摘要
Regulation of perovskite growth plays a critical role in the development of high-performance optoelectronic devices.However,judicious control of the grain growth for perovskite light emitting diodes is elusive due to its multiple requirements in terms of morphology,composition,and defect.Herein,we demonstrate a supramolecular dynamic coordination strategy to regulate perovskite crystallization.The combined use of crown ether and sodium trifluoroacetate can coordinate with A site and B site cations in ABX_(3) perovskite,respectively.The formation of supramolecular structure retard perovskite nucleation,while the transformation of supramolecular intermediate structure enables the release of components for slow perovskite growth.This judicious control enables a segmented growth,inducing the growth of insular nanocrystal consist of low-dimensional structure.Light emitting diode based on this perovskite film eventually brings a peak external quantum efficiency up to 23.9%,ranking among the highest efficiency achieved.The homogeneous nano-island structure also enables high-efficiency large area(1 cm^(2))device up to 21.6%,and a record high value of 13.6%for highly semi-transparent ones.
基金
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China(Nos.61935016,92056119,22175118,62288102,62274135)
National Key Research and Development Program of China(under Grants No.2021YFA0715502)
Double First-Class Initiative Fund of ShanghaiTech University,and the Science and Technology Commission of Shanghai Municipality(Nos.20XD1402500 and 20JC1415800)
Bertil och Britt Svenssons Stiftelse and Swedish Energy Agency(P2022-00394)
The authors appreciate the Instrument Analysis Center and Centre for High-resolution Electron Microscopy(CħEM)and the high-performance computing(HPC)Platform of ShanghaiTech University.The authors gratefully thank professor John A.McGuire for the helpful discussion.
