Mixed-solvent-vapor annealing of perovskite for photovoltaic device efficiency enhancement. (October 2016)

• Record Type: Journal Article
• Authors: Sun, Xu; Zhang, Chunfu; Chang, Jingjing; Yang, Haifeng; Xi, He; Lu, Gang; Chen, Dazheng; Lin, Zhenhua; Lu, Xiaoli; Zhang, Jincheng; Hao, Yue
• Is Part Of: Nano energy. Volume 28(2016:Oct.)
• Page Start: 417
• Page End: 425
• Publication Date: 2016-10
• Subjects: Perovskite solar cells -- Inverted planar heterojunction structure -- Solvent annealing -- Mixed-solvent-vapor; 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.2016.08.055
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: The key to improve the photovoltaic performance of perovskite solar cells is the quality of perovskite materials. Here, we report a growth mode that the perovskite precursor film is thermal annealed in mixed anti-solvent (IPA) and solvent (DMF) (100:1, v/v) vapor environment to improve the film quality, which enhances the power conversion efficiency of CH3 NH3 PbI3 based planar heterojunction solar cell device from 12.2% to 15.1%. After 8 days' storage without encapsulation, the devices retained about 75% of their original efficiency while devices without solvent annealing reduced to 40% of that. It should be mentioned that by further applying compositional engineering such as using CH3 NH3 PbI3−x Clx perovskite precursor and using interface engineering approach, the efficiency of planar heterojunction solar cell could be further enhanced up to 18.9%. The enhancement in photovoltaic performance and stability is due to the perovskite film quality improvement, with the increased average grain size and crystallinity of perovskite. Graphical abstract: Highlights: A growth mode of perovskite based on mixed anti-solvent and solvent vapor annealing is proposed. The perovskite film quality is improved, with the increased average grain size and crystallinity. The power conversion efficiency of perovskite planar heterojunction solar cell is greatly enhanced and shows negligible hysteresis. The stability of the corresponding device is also obviously improved.