Rationalizing the Influence of Tunable Energy Levels on Quantum Efficiency to Design Optimal Non-Fullerene Acceptor-Based Ternary Organic Solar Cells

• DOI: 10.48550/arxiv.2112.06245
• Publication Date: 2023-03-09
• Authors: Safakath Karuthedath; Sri H. K. Paleti; Anirudh Sharma; Hang Yin; Catherine S. P. D...; Si Chen; Han Xu; Nisreen Alshehri; Nicolas Ramos; Jafar I. Khan; Jaime Martin; Gang Li; Frédéric Laquai; Derya Baran; Julien Gorenflot
• Keywords: Condensed Matter - Materials Science; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; Physics - Applied Physics; Applied Physics (physics.app-ph); 01 natural sciences; 7. Clean energy; 0104 chemical sciences

AbstractNon‐fullerene acceptor (NFA)‐based ternary bulk heterojunction solar cells (TSC) are the most efficient organic solar cells (OSCs) today due to their broader absorption and quantum efficiencies (QE) often surpassing those of corresponding binary blends. The impact on QE of the energetics driving charge transfer at the electron donor:electron acceptor (D/A) interfaces is studied in blends of PBDB‐T‐2F donor with several pairs of lower bandgap NFAs. As in binary blends, the ionization energy offset between donor and acceptor (ΔIE) controls the QE and maximizes for ΔIE > 0.5 eV. However, ΔIE is not controlled by the individual NFAs IEs but by their average, weighted for their blending ratio. Using this property, the QE of a PBDB‐T‐2F:IEICO binary blend that has an insufficient ΔIE for charge generation is improved by adding a deep IE third component: IT‐4F. Combining two NFAs enables to optimize the D/A energy alignment and cells’ QE without molecular engineering.