Open AccessHigh optical nonlinearity in low-dimensional halide perovskite polycrystalline films
Author(s) -
Wei-Yun Liang,
Fangzhou Liu,
Yu Lu,
Jasminka Popović,
Aleksandra B. Djurišić,
Hyeyoung Ahn
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.394172
Subject(s) - crystallite , materials science , refractive index , optics , perovskite (structure) , dielectric , absorption edge , halide , absorption (acoustics) , nonlinear optics , optoelectronics , band gap , chemistry , crystallography , inorganic chemistry , laser , physics , metallurgy , composite material
The nonlinear optical properties of low-dimensional polycrystalline halide perovskite films consisting of ethylammonium (EA) and butylammonium (BA) cations are investigated using Z-scan technique. Across the band-edge, two-dimensional (BA) 2 PbI 4 exhibits a transition from saturable absorption (SA) to reverse-SA and its nonlinear absorption and nonlinear refractive index are much smaller than those of bulk counterparts. Meanwhile, EAPbI 3 with one-dimensionality of the inorganic structure shows the SA behavior both above and below band-edge and the estimated nonlinear optical parameters of polycrystalline EAPbI 3 are comparable to those of single-crystalline ones, attributed to high dielectric contrast between the inorganic and organic elements in one-dimensional structures.