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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab.
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Control of Interface Defects for Efficient and Stable Quasi-2D Perovskite Light-Emitting Diodes Using Nickel Oxide Hole Injection Layer

Author(s)
Lee, SeungjinKim, Da BinHamilton, IainDaboczi, MatyasNam, Yun SeokLee, Bo RamZhao, BaodanJang, Chung HyeonFriend, Richard H.Kim, Ji-SeonSong, Myoung Hoon
Issued Date
2018-11
DOI
10.1002/advs.201801350
URI
https://scholarworks.unist.ac.kr/handle/201301/25187
Fulltext
https://onlinelibrary.wiley.com/doi/full/10.1002/advs.201801350
Citation
ADVANCED SCIENCE, v.5, no.11, pp.1801350
Abstract
Metal halide perovskites (MHPs) have emerged as promising materials for light‐emitting diodes owing to their narrow emission spectrum and wide range of color tunability. However, the low exciton binding energy in MHPs leads to a competition between the trap‐mediated nonradiative recombination and the bimolecular radiative recombination. Here, efficient and stable green emissive perovskite light‐emitting diodes (PeLEDs) with an external quantum efficiency of 14.6% are demonstrated through compositional, dimensional, and interfacial modulations of MHPs. The interfacial energetics and optoelectronic properties of the perovskite layer grown on a nickel oxide (NiOx) and poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate hole injection interfaces are investigated. The better interface formed between the NiOx/perovskite layers in terms of lower density of traps/defects, as well as more balanced charge carriers in the perovskite layer leading to high recombination yield of carriers are the main reasons for significantly improved device efficiency, photostability of perovskite, and operational stability of PeLEDs.
Publisher
WILEY
ISSN
2198-3844
Keyword (Author)
defectsnickel oxideperovskite light-emitting diodesstability
Keyword
SOLAR-CELLSCARRIER DYNAMICSTRANSPORT LAYERSKELVIN PROBEPERFORMANCEFILMSRECOMBINATIONSPECTROSCOPYCH3NH3PBBR3GROWTH

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