Presentation Information
[16p-M_124-2]Dithienophosphinine-Based Cationic Monolayer for Electron Collection in Perovskite Solar Cells
〇(D)Chihiro Sakamoto1,2, Shota Hira1, Amaar Hussein2, Richard Murdey1, Minh Anh Truong1, Tomoya Nakamura1, Thomas Baumgartner2, Atsushi Wakamiya1 (1.Institute for Chemical Research, Kyoto Univ., 2.Faculty of Science, York Univ.)
Keywords:
Perovskite solar cell,Electron collection material,Monolayer
In perovskite solar cells, replacing bulk hole collection materials with monolayer hole collection materials has enabled high-performance devices owing to their excellent optical transparency. In contrast, for electron collection layers, there have been very few reports on monolayer materials that outperform bulk materials such as SnO2.In this study, we synthesized Dithieno-4-keto-1,4-dihydrophosphinine with phosphonic acid anchoring group, followed by quaternization to form the corresponding phosphonium salt. Electrochemical measurements estimated the LUMO level to be −4.18 eV, which is deeper than that of lead perovskites, indicating that the designed molecule possesses an energy level suitable for an electron collection monolayer material.Cationic molecule was applied as the electron collection layer in n–i–p lead perovskite solar cells, the device showed 11.41 % power conversion efficiency , demonstrating that the synthesized phosphonium monolayer works as a monolayer electron collection material.