Water-induced dimensionality conversion from 3D perovskites to microwires and 2D hybrid halide perovskites

Freitas, André L. M.; Souza, José A

doi:10.1039/d3tc00593c

Cited by 3 publications

(2 citation statements)

References 53 publications

(63 reference statements)

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“…If looking for larger band gaps with a UV emission, one should either go to double perovskites 6 or layered 2D systems. 7 Indeed, low-dimensional materials have strong quantum confinement, which can be used to tune in the band gap energy further. Moreover, new phenomena and interesting physical properties can be explored in these systems.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The application of ultraviolet radiation for surface and air disinfection technologies has widely emerged in response to the pandemic caused by the coronavirus. If looking for larger band gaps with a UV emission, one should either go to double perovskites or layered 2D systems . Indeed, low-dimensional materials have strong quantum confinement, which can be used to tune in the band gap energy further.…”

Section: Introductionmentioning

confidence: 99%

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Rashba Spin Splitting Limiting the Application of 2D Halide Perovskites for UV-Emitting Devices

Morais,

Caturello,

Lemes

et al. 2024

ACS Appl. Mater. Interfaces

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Layered lead halide perovskites have attracted much attention as promising materials for a new generation of optoelectronic devices. To make progress in applications, a full understanding of the basic properties is essential. Here, we study 2D-layered (BA)2PbX4 by using different halide anions (X = I, Br, and Cl) along with quantum confinement. The obtained cell parameter evolution, supported by experimental measurements and theoretical calculations, indicates strong lattice distortions of the metal halide octahedra, breaking the local inversion symmetry in (BA)2PbCl4, which strongly correlates with a pronounced Rashba spin-splitting effect. Optical measurements reveal strong photoluminescence quenching and a drastic reduction in the PL quantum yield in this larger band gap compound. We suggest that these optical results are closely related to the appearance of the Rashba effect due to the existence of a local electric dipole. The results obtained in ab initio calculations showed that the (BA)2PbCl4 possesses electrical polarization of 0.13 μC/cm2 and spin-splitting energy of about 40 meV. Our work establishes that local octahedra distortions induce Rashba spin splitting, which explains why obtaining UV-emitting materials with high PLQY is a big challenge.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%