Acidic Engineering on Buried Interface toward Efficient Inorganic CsPbI3 Perovskite Light-Emitting Diodes

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-01-17 DOI:10.1021/acs.nanolett.4c05694

Wenji Zhan, Jingjing Cao, Haifei Wang, Meng Ren, Menglei Feng, Yingping Fan, Jiahao Guo, Yao Wang, Yuetian Chen, Yanfeng Miao, Yixin Zhao

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Abstract

Inorganic CsPbI₃ perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable CsPbI₃ crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads to insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles in commercialization progress. Herein, we demonstrate an effective acidic engineering strategy with wide applicability to modify the surface property of ZnO and regulate CsPbI₃ crystallization. Via systematically selecting 1,4-cyclohexanedicarboxylic acid with a mild acid dissociation constant to functionalize the buried interface, we mitigate the speed of the deprotonation reaction and achieve homogeneous CsPbI₃ films with high phase purity and fewer defects. The resulting CsPbI₃ perovskite LEDs (PeLEDs) exhibit a record EQE of 19.4% at a high luminance of 3400 cd m^–2, representing the state-of-art bulk CsPbI₃ PeLEDs. These findings provide valuable insights in the advancement of efficient CsPbI₃ PeLEDs.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.