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Morphology-Dependent One- and Two-Photon Absorption Properties in Blue Emitting CsPbBr3 Nanocrystals.


ABSTRACT: The linear and nonlinear optical parameters and morphologic dependence of CsPbBr3 nanocrystals (NCs) are crucial for device engineering. In particular, such information in asymmetric nanocrystals is still insufficient. We characterized the OPLA (σ1) and TPA cross sections (σ2) of a series CsPbBr3 nanocrystals with various aspect ratios (AR) using femtosecond transient absorption spectroscopy (TAS). The σ1 presents a linear volume dependence of all the samples, which agrees with the previous behavior in CsPbBr3 QDs. However, the σ2 values do not exhibit conventional power dependency of the crystal volume but are also modulated by the shape-dependent local field factors. In addition, the local field effect in CsPbBr3 NCs is contributed by their asymmetric morphologies and polar ionic lattices, which is more pronounced than in conventional semiconductor NCs. Finally, we revealed that the lifetimes of photogenerated multiexcitonic species of those nanocrystals feature identical morphology independence in both OPLA and TPA.

SUBMITTER: Alvarez SLG 

PROVIDER: S-EPMC9189923 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature

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Morphology-Dependent One- and Two-Photon Absorption Properties in Blue Emitting CsPbBr<sub>3</sub> Nanocrystals.

Alvarez Sol Laura Gutierrez SLG   Riel Christina Basse CB   Madani Mahtab M   Abdellah Mohamed M   Zhao Qian Q   Zou Xianshao X   Pullerits Tönu T   Zheng Kaibo K  

The journal of physical chemistry letters 20220527 22


The linear and nonlinear optical parameters and morphologic dependence of CsPbBr<sub>3</sub> nanocrystals (NCs) are crucial for device engineering. In particular, such information in asymmetric nanocrystals is still insufficient. We characterized the OPLA (σ<sup>1</sup>) and TPA cross sections (σ<sup>2</sup>) of a series CsPbBr<sub>3</sub> nanocrystals with various aspect ratios (AR) using femtosecond transient absorption spectroscopy (TAS). The σ<sup>1</sup> presents a linear volume dependence  ...[more]

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