Layered Hybrid Perovskites for Highly Efficient Three-Photon Absorbers: Theory and Experimental Observation.

ABSTRACT: Multiphoton absorption may find many technological applications, such as enhancing the conversion efficiency of solar cells by the utilization of sub-band-energy photons, below-bandgap photodetection through the simultaneous absorption of several infrared photons for photocurrent generation, or light frequency upconversion for high-resolution, 3D imaging. To enhance multiphoton absorption in semiconducting materials, one of the strategies is to explore low-dimensional excitons. Here, a quantum perturbation theory on a giant enhancement in three-photon absorption (3PA) arising from 2D excitons in multilayered crystals of organic-inorganic hybrid perovskites is presented. The maximal 3PA coefficient is predicted to be in the range of 2-7 cm3 GW-2 at 1100 nm, the largest values reported so fa

SUBMITTER: Lu S 

PROVIDER: S-EPMC6382301 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature