Bidirectional Inhibiting Interfacial Ion Migration in the Inorganic Hole Transport Layer for Perovskite Light‐Emitting Diodes

Author:

Pan Lunyao1,Zeng Xiankan1,Qu Yuanxiao1,Mu Maolin1,Yang Shiyu1,Chen Yongjian1,Li Chenglong1,Dai Linzhu2,Tao Li3,Xin Hongqiang4,Li Wen1,Yang Weiqing15ORCID

Affiliation:

1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education) School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 P. R. China

2. School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 P. R. China

3. School of Optoelectronic Engineering Chengdu University of Information Technology Chengdu 610225 P. R. China

4. School of New Energy and Power Engineering Lanzhou Jiaotong University Lanzhou 730070 P. R. China

5. Research Institute of Frontier Science Southwest Jiaotong University Chengdu 610031 P. R. China

Abstract

AbstractCu2ZnSnS4 (CZTS) is strong candidate for hole transport in perovskite light emitting diodes (PeLEDs) due to their cost‐effectiveness, deep highest occupied molecular orbital (HOMO), and high hole mobility. However, its inherent polymetallic ions usually deteriorate the quality of the perovskite emission layer (EML) affecting device performance. In this study, a bidirectional anchoring strategy is proposed by adding 15‐crown‐5 ether (15C5) into CZTS hole transport layer (HTL) to suppress the reaction between HTL and EML. The 15C5 molecule interacts with Cu+, Zn2+ and Sn2+ cations forming host–guest complexes to impede their migration, which is elucidated by density functional theory calculations. Additionally, 15C5 can neutralize lead (Pb) defects by the abundant oxygen (O) and high electronegative cavities to reduce the nonradiative recombination of FAPbBr3 film. This bidirectional anchoring strategy effectively improves hole charge transport efficiency and suppresses nonradiative recombination at the HTL/EML interface. As a result, the optimized PeLEDs present a 3.5 times peak external quantum efficiency (EQE) from 3.12% to 11.08% and the maximum luminance (Lmax) increased from 24495 to 50584 cd m−2. These findings offer innovative insights into addressing the metal ion migration issue commonly observed in inorganic HTLs.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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