Research Progresses on the Preparation Technologies Towards Large-area Perovskite Thin Films
YANG Zhichun1,, WU Di1,2,, YAN Xiaobo1,2, JIANG Zhaoyi1, LIU Zonghao1, CHEN Wei1,2
1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China 2 China-EU Institute for Clean and Renewable Energy,Huazhong University of Science and Technology, Wuhan 430074, China
Abstract: Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted widespread attention due to their high power conversion efficiency (PCE) and low fabrication costs. Their excellent photoelectric performances are mainly attributed to the unique physical properties of perovskites, such as high light absorption coefficient, high carrier mobility, long carrier life, tunable band gap. They have quickly become a star of new-generation thin-film solar cells, because they can be manufactured on large scale via solution processing method. In the past decade, the PCE of small-area devices (<1 cm2) of PSCs has skyrocketed from 3.8% in 2009 to 25.2% now; the efficiency on small module-level device (10—800 cm2) has been increased to 18.04%; the PCE on module-level device (>800 cm2) has also been refreshed to 16.1%. One of the key factors for the performance mismatch between small-area and module-level devices is the limitation of the deposition methods for large-area perovskite thin films with high quality and uniformity. The general deposition method of perovskite films for small-area devices is spin-coating. However, this met-hod exhibits the disadvantages of uninform thickness and the waste of raw materials in scalable fabrication; so, it is not suitable for fabricating large-area perovskite thin films. Currently, the deposition scheme of large-area perovskite thin films is under diversified research, and the stable industrial production scale has not yet been formed. So far, the mainly reported methods of the deposition of large-area perovskite films including doctor blading, slot-die coating, spraying coating, inkjet printing, soft-cover deposition and the vacuum vapor deposition. This review has summarized the recent research progresses on the preparation methods of large-area perovskite thin films; the basic deposition principles as well as the advantages and disadvantages of various deposition technologies have also been introduced. Finally, the problems they will be faced in the follo-wing study and in the process of industrialization have been outlined, aiming at improving the understanding of the deposition methods of large-area perovskite thin films for readers and providing useful reference for the study of large-area and high-efficiency perovskite solar modules.
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