Understanding the Role of Small Cations on the Electroluminescence Performance of Perovskite Light-Emitting Diodes

Kwan Ho Ngai; Xinwen Sun; Yinping WangLong LinZefeng ChenQi WeiMingjie LiChuhao LuanWenjun ZhangJianbin XuMingzhu Long

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Understanding the Role of Small Cations on the Electroluminescence Performance of Perovskite Light-Emitting Diodes

机译：Understanding the Role of Small Cations on the Electroluminescence Performance of Perovskite Light-Emitting Diodes

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The delicate engineering of monovalent cations in perovskite material hasled to continuous performance breakthroughs and stability improvementfor the perovskite light-emitting diodes (PeLEDs). However, the exact roleof A-site cations on the electroluminescence (EL) performance and degradationmechanism of PeLEDs has not been systematically answered yet.Herein, it is demonstrated that the most commonly used methylammoniumcation (MA~+) has an adverse effect on the electrochemical reaction at theinterface between perovskite and metal-oxide layer, leading to deterioratedEL performance as compared to that of the formamidinium cation (FA~+)-based perovskite. It reveals that the accelerated deprotonation process ofMA~+ under an electric field will aggravate the reaction between iodide andmetal ion in oxide layer. The further substitution of a small portion of FA~+with inorganic cesium cation (Cs~+) results in much enhanced crystallinityand enlarged crystal size, leading to an optimized peak external quantumefficiency of 21.3%. The ion migration process in the PeLEDs can be significantlysuppressed with Cs~+ incorporation, leading to a smaller roll-off underlarge current density and an elongated half-lifetime of 190.1 h under a currentdensity of 20 mA cm~(-2), representing one of the most stable PeLEDs based on3D perovskite layer.

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来源
《Advanced functional materials》 |2023年第18期|2211830.1-2211830.9|共9页
作者
Kwan Ho Ngai; Xinwen Sun; Yinping WangLong LinZefeng ChenQi WeiMingjie LiChuhao LuanWenjun ZhangJianbin XuMingzhu Long;
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作者单位

South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006, China;

School of Optoelectronic Science and Engineering and CollaborativeInnovation Center of Suzhou Nano Science and TechnologyKey Lab of Advanced Optical Manufacturing Technologies of JiangsuProvince & Key Lab of Modern Optical Technologies of EducationMinistr;

Department of Applied PhysicsThe Hong Kong Polytechnic UniversityKowloon, Hong Kong SAR 999077, ChinaDepartment of Materials Science and Engineeringand Centre of Super-Diamond and Advanced FilmsCity University of Hong KongKowloon, Hong Kong SAR 999077, ChinaDepartment of Electronic Engineering and Materials Science andTechnology Research CenterThe Chinese University of Hong KongShatin, New Territories, Hong Kong SAR 999077, China;

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degradation mechanisms; hybrid perovskites; monovalent cations; operational lifetime; perovskite lighting-emitting diodes;

Understanding the Role of Small Cations on the Electroluminescence Performance of Perovskite Light-Emitting Diodes

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