物理化学学报 >> 2021, Vol. 37 >> Issue (4): 2008055.doi: 10.3866/PKU.WHXB202008055

所属专题: 金属卤化物钙钛矿光电材料和器件

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钙钛矿材料制备中的溶剂配位效应

张欣, 韩登宝, 陈小梅, 陈宇, 常帅, 钟海政()   

  • 收稿日期:2020-08-19 录用日期:2020-09-15 发布日期:2020-09-17
  • 通讯作者: 钟海政 E-mail:hzzhong@bit.edu.cn
  • 作者简介:钟海政,河北清河人,北京理工大学材料学院教授、博士研究生导师,主要从事光学与光电子材料的研究,兼任The Journal of Physical Chemistry Letters执行主编
  • 基金资助:
    国家自然科学基金委员会与香港研究资助局联合科研资助合作项目(51761165021)

Effects of Solvent Coordination on Perovskite Crystallization

Zhang Xin, Dengbao Han, Xiaomei Chen, Yu Chen, Shuai Chang, Haizheng Zhong()   

  • Received:2020-08-19 Accepted:2020-09-15 Published:2020-09-17
  • Contact: Haizheng Zhong E-mail:hzzhong@bit.edu.cn
  • About author:Haizheng Zhong, Email: hzzhong@bit.edu.cn
  • Supported by:
    the National Natural Science Foundation of China/Research Grants Council Joint Research Scheme(51761165021)

摘要:

钙钛矿材料具有吸收系数大、载流子迁移率高、可溶液加工等特点,在太阳能电池、发光二极管、光电探测等领域具有潜在的应用价值。钙钛矿的光电性质与其维度、尺寸、形貌密切相关,因此研究材料的生长是实现高性能器件应用的基础。钙钛矿前驱体与溶剂之间的配位作用对钙钛矿的生长过程具有重要影响。本综述总结了钙钛矿前驱体与溶剂之间的配位作用对钙钛矿单晶、多晶薄膜、量子点三类体系制备的影响,讨论了在上述材料制备中的溶剂配位效应,特别是溶剂配位效应所形成的溶剂化物对材料生长过程,以及所制备的材料(形貌、晶相、缺陷、稳定性)的影响。最后,我们对这一研究方向存在的问题和挑战进行了分析和展望。

关键词: 钙钛矿, 配位作用, 结晶, 溶剂化

Abstract:

Halide perovskites are ionic semiconductors with outstanding features, such as high defect tolerance, long carrier diffusion length, strong photoluminescence, narrow emission line width, solution processability, and low cost of fabrication. These advantages render them promising candidates for photovoltaics, lasers, displays, and photodetectors. Theoretical and experimental studies have demonstrated that the optical properties of perovskite materials can be strongly affected by their crystal size and dimension. Owing to their ionic nature and low formation energy, perovskites can be synthesized via precipitation. This process typically involves in situ transformation of the precursors with solvent evaporation and/or solvent mixing. It is well known that the physical/chemical properties of solvents play a vital role in determining the size and dimension of the resultant products. Therefore, elucidating the effects of the solvent on perovskite crystallization is crucial for improving the performance of perovskite-based devices. Moreover, the coordination effects between perovskite precursors and solvents are a dominant parameter that influence the crystallization process because the dissolution of perovskite precursors is strongly correlated with the coordination between the perovskite precursors and solvents. Herein, this minireview summarizes recent research advances in comprehending the perovskite precursor-solvent interactions with a focus on the coordination effects. In particular, we have endeavored to discuss the influence of coordination effects on the formation of polycrystalline thin films, quantum dots, and single crystals. It was found that the formation of perovskite-solvent intermediates in coordinated solvents retard the nucleation and growth of perovskite crystals; this proves beneficial for the fabrication of high-quality micrometer-sized perovskite polycrystalline films. Meanwhile, the preformed intermediates contribute to undesired impurities and defects in single crystals and quantum dots. These insights are exceedingly helpful for the crystallization control of perovskites, thus enabling better device performance and enhanced stability. Finally, the minireview discusses the challenges facing perovskite crystallization, along with a short perspective for future studies.

Key words: Perovskite, Coordination effect, Crystallization, Solvation

MSC2000: 

  • O646