Aspect ratio and quantum confinement tunable giant Two-Photon absorption from 1D CsPbI3 perovskite nanorods

Herein, we investigate the influence of aspect ratio and quantum confinement on the single-photon (01) and twophoton absorption cross-section (02) for perovskite CsPbI3 nanorod (NR). Notably, experimentally measured data show extremely high 02 for CsPbI3 NR (10.8 x 107 GM) which is five orders of magnitude higher than organic chromophores, and two order of magnitude higher than CsPbBr3 nanocrystals. Moreover, 02 for NRs can be enhanced by two-orders of magnitude by varying the aspect ratio and 01 enhances linearly with aspect ratios. Furthermore, experimental data show moderate quantum confinement effect on the volume-normalized 01 and 02 for nanorods.

Automated summary

This study investigates the influence of aspect ratio and quantum confinement on the single-photon and two-photon absorption cross-section of perovskite CsPbI3 nanorods. Experimental data shows that CsPbI3 nanorods have an extremely high two-photon absorption cross-section, significantly surpassing organic chromophores and other CsPbBr3 nanocrystals. Moreover, adjusting the aspect ratio can significantly enhance the absorption ability. Additionally, the study also reveals a moderate quantum confinement effect on the single-photon and two-photon absorption cross-section of the nanorods.