Boosting CsSnI3-based near-infrared perovskite light-emitting diodes performance via solvent coordination engineering

IF 22.7 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Infomat Pub Date : 2024-02-22 DOI:10.1002/inf2.12537

Yuqing Li, Xiang Guan, Yuanyuan Meng, Jingfu Chen, Junpeng Lin, Xi Chen, Chia-Yun Liu, Yaping Zhao, Qin Zhang, Chengbo Tian, Jianxun Lu, Zhanhua Wei

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Abstract

Due to their unique photoelectric properties, nontoxic tin-based perovskites are emerging candidates for efficient near-infrared LEDs. However, the facile oxidation of Sn²⁺ and the rapid crystallization rate of tin-based perovskites result in suboptimal film quality, leading to inferior efficiencies of tin-based perovskite light-emitting diodes (Pero-LEDs). In this study, we investigate the influence of commonly used solvents on the quality of the CsSnI₃ films. Remarkably, DMSO exhibits a stronger interaction with SnI₂, forming a stable intermediate phase of SnI₂·3DMSO. This intermediate effectively inhibits the oxidation of Sn²⁺ and slows down the crystallization rate, bringing in lower defect state density and higher photoluminescence quantum yield of the prepared perovskite films. Consequently, the corresponding Pero-LEDs achieve a maximum external quantum efficiency (EQE) of 5.6%, among the most efficient near-infrared Pero-LEDs. In addition, the device processes ultra-low efficiency roll-off and high reproducibility. Our research underscores the crucial role of solvent-perovskite coordination in determining film quality. These findings offer valuable guidance for screening solvents to prepare highly efficient and stable tin-based perovskites.

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通过溶剂配位工程提升基于 CsSnI3 的近红外过氧化物发光二极管的性能

由于具有独特的光电特性，无毒锡基包晶石成为高效近红外 LED 的新兴候选材料。然而，Sn2+ 的易氧化性和锡基包晶石的快速结晶速率会导致薄膜质量不理想，从而导致锡基包晶石发光二极管（Pero-LED）的效率降低。在本研究中，我们研究了常用溶剂对 CsSnI3 薄膜质量的影响。值得注意的是，二甲基亚砜与 SnI2 的相互作用更强，形成了 SnI2-3DMSO 的稳定中间相。这种中间相能有效抑制 Sn2+ 的氧化，减缓结晶速度，从而降低缺陷态密度，提高所制备的包晶薄膜的光量子产率。因此，相应的 Pero-LED 实现了 5.6% 的最大外部量子效率 (EQE)，是效率最高的近红外 Pero-LED 之一。此外，该器件还实现了超低效率滚降和高可重复性。我们的研究强调了溶剂与包晶配位在决定薄膜质量方面的关键作用。这些发现为筛选溶剂以制备高效稳定的锡基磷酸盐提供了宝贵的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Infomat MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

37.70

自引率

3.10%

发文量

111

审稿时长

8 weeks

期刊介绍： InfoMat, an interdisciplinary and open-access journal, caters to the growing scientific interest in novel materials with unique electrical, optical, and magnetic properties, focusing on their applications in the rapid advancement of information technology. The journal serves as a high-quality platform for researchers across diverse scientific areas to share their findings, critical opinions, and foster collaboration between the materials science and information technology communities.