下转换发光材料对钙钛矿本征性能的影响研究

Effect of down-conversion luminescent materials on intrinsic properties of perovskite

利用太阳光的近红外和紫外部分实现全光谱响应无疑已成为提高钙钛矿太阳能电池功率转换效率的重要焦点。通过引入光致发光转换层将近红外或紫外光转换为可见光被钙钛矿光活性层利用,已被认为是一种非常有前景的途径。将两种经典的下转换发光材料(红粉和黄粉)引入钙钛矿本征层,采用一步旋涂法制备钙钛矿薄膜。利用缺陷评定高级显微系统、扫描电镜(SEM)、X射线衍射(XRD)、紫外可见吸收及荧光光谱分别探究了下转换发光材料对钙钛矿薄膜表面粗糙度、形貌、结构及光谱性能的影响。结果表明:下转换发光材料能够优化钙钛矿薄膜表面粗糙度、形貌,并未改变钙钛矿结构。紫外可见分光光度计和荧光光谱仪的结果证实了下转换发光材料确实能够拓宽钙钛矿薄膜的光谱响应范围,使整个吸收光谱范围向短波长方向移动,为有效利用全光谱提供了新思路。

Using the near-infrared and ultraviolet parts of the sunlight to achieve full spectral response has undoubtedly become an important focus to improve the power conversion efficiency of perovskite solar cells.It has been considered as a very promising way to convert near-infrared or ultraviolet light into visible light to be used by perovskite photoactive layer by introducing a photoluminescence conversion layer.In this paper,two classical down-conversion luminescent materials(red powder and yellow powder)were introduced into the perovskite intrinsic layer,and perovskite thin films were prepared by one-step spin-coating method.The effects of down-conversion luminescent materials on the surface roughness,morphology,structure and spectral properties of the perovskite thin films were investigated by using the advanced defect evaluation microscopy system,SEM,XRD,UV-Vis absorption and fluorescence spectra.The results showed that the down-conversion luminescence materials could optimize the surface roughness and morphology of the perovskite films without changing the perovskite structure.The results of UV-visible spectrophotometer and fluorescence spectrometer confirmed that the down-conversion luminescent materials could indeed broaden the spectral response range of perovskite films,and shift the entire absorption spectrum range short wavelength,providing a new idea for the effective utilization of full spectrum.