Enhancing Performance of CsSnBr <sub>3</sub> Light‐Emitting Diodes via Synergistic Ion Doping and in Situ Interfacial Reaction
Abstract
ABSTRACT Tin‐based perovskites are among the most promising lead‐free emitters for perovskite light‐emitting diodes (PeLEDs), but their performance is severely hindered by the uncontrolled rapid crystallization and facile oxidation. Here, we report a synergistic bulk–interface strategy for enhancing performance of CsSnBr 3 PeLEDs by combining Zn 2+ bulk doping with an in situ interfacial reaction. Incorporation of ZnBr 2 suppresses Sn vacancies and residual SnBr 2 while regulating crystallization to improve film morphology. Concurrently, sodium citrate‐modified PEDOT:PSS promotes deprotonation of 6‐phosphonylhexyl acid, forming robust coordination bonds that delay crystallization and passivate defects. Benefiting from these dual effects, the optimized devices achieve a record external quantum efficiency for CsSnBr 3 PeLEDs. This work highlights the effectiveness of synergistic bulk–interface regulation in tuning crystallization kinetics, providing constructive insights for the development of efficient lead‐free perovskite optoelectronics.
Article Details
Authors (14)
Qipan Yu
National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing China
Yuhan Zhou
Department of Chemistry
Wenxiao Niu
National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing China
Jie Yang
Yangyu Liu
National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing China
Xingjiao Feng
National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing China
Yuhui Ye
National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing China
Pengpeng Teng
Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University Nanjing China
Jiacheng Liu
Paul G. Allen Center for Computer Science and Engineering
Jiangshan Chen
Xiaoyong Wang
School of Life Sciences
Tao Yu
Chunxiong Bao
National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing China
Zhigang Zou
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, China