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Building blocks of hybrid perovskites: A photoluminescence study of lead-iodide solution species.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-08-12 , DOI: 10.1002/cphc.202000479 Oleksandra Shargaieva 1 , Lena Kuske 2 , Jörg Rappich 3 , Eva Unger 1 , Norbert H Nickel 3
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-08-12 , DOI: 10.1002/cphc.202000479 Oleksandra Shargaieva 1 , Lena Kuske 2 , Jörg Rappich 3 , Eva Unger 1 , Norbert H Nickel 3
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In this work, we present a detailed investigation of the optical properties of hybrid perovskite building blocks, [PbI2+n]n−, that form in solutions of CH3NH3PbI3 and PbI2. The absorbance, photoluminescence (PL) and photoluminescence excitation (PLE) spectra of CH3NH3PbI3 and PbI2 solutions were measured in various solvents and a broad concentration range. Both CH3NH3PbI3 and PbI2 solutions exhibit absorption features attributed to [PbI3]1− and [PbI4]2− complexes. Therefore, we propose a new mechanism for the formation of polymeric polyiodide plumbates in solutions of pristine PbI2. For the first time, we show that the [PbI2+n]n− species in both solutions of CH3NH3PbI3 and PbI2 exhibit a photoluminescence peak at about 760 nm. Our findings prove that the spectroscopic properties of both CH3NH3PbI3 and PbI2 solutions are dominated by coordination complexes between Pb2+ and I−. Finally, the impact of these complexes on the properties of solid‐state perovskite semiconductors is discussed in terms of defect formation and defect tolerance.
中文翻译：
混合钙钛矿的构建块：碘化铅溶液种类的光致发光研究。
在这项工作中，我们详细研究了在 CH 3 NH 3 PbI 3和 PbI 2溶液中形成的杂化钙钛矿结构单元 [PbI 2+n ] n−的光学性质。在各种溶剂和宽浓度范围内测量了CH 3 NH 3 PbI 3和PbI 2溶液的吸光度、光致发光（PL）和光致发光激发（PLE）光谱。CH 3 NH 3 PbI 3和PbI 2溶液均表现出归因于[PbI 3 ] 1−和[PbI 4 ] 2−络合物的吸收特征。因此，我们提出了一种在原始 PbI 2溶液中形成聚合聚碘化铅酸盐的新机制。我们首次证明CH 3 NH 3 PbI 3和PbI 2溶液中的[PbI 2+n ] n−物质在约760 nm处表现出光致发光峰。我们的研究结果证明CH 3 NH 3 PbI 3和PbI 2溶液的光谱性质均由Pb 2+和I -之间的配位络合物主导。最后，从缺陷形成和缺陷容限的角度讨论了这些配合物对固态钙钛矿半导体性能的影响。
更新日期：2020-10-19
中文翻译：
混合钙钛矿的构建块：碘化铅溶液种类的光致发光研究。
在这项工作中，我们详细研究了在 CH 3 NH 3 PbI 3和 PbI 2溶液中形成的杂化钙钛矿结构单元 [PbI 2+n ] n−的光学性质。在各种溶剂和宽浓度范围内测量了CH 3 NH 3 PbI 3和PbI 2溶液的吸光度、光致发光（PL）和光致发光激发（PLE）光谱。CH 3 NH 3 PbI 3和PbI 2溶液均表现出归因于[PbI 3 ] 1−和[PbI 4 ] 2−络合物的吸收特征。因此，我们提出了一种在原始 PbI 2溶液中形成聚合聚碘化铅酸盐的新机制。我们首次证明CH 3 NH 3 PbI 3和PbI 2溶液中的[PbI 2+n ] n−物质在约760 nm处表现出光致发光峰。我们的研究结果证明CH 3 NH 3 PbI 3和PbI 2溶液的光谱性质均由Pb 2+和I -之间的配位络合物主导。最后，从缺陷形成和缺陷容限的角度讨论了这些配合物对固态钙钛矿半导体性能的影响。
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