The Effect of Interface Induced Reactions for High-Performance Near-Infrared Perovskite Light-Emitting Diodes with fine-tuning emissions
Zhongcheng Yuan a, Zhangju Hu a, Weidong Xu a, Sai Bai a, Feng Gao a
a Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden, Linköping University SE-581 83, Linköping, Sweden
Proceedings of nanoGe Fall Meeting 2021 (NFM21)
#PerFun21. Perovskites I: Solar Cells, Lighting, and Related Optoelectronics
Online, Spain, 2021 October 18th - 22nd
Organizers: Eva Unger and Feng Gao
Poster, Zhongcheng Yuan, 286
Publication date: 23rd September 2021

Metal halide perovskites are emerging as promising semiconductors for cost-effective and high performance light emitting diodes (LEDs). Previous investigations have focused on the optimization of the emissive perovskites. However, an in depth understanding of how the buried charge transport layers affect the perovskite crystallization is missing. Here, we reveal that efficient deprotonation of the undesirable organic cations by a metal oxide interlayer with a high isoelectric point, e.g. ZnO is critical to achieve highly emissive and fine tunable bandgap perovskite films for perovskite LEDs (Per LEDs). (1, 2) Combining our findings, we achieve high efficiency and bright NIR LEDs with fine tuning emission continuously filling the gap between CsPbI3 (700 nm) and FAPbI3 (800 nm). It is demonstrated that the interface induced cation exchange process is critical for achieving tunable bandgap values. Notably, all the resulting devices demonstrate high peak EQEs of over 15 %, representing the best-performing solution-processed NIR LEDs with tunable emissions.

This work was supported by the ERC Starting Grant (717026), the European Commission Marie Skłodowska-Curie Actions (691210), the National Key Research and Development Program of China (2016YFA0202402), Jiangsu High Educational Natural Science Foundation (18KJA430012), the Priority Academic Program Development of Jiangsu Higher Education Institutions, the 111 program and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC). Z.Y. would like to thank the financial support from the China Scholarship Council. W.X. thanks the National Natural Science Foundation of China (61704077), the Natural Science Foundation of Jiangsu Province (BK20171007). W.X. is a Wenner-Gren Postdoc Fellow. F.G. is a Wallenberg Academy Fellow.

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