Moiré superlattices in twisted two-dimensional halide perovskites
Source abstract
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.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · 2D Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
Show source-provided references
1. Cao, Y. et al. Unconventional superconductivity in magic-angle graphene superlattices. Nature 556, 43–50 (2018).10.1038/nature26160 ↗
2. Ma, L. et al. Strongly correlated excitonic insulator in atomic double layers. Nature 598, 585–589 (2021).10.1038/s41586-021-03947-9 ↗
3. Halbertal, D. et al. Multilayered atomic relaxation in van der Waals heterostructures. Phys. Rev. X 13, 011026 (2023).
4. Naik, M. H. et al. Intralayer charge-transfer moiré excitons in van der Waals superlattices. Nature 609, 52–57 (2022).10.1038/s41586-022-04991-9 ↗
5. Song, Z. et al. Deep quantum-dot arrays in moiré superlattices of non-van der Waals materials. J. Am. Chem. Soc. 144, 14657–14667 (2022).10.1021/jacs.2c04390 ↗
6. Kennes, D. M. et al. Moiré heterostructures as a condensed-matter quantum simulator. Nat. Phys. 17, 155–163 (2021).10.1038/s41567-020-01154-3 ↗
7. Zhang, L., Zhang, X. & Lu, G. Predictions of moiré excitons in twisted two-dimensional organic–inorganic halide perovskites. Chem. Sci. 12, 6073–6080 (2021).10.1039/D1SC00359C ↗
8. Weeks, C. & Franz, M. Topological insulators on the Lieb and perovskite lattices. Phys. Rev. B 82, 085310 (2010).10.1103/PhysRevB.82.085310 ↗
9. Dou, L. et al. Atomically thin two-dimensional organic–inorganic hybrid perovskites. Science 349, 1518–1521 (2015).10.1126/science.aac7660 ↗
10. Leng, K. et al. Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation. Nat. Mater. 17, 908–914 (2018).10.1038/s41563-018-0164-8 ↗
11. Stoumpos, C. C. et al. Ruddlesden–Popper hybrid lead iodide perovskite 2D homologous semiconductors. Chem. Mater. 28, 2852–2867 (2016).10.1021/acs.chemmater.6b00847 ↗
12. Blancon, J. C. et al. Extremely efficient internal exciton dissociation through edge states in layered 2D perovskites. Science 355, 1288–1292 (2017).10.1126/science.aal4211 ↗
13. Wang, Y. et al. Chemical vapor deposition growth of single-crystalline cesium lead halide microplatelets and heterostructures for optoelectronic applications. Nano Res. 10, 1223–1233 (2017).10.1007/s12274-016-1317-1 ↗
14. Liu, Y., Yang, Z. & Liu, S. Recent progress in single-crystalline perovskite research including crystal preparation, property evaluation, and applications. Adv. Sci. 5, 1700471 (2018).10.1002/advs.201700471 ↗
15. Gao, Y. & Dou, L. Organic semiconductor-incorporated two-dimensional halide perovskites. Natl Sci. Rev. https://doi.org/10.1093/nsr/nwab111 (2021).10.1093/nsr/nwab111 ↗
16. Gao, Y. et al. Molecular engineering of organic–inorganic hybrid perovskites quantum wells. Nat. Chem. 11, 1151–1157 (2019).10.1038/s41557-019-0354-2 ↗
17. Akriti et al. Layer-by-layer anionic diffusion in two-dimensional halide perovskite vertical heterostructures. Nat. Nanotechnol. 16, 584–591 (2021).10.1038/s41565-021-00848-w ↗
18. Yang, A. et al. Giant enhancement of photoluminescence emission in WS2-two-dimensional perovskite heterostructures. Nano Lett. 19, 4852–4860 (2019).10.1021/acs.nanolett.8b05105 ↗
19. Shi, E. et al. Two-dimensional halide perovskite lateral epitaxial heterostructures. Nature 580, 614–620 (2020).10.1038/s41586-020-2219-7 ↗
20. Pan, D. et al. Deterministic fabrication of arbitrary vertical heterostructures of two-dimensional Ruddlesden–Popper halide perovskites. Nat. Nanotechnol. 16, 159–165 (2021).10.1038/s41565-020-00802-2 ↗
21. Tabuchi, Y. et al. Preparation and characterization of natural lower dimensional layered perovskite-type compounds. J. Phys. Chem. Solids 61, 837–845 (2000).10.1016/S0022-3697(99)00402-3 ↗
22. Niu, W., Eiden, A., Prakash, G. V. & Baumberg, J. J. Exfoliation of self-assembled 2D organic-inorganic perovskite semiconductors. Appl. Phys. Lett. 104, 171111 (2014).10.1063/1.4874846 ↗
23. Li, P. et al. Two-dimensional CH3NH3PbI3 perovskite nanosheets for ultrafast pulsed fiber lasers. ACS Appl. Mater. Interfaces 9, 12759–12765 (2017).10.1021/acsami.7b01709 ↗
24. Liu, J. et al. Two-dimensional CH3NH3PbI3 perovskite: synthesis and optoelectronic application. ACS Nano 10, 3536–3542 (2016).10.1021/acsnano.5b07791 ↗
25. Wang, Z. et al. Degradation of two-dimensional CH3NH3PbI3 perovskite and CH3NH3PbI3/graphene heterostructure. ACS Appl. Mater. Interfaces 10, 24258–24265 (2018).10.1021/acsami.8b04310 ↗
26. Wang, Y. et al. Two-dimensional van der Waals epitaxy kinetics in a three-dimensional perovskite halide. Cryst. Growth Des. 15, 4741–4749 (2015).10.1021/acs.cgd.5b00949 ↗
27. Sun, Y. et al. Engineering the phases and heterostructures of ultrathin hybrid perovskite nanosheets. Adv. Mater. 32, 2002392 (2020).10.1002/adma.202002392 ↗
28. Adjokatse, S. et al. Scalable fabrication of high-quality crystalline and stable FAPbI3 thin films by combining doctor-blade coating and the cation exchange reaction. Nanoscale 11, 5989–5997 (2019).10.1039/C8NR10267H ↗
29. Reus, M. A. et al. Time-resolved orientation and phase analysis of lead halide perovskite film annealing probed by in situ GIWAXS. Adv. Opt. Mater. 10, 2102722 (2022).10.1002/adom.202102722 ↗
30. Blancon, J. C. et al. Scaling law for excitons in 2D perovskite quantum wells. Nat. Commun. 9, 2254 (2018).10.1038/s41467-018-04659-x ↗
31. Yang, Y. et al. Comparison of recombination dynamics in CH3NH3PbBr3 and CH3NH3PbI3 perovskite films: influence of exciton binding energy. J. Phys. Chem. Lett. 6, 4688–4692 (2015).10.1021/acs.jpclett.5b02290 ↗
32. Dyksik, M. et al. Tuning the excitonic properties of the 2D (PEA)2(MA)n–1PbnI3n+1 perovskite family via quantum confinement. J. Phys. Chem. Lett. 12, 1638–1643 (2021).10.1021/acs.jpclett.0c03731 ↗
33. Zhu, H. et al. Lead halide perovskite nanowire lasers with low lasing thresholds and high quality factors. Nat. Mater. 14, 636–642 (2015).10.1038/nmat4271 ↗
34. Akselrod, G. M. et al. Subdiffusive exciton transport in quantum dot solids. Nano Lett. 14, 3556–3562 (2014).10.1021/nl501190s ↗
35. Li, W. et al. Direct characterization of carrier diffusion in halide-perovskite thin films using transient photoluminescence imaging. ACS Photonics 6, 2375–2380 (2019).10.1021/acsphotonics.9b00778 ↗
36. Saidaminov, M. I. et al. Multi-cation perovskites prevent carrier reflection from grain surfaces. Nat. Mater. 19, 412–418 (2020).10.1038/s41563-019-0602-2 ↗
37. Deng, S. et al. Long-range exciton transport and slow annihilation in two-dimensional hybrid perovskites. Nat. Commun. 11, 664 (2020).10.1038/s41467-020-14403-z ↗
38. Brem, S. et al. Hybridized intervalley moiré excitons and flat bands in twisted WSe2 bilayers. Nanoscale 12, 11088–11094 (2020).10.1039/D0NR02160A ↗
39. Choi, J. et al. Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures. Sci. Adv. 6, eaba8866 (2020).10.1126/sciadv.aba8866 ↗
40. Zhang, L. et al. Van der Waals heterostructure polaritons with moiré-induced nonlinearity. Nature 591, 61–65 (2021).10.1038/s41586-021-03228-5 ↗
41. Basov, D. N. et al. Polariton panorama. Nanophotonics 10, 549–577 (2021).10.1515/nanoph-2020-0449 ↗
42. Su, R. et al. Observation of exciton polariton condensation in a perovskite lattice at room temperature. Nat. Phys. 16, 301–306 (2020).10.1038/s41567-019-0764-5 ↗
43. Yu, Y. et al. Tunable angle-dependent electrochemistry at twisted bilayer graphene with moiré flat bands. Nat. Chem. 14, 267–273 (2022).10.1038/s41557-021-00865-1 ↗