Department of Electrical and Electronic Engineering, The University of Hong Kong, Pok Fu Lam Road, Hong Kong SAR, China.
Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1951, Sion, Switzerland.
Adv Mater. 2019 Feb;31(8):e1805702. doi: 10.1002/adma.201805702. Epub 2019 Jan 2.
Due to their outstanding optoelectronic properties, metal halide perovskites have been intensively studied in recent years. The latest certificated efficiency of 23.3% recently achieved in perovskite solar cells (PVSCs) enables them to be used as a very promising candidate for next-generation photovoltaics. The morphology, defect density, and water resistance of perovskite films have an enormous impact on the performance and stability of PVSCs. Ligands, with coordinating capability, have been widely developed to improve the quality and stability of perovskite materials significantly. In the first section of this review, the role of ligands in fabricating perovskite films by different methods (one-step, two-step, and postdeposition treatment) is discussed. In the second section, the progress on ligand-passivated perovskites via post-treatment, in situ passivation during perovskite formation, and modifying the substrates before perovskite formation is reviewed. In the third section, a discussion of ligand-stabilized perovskite films from the perspectives of crystal crosslinking, dimensionality engineering, and interfacial modification is presented. Finally, a summary and an outlook are given.
由于其优异的光电性能，金属卤化物钙钛矿近年来受到了广泛的研究。最近钙钛矿太阳能电池 (PVSCs) 的最新认证效率达到了 23.3%，这使得它们成为下一代光伏技术的一个非常有前途的候选者。钙钛矿薄膜的形态、缺陷密度和耐水性对 PVSCs 的性能和稳定性有巨大的影响。具有配位能力的配体被广泛开发，以显著提高钙钛矿材料的质量和稳定性。在这篇综述的第一部分，讨论了配体在通过不同方法（一步法、两步法和后沉积处理）制备钙钛矿薄膜中的作用。在第二部分，综述了通过后处理、在钙钛矿形成过程中原位钝化和在形成钙钛矿之前修饰基底来钝化配体的进展。在第三部分，从晶体交联、维度工程和界面修饰的角度讨论了配体稳定的钙钛矿薄膜。最后，给出了总结和展望。
