Steric Effects on the Photovoltaic Performance of Panchromatic Ruthenium Sensitizers for Dye-Sensitized Solar Cells

• DOI: 10.1021/acsami.3c19298
• Publication Date: 2024-03-04T20:45:35Z
• Authors: Chia-Yuan Chen; Ting-Yi Lin; Chi-Feng Chiu; Mandy M. Lee; Wei-Long Li; Min-Yu Chen; Tzu-Hao Hung; Zhao-Jie Zhang; Hui-Hsu Gavin Tsai; Shih-Sheng Sun; Chun-Guey Wu
• Keywords: Panchromatic film

Three new heteroleptic Ru complexes, CYC-B22, CYC-B23C, and CYC-B23T, were prepared as sensitizers for coadsorbent-free, panchromatic, efficient dye-sensitized solar cells. They are simultaneously functionalized with highly conjugated anchoring ancillary ligands to explore the electronic steric effects on their photovoltaic characteristics. The coadsorbent-free device based CYC-B22 achieved best power conversion efficiency (PCE) of 8.63% a panchromatic response extending 850 nm. two stereoisomers, CYC-B23C CYC-B23T coordinated an unsymmetrical ligand, display similar absorption properties same driving forces electron injection well dye regeneration. Nevertheless, devices show not only remarkably distinct PCE (6.64% vs 8.38%) but also discernible stability. molecular simulation stereoisomers adsorbed TiO2 clarifies distinguishable distances (16.9 Å 19.0 Å) between sulfur atoms in NCS surface TiO2, dominating charge recombination dynamics iodine binding therefore stability devices. This study caused by ligand adsorption geometry performance dyes paves way advancing design polypyridyl metal complex sensitizers.