Tailoring the Electron and Hole Landé Factors in Lead Halide Perovskite Nanocrystals by Quantum Confinement and Halide Exchange

Nestoklon, Mikhail O.; Kirstein, Erik; Yakovlev, Dmitri R.; Zhukov, Evgeny A.; Glazov, Mikhail M.; Semina, Marina A.; Ivchenko, Eugeniyus L.; Kolobkova, Elena V.; Kuznetsova, Maria S.; Bayer, Manfred

doi:10.1021/acs.nanolett.3c02349

Cited by 10 publications

(2 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The same line, shifted downward by 1.1, perfectly describes the g -factors in PEA-based 2D perovskites (blue line). The change of the g -factor can be attributed to the enhanced mixing of electron bands with the split-off electron bands under a strong confinement regime as recently proposed for perovskite nanocrystals …”

Section: Resultsmentioning

confidence: 67%

“…This is shown in Figure (f) (red circles), together with the g -factors for other representatives of 3D (black squares) and 2D perovskites (blue circles). ,,− The values of the exciton g -factor for n = 2, 3, and 4 are exactly between the 2D ( n = 1) and 3D cases and gradually approach the 3D value (MAPbI 3 ), which points to a crucial influence of the confinement on the g -factor. The observed variation in the exciton g -factor aligns with the broad predictions of the k · p model for metal-halide perovskites. , Consistent with expectations, the values of the g -factor decrease with the opening of the band gap. It is worth noting that the evolution of the g -factor as a function of the band gap shows the same curvature for 3D and 2D perovskites ( n = 1).…”

Section: Resultsmentioning

confidence: 78%

See 1 more Smart Citation

Bright Excitonic Fine Structure in Metal-Halide Perovskites: From Two-Dimensional to Bulk

Posmyk,

Zawadzka,

Łucja Kipczak

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

The optical response of two-dimensional (2D) perovskites, often referred to as natural quantum wells, is primarily governed by excitons, whose properties can be readily tuned by adjusting the perovskite layer thickness. We have investigated the exciton fine structure splitting in the archetypal 2D perovskite (PEA) 2 (MA) n−1 Pb n I 3n+1 with varying numbers of inorganic octahedral layers n = 1, 2, 3, and 4. We demonstrate that the in-plane excitonic states exhibit splitting and orthogonally oriented dipoles for all confinement regimes. The evolution of the exciton states in an external magnetic field provides further insights into the g-factors and diamagnetic coefficients. With increasing n, we observe a gradual evolution of the excitonic parameters characteristic of a 2D to three-dimensional transition. Our results provide valuable information concerning the evolution of the optoelectronic properties of 2D perovskites with the changing confinement strength.

show abstract

Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 78%

Bright Excitonic Fine Structure in Metal-Halide Perovskites: From Two-Dimensional to Bulk

Posmyk,

Zawadzka,

Łucja Kipczak

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

show abstract

Highly‐Polarized Emission Provided by Giant Optical Orientation of Exciton Spins in Lead Halide Perovskite Crystals

Kopteva,

Yakovlev,

Yalcin

et al. 2024

Advanced Science

View full text Add to dashboard Cite

Quantum technologic and spintronic applications require reliable material platforms that enable significant and long‐living spin polarization of excitations, the ability to manipulate it optically in external fields, and the possibility to implement quantum correlations between spins, i.e., entanglement. Here it is demonstrated that these conditions are met in bulk crystals of lead halide perovskites. A giant optical orientation of 85% of excitons, approaching the ultimate limit of unity, in FA0.9Cs0.1PbI2.8Br0.2 crystals is reported. The exciton spin orientation is maintained during the exciton lifetime of 55 ps resulting in high circular polarization of the exciton emission. The optical orientation is robust to detuning of the excitation energy up to 0.3 eV above the exciton resonance and remains larger than 20% up to detunings of 0.9 eV. It evidences pure chiral selection rules and suppressed spin relaxation of electrons and holes, even with large kinetic energies. The exciton and electron–hole recombinations are distinguished by means of the spin dynamics detected via coherent spin quantum beats in magnetic field. Further, electron–hole spin correlations are demonstrated through linear polarization beats after circularly polarized excitation. These findings are supported by atomistic calculations. All‐in‐all, the results establish lead halide perovskite semiconductors as suitable platform for quantum technologies.

show abstract

Growth of CsPbX3 nanocrystals using sol–gel SiO2 solid powders as reactors without capping agents towards anomalous stable emission membranes

Shi,

Zhang,

Xie

et al. 2024

Chemical Engineering Journal

View full text Add to dashboard Cite

Tailoring the Electron and Hole Landé Factors in Lead Halide Perovskite Nanocrystals by Quantum Confinement and Halide Exchange

Cited by 10 publications

References 42 publications

Bright Excitonic Fine Structure in Metal-Halide Perovskites: From Two-Dimensional to Bulk

Bright Excitonic Fine Structure in Metal-Halide Perovskites: From Two-Dimensional to Bulk

Highly‐Polarized Emission Provided by Giant Optical Orientation of Exciton Spins in Lead Halide Perovskite Crystals

Growth of CsPbX3 nanocrystals using sol–gel SiO2 solid powders as reactors without capping agents towards anomalous stable emission membranes

Contact Info

Product

Resources

About