Recently, Han Keli, a 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 the two-dimensional unleaded perovskite. Related work was published in The Journal of Physical Chemistry Letters (The Journal) Journal of Physical Chemistry Letters).
Two-dimensional organic-inorganic perovskite materials have high stability and unique photoelectric properties, and have become a research hotspot in the field of materials. After decades of development, lead-based two-dimensional organic-inorganic perovskites have been widely used in the preparation of light-emitting diodes, solar cells, and photodetectors. Although the performance is excellent, the environmental toxicity of lead is the main reason for its commercialization. obstacle. From the perspective of environmental protection, it is imperative to develop lead-free two-dimensional organic-inorganic perovskites.
The research team had previously synthesized a two-dimensional thiol perovskite material (J. Phys. Chem. Lett.). This work is based on this material, adding a suitable amount of tin (Sn) to form a series of two-dimensional yttrium-tin mixed perovskite materials (PEA) 2Ge1-xSnxI4. The study found that the added Sn element can effectively reduce the bandgap of two-dimensional yttrium-based perovskite materials. When the ratio of Sn to Ge in the material is 1:1, it has the smallest band gap and can effectively enhance the material. The light absorption capacity is conducive to improving the utilization of sunlight. At the same time, the corresponding theoretical calculations also confirmed that the added Sn element can reduce the bandgap of the material. In addition, the incorporation of tin in the two-dimensional yttrium-based perovskite can improve its conductivity, which provides a feasible method for improving the performance of photovoltaic materials.
The above work was funded by key projects of the National Natural Science Foundation of China.
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