Unravelling additive-based nanocrystal pinning for high efficiency organic-inorganic halide perovskite light-emitting diodes
SCIE
SCOPUS
- Title
- Unravelling additive-based nanocrystal pinning for high efficiency organic-inorganic halide perovskite light-emitting diodes
- Authors
- MIN, HO PARK; Jeong, S.-H.; Seo, H.-K.; CHRISTOPH, WOLF; Kim, Y.-H.; Kim, H.; Byun, J.; Kim, J.S.; Cho, H.; LEE, TAE WOO
- Date Issued
- 2017-12
- Publisher
- Elsevier BV
- Abstract
- Organic-inorganic halide perovskite light emitting diode (PeLED) as a narrow band emitter is an emerging research field. To overcome limited electroluminescence efficiency of PeLEDs, trap-assisted non-radiative recombination in polycrystalline perovskite films should be reduced and the electron-hole balance in the PeLEDs must be improved. In this work, we investigated a practical way to effectively overcome above-mentioned issues by unravelling additive-based nanocrystal pinning (A-NCP) process using the carefully controlled electron transporting organic material solutions diluted in a volatile non-polar solvent. We found that without affecting the intrinsic crystal structure, A-NCP improved the radiative recombination rate by reducing effective defect density at grain boundaries due to the defect healing effect. Moreover, it induced the improved electron-hole balance in the dominantly p-type CH3NH3PbBr3 based PeLEDs, leading to the highest efficiency of 8.79% ever reported to date among organic-inorganic halide perovskite-based green PeLEDs. Therefore, our work gives the effective approaches for efficient PeLEDs from the investigations of the role of A-NCP incorporating a tiny amount of an electron transporting molecule as an additive to increase radiative recombination rate of polycrystalline perovskite films. ? 2017 Elsevier Ltd
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/91972
- DOI
- 10.1016/j.nanoen.2017.10.012
- ISSN
- 2211-2855
- Article Type
- Article
- Citation
- Nano Energy, vol. 42, page. 157 - 165, 2017-12
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