2nd International Conference on Photovoltaic Science and Technologies, 30 November - 02 December 2020, pp.98
Low dimensional perovskites have attracted a great attention due to their remarkable stability.
However, their efficiencies are not on par with their 3-dimensional counterparts, which hinders
their commercialization. In this study, we inserted a 2-dimensional perovskite layer using a novel
cation (TT), between the 3D perovskite film and the hole transport layer. 3D-2D perovskite devices
fabricated in this study exhibited a performance enhancement, resulting in an increase in their
power conversion efficiencies (PCE) from 17% to over 19%, by improving hole extraction.
Furthermore, devices showed promising stability as a result of hydrophobic nature of the TT-based
2D layer. 3D-2D PSCs retained 92% of its initial PCE at 15% humidity for 25 days without
encapsulation while the reference devices maintained only 39% of its initial efficiency.