TY - JOUR
T1 - Bidentate chelating ligands as effective passivating materials for perovskite light-emitting diodes
AU - Hsiao, Ming Chuan
AU - Chien, Ping Cheng
AU - Jhuang, Lu Syuan
AU - Chen, Fang-Chung
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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 CH 3 NH 3 PbBr 3 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.
AB - 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 CH 3 NH 3 PbBr 3 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.
UR - http://www.scopus.com/inward/record.url?scp=85064206642&partnerID=8YFLogxK
U2 - 10.1039/c8cp07000h
DO - 10.1039/c8cp07000h
M3 - Article
C2 - 30916063
AN - SCOPUS:85064206642
VL - 21
SP - 7867
EP - 7873
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 15
ER -