The poly(styrene-co-acrylonitrile) polymer assisted preparation of high-performance inverted perovskite solar cells with efficiency exceeding 22%. (April 2021)

• Record Type: Journal Article
• Authors: Yang, Jiabao; Cao, Qi; He, Ziwei; Pu, Xingyu; Li, Tongtong; Gao, Bingyu; Li, Xuanhua
• Is Part Of: Nano energy. Volume 82(2021)
• Publication Date: 2021-04
• Subjects: Grain boundaries passivation -- Inverted perovskite solar cells -- The poly(styrene-co-acrylonitrile) polymer -- Stability improvement; 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.2020.105731
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Solution treatment of perovskite films introduces many defects in the grain boundaries (GBs), which affects the power conversion efficiency (PCE) and long-term stability of the perovskite solar cells (PSCs). Designing suitable modification materials is the key to solving these problems. Herein, we synthesize the poly(styrene-co-acrylonitrile) polymer (PS-PAN polymer) through a facile polymerization method. The polymer successfully introduces nitrile (C≡N) into the PS chain and exhibits good thermal stability. When the PS-PAN polymer is added to the antisolvent to modify the perovskite film, it can passivate the GBs/surface defects and restrain the carrier recombination of the perovskite film. As a result, we obtain an enhanced PCE in inverted PSCs increasing from 18.18% to 22.02%. More importantly, the nonencapsulated PS-PAN-modified PSCs demonstrate good illumination and thermal stabilities and maintain 90% PCE under full-spectrum illumination at 75 °C in nitrogen glove box for 800 h. In addition, the designed device is resistant to moisture, retaining 91% PCE in air (50 ± 5% relative humidity) for 4000 h. Graphical Abstract: We synthesize the PS-PAN polymer that is added to the antisolvent to modify the perovskite film. The PS-PAN-modified PSC achieves the best PCE of 22.02%, higher than control device (18.18%). Due to the PS-PAN polymer introduces nitrile (C≡N) that can passivate the GBs/surface defects and restrain the carrier recombination of the perovskite films. ga1 Highlights: The poly(styrene-co-acrylonitrile) polymer has been designed and synthesized to passivate defect. One of the highest power conversion efficiency of 22.02% was achieved in the inverted PSCs. Designed device shows better illumination, thermal and environmental stabilities.