FA2PbBr4: Synthesis, Structure, and Unusual Optical Properties of Two Polymorphs of Formamidinium-Based Layered (110) Hybrid Perovskite

  title={FA2PbBr4: Synthesis, Structure, and Unusual Optical Properties of Two Polymorphs of Formamidinium-Based Layered (110) Hybrid Perovskite},
  author={S. A. Fateev and Andrey A. Petrov and Ekaterina I. Marchenko and Yan V. Zubavichus and Victor N. Khrustalev and Andrey V. Petrov and Sergey M. Aksenov and Eugene A. Goodilin and Alexey B. Tarasov},
Small cations such as guanidinium and cesium can act as templating cations to form low dimensional phases (2D, 1D, 0D) in the case of excess of organic halides. However, such phases with the widely used formamidinium (FA) cation have not been reported so far. In this study, we discovered two novel low dimensional phases with composition of FA2PbBr4 and investigated the prerequisites of their formation upon crystallization of FABr-excessive solutions of FAPbBr3. We found that both phases have… 

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