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The linear and nonlinear
optical parameters and morphologic dependence
of CsPbBr
3
nanocrystals (NCs) are crucial for device engineering.
In particular, such information in asymmetric nanocrystals is still
insufficient. We characterized the OPLA (σ
1
) and
TPA cross sections (σ
2
) of a series CsPbBr
3
nanocrystals with various aspect ratios (AR) using femtosecond transient
absorption spectroscopy (TAS). The σ
1
presents a
linear volume dependence of all the samples, which agrees with the
previous behavior in CsPbBr
3
QDs. However, the σ
2
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 CsPbBr
3
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.
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