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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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Versatile Defect Passivation Methods for Metal Halide Perovskite Materials and their Application to Light-Emitting Devices

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Title
Versatile Defect Passivation Methods for Metal Halide Perovskite Materials and their Application to Light-Emitting Devices
Author
Lee, SeungjinKim, Da BinYu, Jae ChoulJang, Chung HyeonPark, Jong HyunLee, Bo RamSong, Myoung Hoon
Issue Date
2019-05
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.31, no.20, pp.1805244
Abstract
Metal halide perovskites (MHPs) have emerged as promising emitters because of their excellent optoelectronic properties, including high photoluminescence quantum yields (PLQYs), wide-range color tunability, and high color purity. However, a fundamental limitation of MHPs is their low exciton binding energy, which results in a low radiative recombination rate and the dependence of PLQY on the excitation intensity. Under the operating conditions of light-emitting diodes (LEDs), the injected current densities are typically lower than the trap density, leading to a low actual PLQY. Moreover, the defects not only initiate the decomposition of MHPs caused by extrinsic factors, but also intrinsically stimulate ion migration across the interface and lead to the corrosion of electrodes due to interaction between those electrodes, even under inert conditions. The passivation of defects has proven to be effective for mitigating the effects of defects in MHPs. Herein, the origins and theoretical calculations of the defect tolerance in MHPs and the impact of defects on both the performance and stability of perovskite LEDs are reviewed. The passivation methods and materials for MHP bulk films and nanocrystals are discussed in detail. Based on the currently reported advances, specific requirements and future research directions for display applications are suggested.
URI
https://scholarworks.unist.ac.kr/handle/201301/25846
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201805244
DOI
10.1002/adma.201805244
ISSN
0935-9648
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