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 Chemistry) Journal of Physical Chemistry Letters).
The two-dimensional organic-inorganic perovskite materials have high stability and unique photoelectric properties, which have become the research hotspots in the field of materials. After decades of development, lead-based two-dimensional organic-inorganic perovskites have been widely used. For the preparation of light-emitting diodes, solar cells and photodetectors and other equipment, despite the excellent performance, the environmental toxicity of lead is a major obstacle to its commercialization. From the perspective of environmental protection, the development of lead-free two-dimensional organic - inorganic perovskite Imperative.
The research team had previously synthesized a two-dimensional J. Phys. Chem. Lett. material. This work is based on this material, adding the appropriate amount of tin (Sn) to form a series of two. Weixi tin mixed perovskite material (PEA) 2Ge1-xSnxI4. Study found that the added Sn element can effectively reduce the bandgap of two-dimensional germanium-based perovskite materials, when the ratio of Sn and Ge in the material is 1 At 1 o'clock, it has the smallest bandgap, which can effectively enhance the light absorption capability of the material, which is beneficial to increase the utilization of sunlight. At the same time, the corresponding theoretical calculations also confirmed that the added Sn element can reduce the band of the material. Gap value. In addition, the incorporation of tin in two-dimensional yttrium-based perovskite can improve its conductivity, which provides a feasible method to improve the performance of photovoltaic materials.
The above work was funded by the National Natural Science Foundation of China.
