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Article
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Chengliang He et al.
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Kaien Chong et al.
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(2022)
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Summary: In this study, a new low-bandgap asymmetric small molecule acceptor TIT-2Cl based on thieno[3,2-b]indole core was introduced into PM6:Y6-based polymer solar cells (PSCs) to suppress the over-aggregation of Y6 molecules and improve the efficiency. The addition of TIT-2Cl contributed to improved light harvesting, charge separation, transport, and extraction. By using the layer-by-layer (LBL) progressive spin-coating method, the PSCs achieved a champion efficiency of 18.18%, the highest reported for PM6:Y6-based PSCs, with superior stability and compositional insensitivity.
ADVANCED FUNCTIONAL MATERIALS
(2022)
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Summary: By incorporating an asymmetric acceptor into binary blends, ternary organic solar cells (OSCs) were prepared. The good compatibility of two isogenous acceptors with similar chemical skeletons optimized the morphology and improved the photon absorption ability and energy level matching. The optimized ternary OSCs achieved high conversion efficiency and champion efficiency.
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Summary: Asymmetric substitution of end-groups is applied in molecular donors for the first time, resulting in donors with increased dipole moments and enhanced aggregation propensity. Among the asymmetric donors studied, SM-CA-Reh shows the highest power conversion efficiency (PCE) and fill factor (FF) when using N3 as the acceptor. Characterization results suggest that the packing morphology of blend films is mainly influenced by π-π interaction rather than dipole effect or crystallinity.
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ACCOUNTS OF CHEMICAL RESEARCH
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Wei Gao et al.
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Baobing Fan et al.
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Qunping Fan et al.
Summary: The newly developed multi-selenophene-containing PSMA material PFY-3Se shows outstanding performance in all-polymer solar cells, with high efficiency, low energy loss, and good batch-to-batch reproducibility, indicating great potential for practical applications.
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Chao Li et al.
Summary: The molecular design of acceptor and donor molecules has significantly advanced organic photovoltaics. By introducing branched alkyl chains in non-fullerene acceptors, favorable morphology in the active layer can be achieved, leading to a certified device efficiency of 17.9%. This modification can completely alter the molecular packing behavior of non-fullerene acceptors, resulting in improved structural order and charge transport in thin films.
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Jinlong Cai et al.
Summary: By systematically designing and synthesizing asymmetric and halogenated NFAs, this study demonstrates that IDTT-Cl-2F, when blended with the donor material PBDB-T-2Cl, can achieve the highest PCE among NFAs, showing superior performance.
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