標題: Bidentate chelating ligands as effective passivating materials for perovskite light-emitting diodes
作者: Hsiao, Ming-Chuan
Chien, Ping-Cheng
Jhuang, Lu-Syuan
Chen, Fang-Chung
交大名義發表
光電工程學系
National Chiao Tung University
Department of Photonics
公開日期: 21-Apr-2019
摘要: Herein, four pyridine-based chelating ligands, including 1,10-phenanthroline, 4,4-bipyridine, 4,7-diphenyl-1,10-phenanthroline (Bphen) and pyridine, are used as surface treatment agents for improving the electronic properties of perovskite materials. The results of the steady-state photoluminescence (PL), time resolved PL and hole-only devices made of CH3NH3PbBr3 thin films suggest that the traps are effectively passivated after post-deposition surface treatment with bidentate chelating ligands, including 1,10-phenanthroline and 4,4-bipyridine. Furthermore, the coordination capability of Bphen was suppressed which is probably due to its two additional phenyl groups, resulting in a steric hindrance effect. When compared with mono-dentate chelating pyridine, bidentate chelating ligands are more active in the current study. Finally, perovskite light-emitting diodes (PeLEDs) are fabricated and the devices exhibit a nearly doubled device efficiency after passivation with 1,10-phenanthroline. It is anticipated that the approach proposed here is a general method for improving the photonic properties of perovskite materials and the device performance of PeLEDs.
URI: http://dx.doi.org/10.1039/c8cp07000h
http://hdl.handle.net/11536/151906
ISSN: 1463-9076
DOI: 10.1039/c8cp07000h
期刊: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume: 21
Issue: 15
起始頁: 7867
結束頁: 7873
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