摘要
溶剂对钙钛矿(CH_3NH_3PbI_3)太阳能电池的制备非常重要,基于目前常用的N,N-二甲基甲酰胺(DMF)和二甲基亚砜(DMSO)两种溶剂,通过一步旋涂技术制备钙钛矿薄膜,在不同溶剂的比例下制备出来的钙钛矿薄膜质量、结晶性、吸光性能,以及最终的器件转化效率都存在着较大的差异。本文通过调节溶剂的比例,研究其对钙钛矿的薄膜的形貌、结晶性、成膜质量等方面的影响。通过优化DMF和DMSO的比例,得到当DMSO∶DMF的比例为7∶3时,制备出的钙钛矿薄膜质量最高,用该薄膜制备的钙钛矿太阳能电池器件效率高达19.13%,并结合扫描电子显微镜(SEM)、X射线衍射(XRD)、紫外吸收光谱(UV-vis)、稳态荧光光谱(PL)等表征手段,具体分析了合适的溶剂比例提升钙钛矿太阳能电池器件效率。
Solvents play an important role for the preparation of perovskite(CH_3NH_3PbI_3) solar cells.Currently,based on the used N,N dimethylformamide(DMF) and dimethyl sulfoxide(DMSO) these two solvents,perovskite films are prepared by a one-step spin coating technique. The quality,crystallinity,light-absorbing performance,and the final device conversion efficiency of the perovskite films prepared at different solvent ratios are quite different. In this paper,the influence of the solvent on the morphology,crystallinity,and film formation quality of perovskite thin films was studied. By optimizing the ratio of DMF and DMSO,the perovskite film produced has the highest quality when the ratio of DMSO∶ DMF =7∶ 3. The efficiency of the perovskite solar cell prepared with the film is as high as 19. 13%,combined with scanning electrons Microscope(SEM),X-ray diffraction(XRD),UV-vis spectroscopy(UV-vis),and steady-state fluorescence spectroscopy(PL) were used to characterize the specific solvent ratio to enhance the efficiency of perovskite solar cell device.
引文
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