CH_(3)NH_(3)PbI_(3)太阳能电池的制备及其光电性能研究

Preparation and photoelectric properties of CH_(3)NH_(3)PbI_(3) solar cells

在旋涂过程中以乙醚作为反溶剂,采用一步旋涂法制备了不同比例二甲基甲酰胺(DMF)掺杂下的CH_(3)NH_(3)PbI_(3)型钙钛矿薄膜。通过X射线衍射(XRD)、扫描电镜(SEM)、元素分析仪、紫外-可见分光光度计(UV-Vis)等分析手段,研究了DMF掺量分别为0(纯DMSO),10%,30%,50%,70%和100%(质量分数)的CH_(3)NH_(3)PbI_(3)薄膜的晶体结构、形貌、晶粒尺寸和吸光性能。结果表明,采用不同比例DMF制备的CH_(3)NH_(3)PbI_(3)薄膜样品均得到了钙钛矿主相结构,随着DMF掺量的增大,钙钛矿主峰的强度出现先增强后减弱的现象,且在DMF掺量为70%(质量分数)时,强度达到最大;当DMF掺量为50%(质量分数)时,即m(DMF)∶m(DMSO)=1∶1时,薄膜样品表面较为致密,薄膜覆盖率高,薄膜表面为细小的等轴晶,晶粒尺寸在100~200 nm之间;所有薄膜样品的吸收边都在780 nm左右,随着DMF掺量的增大,薄膜样品的吸光性能呈现先增大后减小的趋势,当DMF掺量为50%(质量分数)时,即m(DMF)∶m(DMSO)=1∶1时,薄膜的吸光性能最好。

CH_(3)NH_(3)PbI_(3) perovskite thin films doped with dimethylformamide(DMF)in different proportions are prepared by one-step spin coating method using ether as anti solvent.The crystal structure,morphology,grain size and light absorption performance of CH_(3)NH_(3)PbI_(3) thin films doped with 0(pure DMSO),10%,30%,50%,70%and 100 wt%DMF are studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),element analyzer and UV-Vis spectrophotometer.The results show that the main phase structure of CH_(3)NH_(3)PbI_(3) thin films prepared by DMF with different ratios is perovskite.With the increased of DMF content,the main peak strength of perovskite first increases and then decreases,and reaches the maximum when DMF content is 70 wt%.When the content of DMF is 50wt%,and when m(DMF):m(DMSO)is 1∶1,the surface of the film is compact and the film coverage is high.The surface of the film is fine equiaxed crystal,and the grain size is between 100 and 200 nm.The absorption edge of all samples is about 780 nm.With the increased of DMF content,the light absorption performance of the films first increases and then decreases.When the content of DMF is 50 wt%,and when m(DMF):m(DMSO)is 1∶1,the film has the best light absorption performance.