Dual effective dopant based hole transport layer for stable and efficient perovskite solar cells. (June 2020)

• Record Type: Journal Article
• Authors: Sathiyan, Govindasamy; Syed, Ali Asgher; Chen, Cheng; Wu, Cheng; Tao, Li; Ding, Xingdong; Miao, Yawei; Li, Gongqiang; Cheng, Ming; Ding, Liming
• Is Part Of: Nano energy. Volume 72(2020)
• Publication Date: 2020-06
• Subjects: Novel dopant -- Component engineering -- Perovskite solar cells -- Hole transport layer; 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.2020.104673
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Conventionally, the hydroscopic nature of Li-TFSI and low boiling point of t-BP are considered as the primary limitations of hole transport layer (HTL), ultimately affecting the power conversion efficiency ( PCE ) and long-term stability of perovskite solar cell (PSC). To better stress these problems, a dual functional dopant termed PFPPY is reported. The in-depth operating mechanism of PFPPY with Spiro-OMeTAD, its profound effects on overall photovoltaic performance and device physics are systematically investigated. It is observed PFPPY can simultaneously take place of t-BP and FK209 in conventional HTL. By employing PFPPY as dopant cooperating with Spiro-OMeTAD, a higher PCE of 21.38% is achieved, compared with the reference device based on t-BP and FK209-doped Spiro-OMeTAD (19.69%). More importantly, the unencapsulated PFPPY -doped device shows greatly improved stability, maintaining over 90% of its initial PCE after 600 h in 40–50% RH. These findings provide a new strategy to optimize the HTL composition for efficient and stable PSCs. Graphical abstract: A dual functional dopant termed PFPPY is designed, and successfully applied into hole transport layer of perovskite solar cell, achieving a high power conversion efficiency of 21.38% and good long-term stability. Image 1 Highlights: A 1, 4-dihydropyrrolo[3, 2- b ]pyrrole (PPY) core units based small molecular material termed PFPPY is reported. PFPPY is a dual functional material, it can simultaneously work as p-type dopant and defect passivator. The PFPPY based device achieves a higher PCE of 21.38%, and maintain 90% of its initial PCE after 600 h in 40–50% RH.