甲胺铅碘前驱体薄膜放置过程中物质结构演变及对后续钙钛矿薄膜的影响

doi:10.11944/j.issn.1000-0518.2017.07.160417

摘要/Abstract

摘要：

系统研究了甲胺铅碘(MAPbI₃)前驱体薄膜在室温大气中放置过程的物质结构变化过程,发现甲胺铅碘前驱体进一步生成了更多的MAPbI₃钙钛矿,大约220 min后MAPbI₃钙钛矿不再增加而且仍有前驱体。此外还分析了这种结构演变对后续钙钛矿薄膜热退火结果的影响,发现放置后的甲胺铅碘前驱体薄膜退火过程中的X射线衍射强度和紫外-可见吸收均比新制备的薄膜的低,而且通过原子力表面形貌图的对比发现,放置后的薄膜热退火后的薄膜晶体尺寸远小于新制备的甲胺铅碘前驱体薄膜热退火后的晶体尺寸,放置后的薄膜晶体尺寸约为0.2 μm,新制备的薄膜晶体尺寸约为1.1 μm。主要原因在于:甲胺铅碘前驱体薄膜由于在室温大气中放置过程中多生成了部分甲胺铅碘(MAPbI₃),因此晶体成核数量较多,晶粒数量增加,晶体存在较多缺陷,薄膜结晶度低,所以退火时X射线衍射强度和光谱强度较低,同时晶粒尺寸变小。研究为探讨甲胺铅碘钙钛矿生成机理提供了新的思路和方向,属于甲胺铅碘钙钛矿薄膜性质的基础性研究,对实际生产和工业应用有一定指导意义。

关键词: 甲胺铅碘前驱体薄膜, 放置过程, 物质结构演变, 热退火

Abstract:

Variation of the methylamine lead iodine(MAPbI₃) precursor thin films during aging at room temperature in the air was studied. With the aging time increasing, more MAPbI₃ perovskite is generated and after about 220 min it reaches a stable value while some precursors are still left. The influence of such variation on the subsequent MAPbI₃ perovskite thin films was also studied. The X-ray diffraction intensity and UV-Vis absorption of methylamine lead iodine precursor films after aging were lower than those of the as prepared films. The comparison of atomic force microscopy(AFM) surface morphology after thermal annealing shows that the crystalline grain size of thin film made from aged precursor thin film is much smaller than that made from the as prepared precursor film, the crystalline grain size of aged film is about 0.2 μm, and that of the as prepared one is 1.1 m. These phenomena are due to the more MAPbI₃ are generated during aging, which acts as more crystal nuclei that lead to smaller crystal grains and lower degree of crystallinity. This work provides a new idea and direction to explore the formation mechanism of methylamine lead iodide perovskite, which is the basic research of methylamine lead iodide perovskite thin film properties. The work has a certain guiding role in the practical production and industrial application in photovoltaic field.

Key words: methylamine lead iodine precursor thin films, aging process, variation, thermal annealing

孟银霞, 李占国, 冯宇祥, 张吉东. 甲胺铅碘前驱体薄膜放置过程中物质结构演变及对后续钙钛矿薄膜的影响[J]. 应用化学, 2017, 34(7): 818-823.

MENG Yinxia, LI Zhanguo, FENG Yuxiang, ZHANG Jidong. Variation of the Methylamine Lead Iodine Precursor Thin Films During Aging and Its Influence on the Subsequent Perovskite Thin Films[J]. Chinese Journal of Applied Chemistry, 2017, 34(7): 818-823.

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