Author
Listed:
- Yatao Zou
(Linköping University
Soochow University)
- Pengpeng Teng
(Linköping University
Nanjing University of Aeronautics and Astronautics)
- Weidong Xu
(Linköping University)
- Guanhaojie Zheng
(Linköping University)
- Weihua Lin
(Lund University)
- Jun Yin
(King Abdullah University of Science and Technology)
- Libor Kobera
(Institute of Macromolecular Chemistry of the Czech Academy of Sciences)
- Sabina Abbrent
(Institute of Macromolecular Chemistry of the Czech Academy of Sciences)
- Xiangchun Li
(Nanjing University of Posts & Telecommunications)
- Julian A. Steele
(cMACS, Department of Microbial and Molecular Systems, KU Leuven)
- Eduardo Solano
(NCD-SWEET beamline, ALBA Synchrotron Light Source)
- Maarten B. J. Roeffaers
(cMACS, Department of Microbial and Molecular Systems, KU Leuven)
- Jun Li
(Lund University)
- Lei Cai
(Soochow University)
- Chaoyang Kuang
(Linköping University)
- Ivan G. Scheblykin
(Lund University)
- Jiri Brus
(Institute of Macromolecular Chemistry of the Czech Academy of Sciences)
- Kaibo Zheng
(Lund University
Technical University of Denmark)
- Ying Yang
(Nanjing University of Aeronautics and Astronautics)
- Omar F. Mohammed
(King Abdullah University of Science and Technology)
- Osman M. Bakr
(King Abdullah University of Science and Technology)
- Tönu Pullerits
(Lund University)
- Sai Bai
(Linköping University
Zhejiang University)
- Baoquan Sun
(Soochow University)
- Feng Gao
(Linköping University)
Abstract
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.
Suggested Citation
Yatao Zou & Pengpeng Teng & Weidong Xu & Guanhaojie Zheng & Weihua Lin & Jun Yin & Libor Kobera & Sabina Abbrent & Xiangchun Li & Julian A. Steele & Eduardo Solano & Maarten B. J. Roeffaers & Jun Li &, 2021.
"Manipulating crystallization dynamics through chelating molecules for bright perovskite emitters,"
Nature Communications, Nature, vol. 12(1), pages 1-10, December.
Handle:
RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25092-7
DOI: 10.1038/s41467-021-25092-7
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