Sodium bromide additive improved film morphology and performance in perovskite light-emitting diodes
Sodium bromide additive improved film morphology and performance in perovskite light-emitting diodes
复制标题
溴化钠添加剂改善了钙钛矿发光二极管的薄膜形态和性能
DOI:
10.1063/1.4997325
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发表时间:
2017-08
影响因子:
4
通讯作者:
Wang Tao
中科院分区:
文献类型:
--
作者:
Li Jinghai;Cai Feilong;Yang Liyan;Ye Fanghao;Zhang Jinghui;Gurney Robert S.;Liu Dan;Wang Tao
Organometal halide perovskite is a promising material to fabricate light-emitting diodes (LEDs) via solution processing due to its exceptional optoelectronic properties. However, incomplete precursor conversion and various defect states in the perovskite light-emitting layer lead to low luminance and external quantum efficiency of perovskite LEDs. We show here the addition of an optimum amount of sodium bromide in the methylammonium lead bromide (MAPbBr3) precursor during a one-step perovskite solution casting process can effectively improve the film coverage, enhance the crystallinity, and passivate ionic defects on the surface of MAPbBr3 crystal grains, resulting in LEDs with a reduced turn-on voltage from 2.8 to 2.3 V and an enhanced maximum luminance from 1059 to 6942 Cd/m2 when comparing with the pristine perovskite-based device..
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