Interconversion between Free Charges and Bound Excitons in 2D Hybrid Lead Halide Perovskites.

ABSTRACT: The optoelectronic properties of hybrid perovskites can be easily tailored by varying their components. Specifically, mixing the common short organic cation (methylammonium (MA)) with a larger one (e.g., butyl ammonium (BA)) results in 2-dimensional perovskites with varying thicknesses of inorganic layers separated by the large organic cation. In both of these applications, a detailed understanding of the dissociation and recombination of electron-hole pairs is of prime importance. In this work, we give a clear experimental demonstration of the interconversion between bound excitons and free charges as a function of temperature by combining microwave conductivity techniques with photoluminescence measurements. We demonstrate that the exciton binding energy varies strongly (between 80 and 3

SUBMITTER: Gelvez-Rueda MC 

PROVIDER: S-EPMC5712865 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature