基于Pb-MOF的钙钛矿量子点 CsPbI₃ 的稳定性改善

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关键词：Pb-MOF； CsPbI3 量子点；孔洞限制效应中图分类号： 文献标志码：A

Stability improvement of CsPbI3 perovskite quantum dots based on Pb-MOF

GAO Xiaohua， XU Gongjie （School of Optical-Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China）

Abstract： All-inorganic perovskite quantum dots CsPb3 have excellent optical properties and are suitable for red light emitting diodes and solar cels. However， the large difference of their atomic radius，as well as the migration of halogen ion caused by the intrinsic soft-lattice nature， would lead to the phase transition and degradation of CsPb3 quantum dots. In this paper， CsPb3 quantum dots （CsPbI3@Pb-MOF-OLAMI） were synthesized using Pb metal organic framework（ Pb -MOF）as lead sources in perovskite. The results showed that the thermal stability improves by 40% ， and the lightstability improves by 15 times after addingthe lead iodide （PbI2） solution：This stability improvement is mainly due to the void-confinement effect. The porous structure of Pb -MOF hinders the migration of halogen ions， which avoids or reduces the formation of defects， and thus alleviates the degeneration of perovskite. This study provides a new strategy for improving the stability of CsPb3 perovskite quantum dots.

Keywords： Pb -MOF; CsPb3 quantum dots; void-confinement effect

引言

近年来，钙钛矿材料因其优异的光电性能以及在LED、光电探测器、太阳能电池、激光器等领域良好的应用前景引起了广泛关注[]。（剩余14428字）