|Title:||Robust Unencapsulated Perovskite Solar Cells Protected by a Fluorinated Fullerene Electron Transporting Layer||Authors:||Huang, H.-H. et al.
|Keywords:||Conversion efficiency;Durability;Fullerenes;Perovskite;Accelerated tests;Electron transporting layer;Fluorinated fullerenes;High power conversion;Hydrophobic nature;Long term durability;Photovoltaic technology;Photovoltaics;Perovskite solar cells||Issue Date:||2021||Journal Volume:||6||Journal Issue:||9||Start page/Pages:||3376-3385||Source:||ACS Energy Letters||Abstract:||
The emergent perovskite photovoltaics technology faces challenges like the long-term durability combining moisture, thermal, and photo stresses that prevents them from competing with established technologies. Here, we introduce a series of new fluorinated fullerenes as an electron-transporting layer (ETL) for robust perovskite photovoltaics that deliver a high power conversion efficiency of 21.27% with substantially improved durability against environmental stressing. The hydrophobic nature of the new fullerene protects the unencapsulated perovskite cell with stability over 1400 h in 85% relative humidity. Notably, the unencapsulated device maintained 80% of their original performance (T80) after being immersed in water for over 10 min. Detailed characterizations suggest that the fluorinated fullerene can immobilize the cations in perovskites and passivate the surface traps. Therefore, the T80 lifetime of the devices under constant illumination reached 1920 h. On the basis of the accelerated test, we estimate a lifetime approaching 10 years with encapsulation. The successful demonstration of the new ETL can stimulate further research and momentum for future photovoltaic technology development. ? 2021 American Chemical Society.
|Appears in Collections:||凝態科學研究中心|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.