Moiré superlattices in twisted two-dimensional halide perovskites

IF 37.2 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nature Materials Pub Date : 2024-06-21 DOI:10.1038/s41563-024-01921-0

Shuchen Zhang, Linrui Jin, Yuan Lu, Linghai Zhang, Jiaqi Yang, Qiuchen Zhao, Dewei Sun, Joshua J. P. Thompson, Biao Yuan, Ke Ma, Akriti, Jee Yung Park, Yoon Ho Lee, Zitang Wei, Blake P. Finkenauer, Daria D. Blach, Sarath Kumar, Hailin Peng, Arun Mannodi-Kanakkithodi, Yi Yu, Ermin Malic, Gang Lu, Letian Dou, Libai Huang

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Abstract

Moiré superlattices have emerged as a new platform for studying strongly correlated quantum phenomena, but these systems have been largely limited to van der Waals layer two-dimensional materials. Here we introduce moiré superlattices leveraging ultrathin, ligand-free halide perovskites, facilitated by ionic interactions. Square moiré superlattices with varying periodic lengths are clearly visualized through high-resolution transmission electron microscopy. Twist-angle-dependent transient photoluminescence microscopy and electrical characterizations indicate the emergence of localized bright excitons and trapped charge carriers near a twist angle of ~10°. The localized excitons are accompanied by enhanced exciton emission, attributed to an increased oscillator strength by a theoretically predicted flat band. This research showcases the promise of two-dimensional perovskites as unique room-temperature moiré materials. The emergence of moiré superlattices in twisted two-dimensional halide perovskites has been reported, revealing the emergence of localized bright excitons with enhanced emissions and trapped charge carriers.

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扭曲二维卤化物过氧化物中的莫伊里超晶格

莫埃里超晶格已成为研究强相关量子现象的新平台，但这些系统在很大程度上仅限于范德华层二维材料。在这里，我们利用超薄、不含配体的卤化物过磷酸盐，通过离子相互作用，引入了莫伊里超晶格。通过高分辨率透射电子显微镜，可以清晰地观察到具有不同周期长度的方形摩尔超晶格。与扭转角度相关的瞬态光致发光显微镜和电学特性分析表明，在接近 ~10° 扭转角度时，会出现局部明亮的激子和捕获的电荷载流子。局域激子伴随着增强的激子发射，这归因于理论预测的平带增加了振荡器强度。这项研究展示了二维过氧化物作为独特的室温摩尔材料的前景。

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来源期刊

Nature Materials 工程技术-材料科学：综合

CiteScore

62.20

自引率

0.70%

发文量

221

审稿时长

3.2 months

期刊介绍： Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.