Conformational disorder of organic cations tunes the charge carrier mobility in two-dimensional organic-inorganic perovskites.

ABSTRACT: The chemical nature of the organic cations governs the optoelectronic properties of two-dimensional organic-inorganic perovskites. But its mechanism is not fully understood. Here, we apply femtosecond broadband sum frequency generation vibrational spectroscopy to investigate the molecular conformation of spacer organic cations in two-dimensional organic-inorganic perovskite films and establish a correlation among the conformation of the organic cations, the charge carrier mobility, and broadband emission. Our study indicates that both the mobility and broadband emission show strong dependence on the molecular conformational order of organic cations. The gauche defect and local chain distortion of organic cations are the structural origin of the in-plane mobility reduction and broad emissio

SUBMITTER: Li C 

PROVIDER: S-EPMC7603336 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature