Dalian Institute of Materials Research progresses in the study of the kinetic mechanism of two-dimensional lead-free perovskite

Recently, Han Keli, researcher of the Complex Molecular System Reaction Dynamics Group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has made new progress in the study of the kinetic mechanism of two-dimensional unleaded perovskite materials. Related work was published in The Journal of Physical Chemistry Letters.

Organic-inorganic hybrid perovskite materials have many advantages such as high absorption coefficient, long carrier diffusion distance and easy synthesis, and are widely used in the field of photovoltaics. However, the heavy metals contained in the materials lead to biological and environmental hazards, while the stability of the material needs to be improved, so the development of non-lead, stable perovskite materials is of great significance.

The Hankley team has synthesized a two-dimensional strontium-based perovskite material: (PEA)2GeI4. The two-dimensional perovskite structure is composed of an organic phenylethylamine layer and an inorganic barium iodide layer, and the layers are connected by van der Waals forces, and the interlayer distance is 1.65 nm. DFT calculations indicate that the material is a direct bandgap with a bandgap value of 2.17 eV, which is consistent with the band gap measured by the solid UV absorption, meaning it is suitable for use in tandem cells. The two-dimensional fluorene-based perovskite material can fluoresce at room temperature and has a lifetime of more than 1 ns, showing good potential for photovoltaic applications. In addition, the introduction of long-chain organic cations forms a two-dimensional layered structure that effectively enhances the stability of perovskites. This work broadened the research scope of two-dimensional layered perovskites and provided new ideas for the development of lead-free perovskites.

Prior to this, the team has obtained a series of research results on the mechanism of luminescence kinetics of non-lead perovskite nanocrystals and non-lead dual perovskites.

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