|
| 基于Pb-MOF的钙钛矿量子点CsPbI3的稳定性改善 |
| Stability improvement of CsPbI3 perovskite quantum dots based on Pb-MOF |
| 投稿时间：2024-03-06 |
| DOI：10.3969/j.issn.1005-5630.202403060036 |
| 中文关键词: Pb-MOF CsPbI3量子点 孔洞限制效应 |
| 英文关键词:Pb-MOF CsPbI3 quantum dots void-confinement effect |
| 基金项目:上海市自然科学基金 (20ZR437400) |
|
| 摘要点击次数: 904 |
| 全文下载次数: 292 |
| 中文摘要: |
| 全无机钙钛矿量子点CsPbI3拥有出色的光学性能，适用于红光的发光器件及太阳能电池领域。同时，组分原子半径相差较大，且软晶格导致卤素离子迁移，会导致CsPbI3量子点发生相变，即失效。利用铅基金属有机框架（Pb metal organic framework，Pb-MOF）作为钙钛矿中的铅源，合成CsPbI3量子点（CsPbI3@Pb-MOF-OLAMI）。结果表明，其热稳定性提升了40%，而光照稳定性在经过碘化铅（PbI2）离子源溶液的修复后，提升了15倍。这种稳定性的改善主要源于孔洞限制效应，即Pb-MOF的多孔结构阻碍或减缓卤素离子的迁移，避免或减少缺陷的形成，也就抑制了钙钛矿变性过程。该研究为改善钙钛矿量子点CsPbI3的稳定性提供了新思路。 |
| 英文摘要: |
| All-inorganic perovskite quantum dots CsPbI3 have excellent optical properties and are suitable for red light emitting diodes and solar cells. 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 CsPbI3 quantum dots. In this paper, CsPbI3 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 light stability improves by 15 times after adding the 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 CsPbI3 perovskite quantum dots. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
