Unveiling Energy Loss Mechanisms to Empower Ternary Organic Solar Cells with over 20% Efficiency: A Systematic Oligomeric Approach.

ABSTRACT: In organic solar cells (OSCs), the ternary strategy is a mainstream approach to obtaining highly efficient OSCs. A deeper understanding of working mechanisms and the material selection criteria for boosting open-circuit voltage (V_OC) is essential for further OSC breakthrough. Through a modular design principle, a series of oligomeric donors - 5BDD, 5BDD-F, 5BDT-F, and 5BDT-Cl - with similar molecular configurations but varying HOMO levels is systematically designed. These findings reveal that the HOMO levels of these oligomers have a negligible impact on the V_OC of the ternary OSCs. Instead, their excellent compatibility with acceptors played a pivotal role in enhancing V_OC. The oligomers effectively suppressed excessive acceptor aggregation and achieved Ag

SUBMITTER: Xia H 

PROVIDER: S-EPMC12447044 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature