Self-Assembled Monolayer-Decorated PEDOT:PSS for Balanced Hole Injection in Lead-Free Near-Infrared Perovskite Light-Emitting Diodes

IF 17.5 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2026-10-09 Epub Date: 2026-04-04 DOI:10.1021/acsenergylett.6c00196

Dong Yun Eom, Jae Woong Jung

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Abstract

Sn-based perovskite light-emitting diodes (PeLEDs) are promising lead-free alternatives for near-infrared optoelectronics, but suffer from severe interfacial losses and poor operational stability. Here, we report an effective hole-injection interface engineering strategy using a self-assembled monolayer (SAM) (MeO-2PACz) on PEDOT:PSS to realize high-performance CsSnI₃-based PeLEDs. The SAM-modified interface optimizes energy-level alignment, suppresses interfacial nonradiative recombination, and improves perovskite film coverage and crystallinity, while reducing interfacial trap density and lattice microstrain. As a result, the optimized devices exhibit a maximum radiance of 196.5 W sr^–1 m^–2 and a peak external quantum efficiency (EQE) of 8.8% for 931 nm electroluminescence, representing state-of-the-art performance for CsSnI₃-based near-infrared PeLEDs. This interfacial strategy is further demonstrated in red-emitting CsSnBr₃ PeLEDs to achieve 2.31% EQE, highlighting its general applicability for energy-efficient, bright, and environmentally benign lead-free PeLEDs.

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自组装单层修饰PEDOT:PSS用于无铅近红外钙钛矿发光二极管的平衡空穴注入

锡基钙钛矿发光二极管（PeLEDs）是近红外光电子技术的无铅替代品，但存在严重的界面损失和较差的运行稳定性。在这里，我们报告了一种有效的空穴注入接口工程策略，使用PEDOT:PSS上的自组装单层（SAM）（MeO-2PACz）来实现高性能的基于cssni3的peds。sam修饰的界面优化了能级排列，抑制了界面非辐射复合，提高了钙钛矿膜的覆盖率和结晶度，同时降低了界面陷阱密度和晶格微应变。结果表明，优化后的器件在931 nm电致发光时的最大亮度为196.5 W sr-1 m-2，峰值外量子效率（EQE）为8.8%，代表了基于cssni3的近红外pled的最先进性能。该接口策略在红色发光CsSnBr3 pled中得到进一步验证，实现了2.31%的EQE，突出了其在节能，明亮和环保的无铅pled中的普遍适用性。

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.