The M-series molecules with a ladder-typefused-ring core are promising acceptors (A) for organic solarcells (OSCs) owing to their excellent optoelectronic propertiesand facile synthesis. To further optimize their phot...The M-series molecules with a ladder-typefused-ring core are promising acceptors (A) for organic solarcells (OSCs) owing to their excellent optoelectronic propertiesand facile synthesis. To further optimize their photovoltaicperformance, two M-series acceptors (M36 and M13) with si-milar chemical structures are judiciously selected and com-bined in a photoactive layer to construct ternary OSCs. It isfound that a homogeneous mixed phase can be formed in theacceptor mixture due to the good compatibility between M36and M13, affording an enlarged exciton diffusion length that isconducive to efficient exciton dissociation. After blendingwith the polymer donor (D) PM6, the resultant ternary activelayer exhibits a more favorable phase-separated micro-structure and enhanced crystalline ordering than M36- andM13-based binary systems, thus enabling improved carriertransport and reduced charge recombination. Consequently,significant increases in both fill factor and photocurrent areachieved for the ternary device compared to the two binaryreference devices, delivering a high power conversion effi-ciency of 17.4%, which is among the highest efficiencies re-ported for A-D-A-type acceptors-based OSCs so far.展开更多
基金supported by the National Natural Science Foundation of China (52130306)the National Key R&D Program of China (2022YFB4200303)+2 种基金the Fundamental Research Funds for the Central Universities (2024300413)the Program of Youth Innovation Promotion Association CAS (2021299)Guangdong Basic and Applied Basic Research Foundation (2023A1515110044)。
文摘The M-series molecules with a ladder-typefused-ring core are promising acceptors (A) for organic solarcells (OSCs) owing to their excellent optoelectronic propertiesand facile synthesis. To further optimize their photovoltaicperformance, two M-series acceptors (M36 and M13) with si-milar chemical structures are judiciously selected and com-bined in a photoactive layer to construct ternary OSCs. It isfound that a homogeneous mixed phase can be formed in theacceptor mixture due to the good compatibility between M36and M13, affording an enlarged exciton diffusion length that isconducive to efficient exciton dissociation. After blendingwith the polymer donor (D) PM6, the resultant ternary activelayer exhibits a more favorable phase-separated micro-structure and enhanced crystalline ordering than M36- andM13-based binary systems, thus enabling improved carriertransport and reduced charge recombination. Consequently,significant increases in both fill factor and photocurrent areachieved for the ternary device compared to the two binaryreference devices, delivering a high power conversion effi-ciency of 17.4%, which is among the highest efficiencies re-ported for A-D-A-type acceptors-based OSCs so far.
