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有机-无机杂化钙钛矿材料具有分子尺度上调节能带结构的特点,在光、电、磁等领域均表现出了优异的性能.通过简单的旋涂方法,成功的制备了具有不同无机层层数的杂化钙钛矿材料(C6H13NH3)2(CH3NH3)n-1PbnI3n+1(简写为C6PbnI3n+1,n=1,2,3),系统研究了无机层层数对晶体结构、带隙、激子结合能、光致发光和光电性能的影响规律.研究表明,随着无机层层数的增加,杂化材料的激子吸收峰发生红移、能隙变窄、激子结合能减少.同时,激子因玻尔半径增大将更加容易分离,且材料的载流子传输性能增加,最终使光电导性能得到大幅度的提高.
The organic-inorganic hybrid perovskite material has the characteristics of adjusting the band structure on the molecular scale and has shown excellent properties in the fields of light, electricity, magnetism, etc. By simple spin coating method, the material with different inorganic layers (C6H13NH3) 2 (CH3NH3) n-1PbnI3n + 1 (abbreviated as C6PbnI3n + 1, n = 1, 2 and 3) were investigated systematically. The influence of the number of inorganic layers on the crystal structure, , Exciton binding energy, photoluminescence and optoelectronic properties.The results show that with the increase of the number of inorganic layers, the exciton absorption peak of the hybrid material redshifts, the energy gap narrows, and the exciton binding energy decreases At the same time, the excitons will be more easily separated due to the increase of the Bohr radius, and the carrier transport properties of the materials will increase, finally the photoconductivity will be greatly improved.