Rationalizing the Influence of Tunable Energy Levels on Quantum Efficiency to Design Optimal Non‐Fullerene Acceptor‐Based Ternary Organic Solar Cells
Source abstract
Abstract
Abstract Non‐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.
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Research context
OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Material Science and Engineering Program (MSE), Physical Sciences and Engineering Division (PSE) KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Kingdom of Saudi Arabia
Department of Electronic and Information Engineering Research Institute for Smart Energy (RISE) The Hong Kong Polytechnic University Hung Hom, Kowloon Hong Kong 999077 China
Physics and Astronomy Department College of Sciences King Saud University Riyadh 12372 Kingdom of Saudi Arabia
POLYMAT University of the Basque Country UPV/EHU Av. de Tolosa 72 San Sebastián 20018 Spain
Ikerbasque Basque Foundation for Science Bilbao Bilbao 481013 Spain
Departamento de Física e Ciencias da Terra Centro de Investigacións Tecnolóxicas (CIT) Universidade da Coruña Grupo de Polímeros, Esteiro Ferrol 15471 Spain
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