钙钛矿晶格重构实现高亮度、卓越的颜色稳定性及低效率滚降的混合卤化物蓝色钙钛矿发光二极管
Lattice reconstruction for mixed-halide blue perovskite light-emitting diodes with high brightness,outstanding color stability and low efficiency roll-off
吴炯桦 1王仁杰 2张睿 3Giuseppe Portale 4Eduardo Solano 5刘小可 3高峰3
作者信息
- 1. Department of Physics,Chemistry and Biology(IFM),Linköping University,Linköping,581 83,Sweden;College of Physics and Information Engineering,Institute of Micro-Nano Devices and Solar Cells,Fuzhou University,Fuzhou 350108,China
- 2. College of Physics and Information Engineering,Institute of Micro-Nano Devices and Solar Cells,Fuzhou University,Fuzhou 350108,China
- 3. Department of Physics,Chemistry and Biology(IFM),Linköping University,Linköping,581 83,Sweden
- 4. Zernike Institute for Advanced Materials,University of Groningen,Nijenborgh 4,Groningen,9747AG,Netherlands
- 5. Experiments Division ALBA synchrotron Carrer de la Llum 2-2608290-Cerdanyola del Vallès,Barcelona,Spain
- 折叠
摘要
本文展示了一种简单、有效且通用的晶格重构方法,利用具有高古特曼供体数(DNs)的非极性溶剂来提高钙钛矿薄膜的质量.我们发现高DN非极性溶剂,例如乙酸乙酯,可以与钙钛矿前驱体相互作用.这种溶剂可以使钙钛矿晶格更加有序和"更坚硬",并促使钙钛矿表面形成一种2D/3D的钙钛矿异质结构.晶格重构的钙钛矿薄膜表现出较低的缺陷密度并且其钙钛矿离子迁移受到了抑制.最终得到的混合卤化物蓝色钙钛矿发光二极管(PeLEDs)显示出极高的驱动电流密度和电压的耐受性,表现出高亮度和卓越的颜色稳定性.我们的工作深入研究了非极性溶剂与钙钛矿相互作用,并为进一步开发高性能的PeLEDs提供了启发.
Abstract
We report a simple,effective,and universal lattice reconstruction approach to improve the quality of perovskite films by using nonpolar solvents with high Gut-mann donor numbers(DNs).We find that high-DN nonpolar solvents,for instance,ethyl acetate,can interact with per-ovskite precursors.Such a solvent can make the perovskite lattice more ordered and"harder"and promote the formation of heterostructures with low-dimensional perovskite im-purities and residual solvent molecules.As a result,the lattice-reconstructed perovskite films exhibit reduced defect densities and suppressed ion migration.The resultant mixed-halide blue perovskite light-emitting diodes(PeLEDs)show greatly enhanced tolerance to high driving current densities and vol-tages,demonstrating high brightness,outstanding color sta-bility and low efficiency roll-off.Our work provides a deep understanding of the interactions between nonpolar solvents and perovskites and offers useful guidelines for further de-velopment of high-power PeLEDs.
关键词
color stability/mixed halide perovskite/low effi-ciency roll-off/high brightness/ion migrationKey words
color stability/mixed halide perovskite/low effi-ciency roll-off/high brightness/ion migration引用本文复制引用
出版年
2024
NETL
NSTL
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