Unravelling additive-based nanocrystal pinning for high efficiency organic-inorganic halide perovskite light-emitting diodes
- Authors
- Park, Min-Ho; Jeong, Su-Hun; Seo, Hong-Kyu; Wolf, Christoph; Kim, Young Hoon; Kim, Hobeom; Byun, Jinwoo; Kim, Joo Sung; Cho, Himchan; Lee, Tae-Woo
- Issue Date
- Dec-2017
- Publisher
- ELSEVIER
- Keywords
- Organic-inorganic halide perovskite; Perovskite light emitting diodes; Polycrystalline perovskite film; Additive; Electron injection efficiency; Defect healing effect
- Citation
- NANO ENERGY, v.42, pp.157 - 165
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 42
- Start Page
- 157
- End Page
- 165
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/193016
- DOI
- 10.1016/j.nanoen.2017.10.012
- ISSN
- 2211-2855
- 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.
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