期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-25092-7
关键词
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资金
- ERC Starting Grant [717026]
- Swedish Energy Agency Energimyndigheten [48758-1, 44651-1]
- Swedish Research Council VR
- NanoLund
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]
- National Natural Science Foundation of China [91833303, 61974098, 62005126]
- National Key Research and Development Program [2016YFA0201900]
- Jiangsu High Educational Natural Science Foundation [18KJA430012]
- 111 Program
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Research Foundation - Flanders (FWO) [12Y7218N, 12Y7221N, G098319N]
- KU Leuven Research Fund [C14/19/079, 201806920071, 201906830040, 201608530162, 201806460021]
- China Scholarship Council
The chelate effect plays a critical role in controlling the crystallization dynamics of perovskite emitters and mitigating trap-mediated non-radiative losses, enhancing the coordination affinity and ultimately improving the efficiency of perovskite light-emitting diodes (PeLEDs).
Multidentate molecular additives are widely used to passivate perovskite, yet the role of chelate effect is still unclear. Here, the authors investigate a wide range of additives with different coordination number and functional moieties to establish correlation between coordination affinity and perovskite crystallisation dynamics. Molecular additives are widely utilized to minimize non-radiative recombination in metal halide perovskite emitters due to their passivation effects from chemical bonds with ionic defects. However, a general and puzzling observation that can hardly be rationalized by passivation alone is that most of the molecular additives enabling high-efficiency perovskite light-emitting diodes (PeLEDs) are chelating (multidentate) molecules, while their respective monodentate counterparts receive limited attention. Here, we reveal the largely ignored yet critical role of the chelate effect on governing crystallization dynamics of perovskite emitters and mitigating trap-mediated non-radiative losses. Specifically, we discover that the chelate effect enhances lead-additive coordination affinity, enabling the formation of thermodynamically stable intermediate phases and inhibiting halide coordination-driven perovskite nucleation. The retarded perovskite nucleation and crystal growth are key to high crystal quality and thus efficient electroluminescence. Our work elucidates the full effects of molecular additives on PeLEDs by uncovering the chelate effect as an important feature within perovskite crystallization. As such, we open new prospects for the rationalized screening of highly effective molecular additives.
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