Formamidinium hexafluorophosphate (FAPF6) is a pseudo-halide salt used as precursor in the preparation of perovskite-based optoelectronic systems. The incorporation of Formamidinium hexafluorophosphate to the precursor solution of formamidinium lead iodide (FAPbI3) perovskites resulted in perovskite photodetectors exhibiting better stability and enhanced device performance.
Hexafluorophosphate is an anion with chemical formula of [PF6]. It is an octahedral species that imparts no color to its salts. [PF6] is isoelectronic with sulfur hexafluoride, SF6, and the hexafluorosilicate dianion, [SiF6]2, and hexafluoroantimonate [SbF6]. In this anion, phosphorus has a valence of 5. Being poorly nucleophilic, hexafluorophosphate is classified as a non-coordinating anion.
Hexafluorophosphate Applications
Practical uses of the hexafluorophosphate ion typically exploit one or more of the following properties: that it is a non-coordinating anion; that hexafluorophosphate compounds are typically soluble in organic solvents, particularly polar ones, but have low solubility in aqueous solution; or, that it has a high degree of stability, including resistance to both acidic and basic hydrolysis.
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Li, R., Peng, J., Xu, Y., Li, W., Cui, L., Li, Y., Lin, Q., 2020. Pseudohalide Additives Enhanced Perovskite Photodetectors. Advanced Optical Materials, 2001587.
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