Moiré superlattices in twisted two-dimensional halide perovskites

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...

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Veröffentlicht in:Nature materials 2024-09, Vol.23 (9), p.1222-1229
Hauptverfasser: Zhang, Shuchen, Jin, Linrui, Lu, Yuan, Zhang, Linghai, Yang, Jiaqi, Zhao, Qiuchen, Sun, Dewei, Thompson, Joshua J. P., Yuan, Biao, Ma, Ke, Akriti, Park, Jee Yung, Lee, Yoon Ho, Wei, Zitang, Finkenauer, Blake P., Blach, Daria D., Kumar, Sarath, Peng, Hailin, Mannodi-Kanakkithodi, Arun, Yu, Yi, Malic, Ermin, Lu, Gang, Dou, Letian, Huang, Libai
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container_issue 9
container_start_page 1222
container_title Nature materials
container_volume 23
creator Zhang, Shuchen
Jin, Linrui
Lu, Yuan
Zhang, Linghai
Yang, Jiaqi
Zhao, Qiuchen
Sun, Dewei
Thompson, Joshua J. P.
Yuan, Biao
Ma, Ke
Akriti
Park, Jee Yung
Lee, Yoon Ho
Wei, Zitang
Finkenauer, Blake P.
Blach, Daria D.
Kumar, Sarath
Peng, Hailin
Mannodi-Kanakkithodi, Arun
Yu, Yi
Malic, Ermin
Lu, Gang
Dou, Letian
Huang, Libai
description 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.
doi_str_mv 10.1038/s41563-024-01921-0
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subjects 140/125
639/301/1019
639/301/357/404
Biomaterials
Charge materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Crystal lattices
Current carriers
Electrons
Emissions
Engineering
Excitons
High resolution electron microscopy
Ionic interactions
Ligands
Materials Science
Nanotechnology
Optical and Electronic Materials
Perovskites
Photoluminescence
Physics
Quantum phenomena
Room temperature
Superlattices
Temperature
Transmission electron microscopy
Trapped charge
Two dimensional materials
title Moiré superlattices in twisted two-dimensional halide perovskites
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