Halogenation Engineering of Solid Additives Enables 19.39% Efficiency and Stable Binary Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Both Donor and Acceptor Components

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 3, 2024

Abstract By selectively interacting with acceptor components, various typed solid additives achieve boosted power conversion efficiency (PCE) in organic solar cells (OSCs). However, due to the efficient active layer being composed of donor and materials, it is difficult obtain desired morphology by manipulating component alone, limiting further improvement PCEs. Herein, two a same backbone thiophene‐benzene‐thiophene (halogen‐free D1‐H) but different halogen substituents (fluorinated D1‐F chlorinated D1‐Cl) are developed probe working mechanism halogenated variation OSCs. Unlike D1‐H continuous charge distributions, D1‐Cl show isolated positive distribution benzene‐core negative thiophene, offering stronger non‐covalent interactions both (PM6) (L8‐BO), especially D1‐Cl. Consequently, D1‐Cl‐treated obtains an optimized phase separation improved molecular packing, boosting PCE 18.59% device stability OSCs, 17.62% for D1‐H‐treated counterparts. Moreover, using D18:L8‐BO D18:BTP‐eC9 as layers, binary OSCs impressive PCEs 19.29% 19.39%, respectively. This work indicates that halogenation engineering can effectively regulate improving elucidates underlying mechanism.

Язык: Английский

Achieving 19.4% Efficiency Polymer Solar Cells by Reducing Backbone Disorder in Donor Terpolymers

Advanced Functional Materials, Год журнала: 2024, Номер 34(48)

Опубликована: Авг. 6, 2024

Abstract The ternary copolymerization strategy has emerged as a promising for developing high‐efficiency donor polymers in polymer solar cells (PSCs). Terpolymers based on the star PM6 have already realized good photovoltaic performance. However, challenges such intricate synthesis of fluorine‐substituted benzodithiophene (F‐BDT) unit and entropy increase induced by backbone disorder hindered construction high‐performance terpolymers. In this work, these are addressed opting cost‐effective chlorinated‐substituted (Cl‐BDT) an alternative to F‐BDT incorporating large dipole moment electron‐deficient TPD group third component into PM7. As expected, approach effectively suppresses terpolymer while enhancing crystallinity, thereby optimizing morphology improving charge generation transport. Remarkably, PM7‐TPD‐10‐based device with 10% replacement achieves champion power conversion efficiency (PCE) 18.26%. After introducing PM7‐TPD‐10 D18:L8‐BO blend, dual mechanism 19.40% is realized. This work demonstrates that high moiety construct terpolymers important suppress facilitating optimization

Язык: Английский

Fine‐Tuning Intra/Inter‐Molecular Interaction via Ternary Copolymerization Strategy to Obtain Efficient Polymer Donors

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 5, 2025

Incorporating a third component through ternary copolymerization strategy has proven to be promising and effective approach for further improving the device performance of polymer donors. However, terpolymer donors typically exhibit negative effects on molecular stacking weaken charge transport due irregular distribution skeleton. Herein, two terpolymers PBBQ-5 (5% ff-Qx) PBBQ-10 (10% are developed by introducing difluoro-2-(3-hexyldecyloxy) quinoxaline (ff-Qx) main chain PM6. The introduction ff-Qx unit not only enables possess N···S noncovalent intramolecular interactions that contribute enlarge planarity enhance interaction but also can fine-tuning electrostatic potential (ESP) values related polymers, thereby regulate intermolecular with acceptor force. After blending L8-BO, PBBQ-5:L8-BO-based blend film exhibits appreciated miscibility, desirable phase separation sizes, more ordered packing than analogs. Consequently, an impressive power conversion efficiency (PCE) as high 19.54% is realized in PBBQ-5-based devices, which set new record Qx-based solar cells. work emphasizes drawbacks provides pathway developing high-performance optimizing intra/inter-molecular interaction.

Язык: Английский