不同淬火温度下滴铸法钙钛矿晶体生长模式分析  

Analysis of Growth Mode of Perovskite Crystals by Drop Casting Method at Different Quenching Temperatures

作　　者：肖圣宗 许雄文[1,2] Xiao Shengzong;Xu Xiongwen(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学电力学院,广州510640 [2]广东省高效清洁能源利用重点实验室华南理工大学,广州510640

出　　处：《化学学报》2024年第10期1031-1038,共8页Acta Chimica Sinica

基　　金：国家自然科学基金(No.52476073)资助。

摘　　要：大面积致密钙钛矿薄膜制备是目前钙钛矿太阳能电池研究的热门方向,其中揭示钙钛矿薄膜晶体生长规律对于实现致密的钙钛矿薄膜具有重要意义.本工作基于滴铸法在不同淬火温度下进行钙钛矿薄膜制备实验,通过光学显微镜记录其针状结晶和层状结晶生长过程,结合X射线衍射(XRD)测试和扫描电子显微镜(SEM)测试,分析了各类型晶体生长模式以及形成温度,总结钙钛矿晶体结构随淬火温度提高的演化规律.研究结果表明,随着淬火温度及结晶速率的提高,钙钛矿薄膜晶体从枝状结晶逐渐转变成了圆球状结晶,薄膜的均匀性逐步提升.The preparation of large-area dense perovskite thin films is currently a popular direction in the research of perovskite solar cells.Researchers use methods such as assisted liquid film ordered evaporation and adjusting the evaporation temperature and solution composition of perovskite solutions to ensure the formation of smooth,dense,and uniform crystal morphology in perovskite films.Despite detailed studies on the conditions for the formation of needle-shaped and layered crystals in perovskite thin films,there remains a gap in understanding the impact of increased evaporation rates on crystal growth morphology and the laws governing the transition from needle-shaped crystals to dense layered crystals in perovskite thin films.Therefore,revealing the crystal growth mode of perovskite films is crucial for achieving dense perovskite films.This study utilized the drop casting method to prepare perovskite thin films.A perovskite solution was dripped onto a preheated substrate to obtain a stable and spreading perovskite precursor liquid film,which was then evaporated and crystallized at different quenching temperatures to prepare perovskite thin films.Firstly,this study recorded the growth process of needle-shaped and layered crystals in perovskite thin films during liquid film quenching and evaporation using an optical microscope.During this process,adjusting the microscope to pre-focus and minimizing the influence of external light sources during video recording can enhance the reproducibility of experimental results.Conduct an additional annealing process for the experimental group at temperatures below 100℃to eliminate residual solvents and disintegrate complexes,a process that will not alter the crystal morphology.Through scanning electron microscope(SEM)testing,we investigated different crystal growth modes and compared the formation temperature and crystallinity of each crystal morphology with X-ray diffraction(XRD)testing.This article summarizes how the structure of perovskite crystals evolves with increasin

关 键 词：滴铸法 钙钛矿薄膜 结晶过程 晶核 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]