Tuning the wettability of the blade enhances solution-sheared perovskite solar cell performance. (August 2020)

• Record Type: Journal Article
• Authors: Lee, Hyeon Seok; Kim, Min Kyu; Pae, Seong Ryul; Kim, Daehan; Seo, HyeJi; Boonmongkolras, Passarut; Gereige, Issam; Park, Steve; Shin, Byungha
• Is Part Of: Nano energy. Volume 74(2020)
• Publication Date: 2020-08
• Subjects: Perovskite -- Solar cell -- Large scale -- Shearing -- Blade coating; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2020.104830
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Solution-shearing is a promising technique to generate a perovskite thin film over a large area in a scalable manner, which is an important factor for the commercialization of perovskite solar cells. Thus far, solution-shearing parameters that were utilized to tune the thin-film properties have mainly been restricted to substrate temperature and coating speed. In this work, it is demonstrated that the wettability of the coating blade strongly influences the thin film properties, through which improved power conversion efficiency (PCE) was resulted. Specifically, with all other parameters fixed, rendering the blade de-wetting generates thicker films with larger crystallite size. This was correlated to the increase in light harvesting efficiency and carrier lifetime. The degree of texturing, on the other hand, was independent of the wettability of the blade; rather, it was the highest at a specific coating speed. At this coating speed using a de-wetting blade, the best PCE of 19.47% was achieved. Graphical abstract: Image 1 Highlights: Wettability of the blade strongly influences the properties of the perovskite film. Use of de-wetting blade yields thicker films and larger domains. PCE increased to 19.47% from 17.7% with the use of de-wetting blade. The improvement stems from increased carrier life time and light harvesting ability.