| 초록 |
Perovskite solar cells (PSCs) have extensively attracted photovoltaic applications due to their unique properties such as high absorption coefficients, long range charge carrier diffusion lengths, and tunable bandgap. Recently, the long-term operational stability of PSCs is to be achieved for their future commercialization. Howerver, the poor device stability owing to degradation of PSCs upon moisture exposure still impedes the launch in the market. Here, we introduce a strategy to passivate the halide perovskite grain boundaries using alkylammonium salt, which leads to reduce many defect sites, suppress non-radiative recombination. We fabricated PSCs by adding a perfluorinated long alkyl chain and then achieved the highest PCE of 20.31%. In addition to hydrophobic nature of the fluorinated compounds, PSCs can retain exceeding 18% PCE despite of 1,000 h continuous operation in 40% humidity without encapsulation. Our approach provides operationally stable PSCs under moisture condition. |
