A Review of the Role of Solvents in Formation of High-Quality Solution-Processed Perovskite Films

• Published in: ACS applied materials & interfaces Vol. 11; no. 8; pp. 7639 - 7654
• Main Authors: Cao, Xiaobing, Zhi, Lili, Jia, Yi, Li, Yahui, Zhao, Ke, Cui, Xian, Ci, Lijie, Zhuang, Daming, Wei, Jinquan
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 27.02.2019
• Subjects: ambient temperature; annealing; crystallization; solar cells; solutes; solvents; systematic review; crystallization; solvent; growth mechanism; perovskite film; solution-proceed technique
• ISSN: 1944-8244; 1944-8252; 1944-8252
• DOI: 10.1021/acsami.8b16315

Recently, perovskite solar cells have attracted great attention because of their outstanding photovoltaic performance and ease of fabrication. High-quality perovskite films hold a key in getting highly efficient perovskite solar cells. Solution-processed fabrication technique is the most widely adopted for preparing perovskite films because of its low cost. In the solution-proceed perovskite films, solvents not only play the role of dissolving the solute but also participate in the crystallization of perovskite. In the one-step method, solvents play key roles in controlling morphology, widening process window, and achieving room-temperature crystallization of perovskite films. In addition, the solvents play important roles in controlling the nuclei/growth, suppressing volume expansion during the two-step method. Especially, the solvent can induce grain coarsening during the annealing process. A deep understanding of the multiplicity of roles during the formation of perovskite films will help understand the formation mechanism of perovskite films. Here, a systematic review on the progress in fabrication of high-quality perovskite films by making use of solvent to control the crystallization is presented. Meanwhile, we elucidate the key roles of solvent in the fabrication of high-quality perovskite films.