Hu Xiaotian, Meng Xiangchuan, Yang Xia, Huang Zengqi, Xing Zhi, Li Pengwei, Tan Licheng, Su Meng, Li Fengyu, Chen Yiwang, Song Yanlin
College of Chemistry/Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang 330031, China.
Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Sci Bull (Beijing). 2021 Mar 30;66(6):527-535. doi: 10.1016/j.scib.2020.10.023. Epub 2020 Nov 3.
The power conversion effciency (PCE) of flexible perovskite solar cells (PSCs) has increased rapidly, while the mechanical flexibility and environmental stability are still far from satisfactory. Previous studies show the environmental degradation and ductile cracks of perovskite films usually begin at the grain boundaries (GBs). Herein, sulfonated graphene oxide (s-GO) is employed to construct a cementitious GBs by interacting with the [PbI] at GBs. The resultant s-GO-[PbI] complex can effectively passivate the defects of vacant iodine, and the devices with s-GO exhibit remarkable waterproofness and flexibility due to the tough and water-insoluble GBs. The champion PCE of 20.56% (1.01 cm) in a device treated with s-GO is achieved. This device retains 90% of its original PCE after 180 d stored in the ambient condition, as well as over 80% retention after 10,000 bending cycles at a curvature radius of 3 mm.
柔性钙钛矿太阳能电池（PSC）的功率转换效率（PCE）迅速提高，但其机械柔韧性和环境稳定性仍远不尽人意。先前的研究表明，钙钛矿薄膜的环境降解和韧性裂纹通常始于晶界（GB）。在此，磺化氧化石墨烯（s-GO）通过与GB处的[PbI]相互作用来构建胶结性GB。所得的s-GO-[PbI]络合物可有效钝化空位碘缺陷，并且由于坚韧且水不溶性的GB，含s-GO的器件表现出卓越的防水性和柔韧性。在经s-GO处理的器件中实现了20.56%（1.01平方厘米）的最佳PCE。该器件在环境条件下储存180天后保留了其原始PCE的90%，以及在曲率半径为3毫米的情况下进行10000次弯曲循环后保留率超过80%。
