Synthesis, structural and optical characterization of APbX3 (A=methylammonium, dimethylammonium, trimethylammonium; X=I, Br, Cl) hybrid organic-inorganic materials

• DMAPbI3, TMAPbI3 and TMAPbBr3 are reported as new hybrid organic-inorganic compounds.
• Crystal structure and optical properties as a function of the number of methyl groups are provided.
• Correlation between structure and optical properties are given as a function of tolerance factor.

In this paper we report the synthesis, the crystal structure and the optical response of APbX3 (A=MA, DMA, and TMA; X=I, Br) hybrid organic-inorganic materials including some new phases. We observe that as the cation group increases in size, the optical absorption edge shifts to higher energies with energy steps which are systematic and independent on the anion. A linear correlation between the optical bad gap and the tolerance factor has been shown for the series of samples investigated.

The crystal structure and the optical response of the two series of hybrid organic-inorganic materials APbX3 (A=MA, DMA, and TMA; X=I, Br), which include some new phases, are reported. A dependence of crystal structure and band-gap with tolerance factor is shown.Figure optionsDownload as PowerPoint slide