTB, self‐assembling from Zn 2+ and 1‐(triazol‐1‐ly)‐4‐tetrazol‐5‐ylmethyl)benzene (TTB), inherits and arranges triazole and tetrazole groups and forms a long‐chain structure surrounding metal nodes. The perovskite precursors grow along with the skeleton of Zn‐TTB and produce a macromolecular intermediate phase via the MOFs‐perovskite interconnection, subsequently forming superior perovskite films with enhanced stability with respect to molecular additives, as evidenced by in situ thermogravimetry‐Fourier transform infrared spectroscopy measurements. Thermal analyses suggest MOF‐doping increases degradation activation energies by up to >174.01 kJ mol –1 compared to the reference sample (162.45 kJ mol –1 ). Zn‐TTB‐modified devices exhibit promising efficiencies (up to 23.14%) and operational stability in unencapsulated state, even under constant solar light illumination.