An efficient alkoxy-substituted polymer acceptor for efficient all-polymer solar cells with low voltage loss and versatile photovoltaic applications

Energy & Environmental Science, Год журнала: 2024, Номер 17(14), С. 5191 - 5199

Опубликована: Янв. 1, 2024

All-polymer solar cells with low voltage loss for efficient outdoor and indoor photovoltaics.

Язык: Английский

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Extending Exciton Diffusion Length via an Organic‐Metal Platinum Complex Additive for High‐Performance Thick‐Film Organic Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 6, 2025

The long exciton diffusion length (LD) plays an important role in promoting dissociation, suppressing charge recombination, and improving the transport process, thereby performance of organic solar cells (OSCs), especially thick-film OSCs. However, limited LD hinders further improvement device as film thickness increases. Here, organic-metal platinum complex, namely TTz-Pt, is synthesized served a solid additive into D18-Cl:L8-BO system. addition TTz-Pt enhanced crystallinity blends, reduced energy disorder, trap density, decreased non-radiative recombination binding energy, which conducive to prolonging TTz-Pt-treated film, facilitating dissociation process along with inhibiting recombination. Consequently, D18:L8-BO:IDIC (100 nm) exhibits champion power conversion efficiency (PCE) 20.12% (certified 19.54%), one highest PCEs reported for OSCs date. Remarkably, record-breaking PCE 18.84% yielded active layer 300 nm. Furthermore, superior universality This work provides simple universal approach extending by introducing complex achieve highly efficient

Язык: Английский

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Binary Organic Solar Cells with Exceeding 19% Efficiency via the Synergy of Polyfluoride Polymer and Fluorous Solvent

Advanced Materials, Год журнала: 2024, Номер 36(30)

Опубликована: Май 11, 2024

Rational molecular design and suitable device engineering are two important strategies to boost the efficiencies in organic solar cells (OSCs). Yet these approaches independently developed, while their synergy is believed be more productive. Herein, a branched polyfluoride moiety, heptafluoroisopropoxyl group, introduced into side chains of conjugated polymers for first time. Compared with conventional alkyl chain, this chain can endow resulting polymer namely PF7 highly packing order strong crystallinity owing polarization fluorine-induced interactions, good solubility moderate miscibility retained. As result, comprehensively outperforms state-of-the-art PM6 photovoltaic properties. More importantly, based on groups fluorous solvents, new post-treatment denoted as solvent vapor annealing (FSVA) proposed match PF7. Differing from existing post-treatments, FSVA selectively reorganize fluoropolymer molecules but less impact small blend films. By employing solvent, achieves remarkable efficiency 19.09%, which among best binary OSCs. The treatment exhibit excellent universality various OSCs different material combinations or architectures.

Язык: Английский

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Halogenated Dibenzo[f,h]quinoxaline Units Constructed 2D‐Conjugated Guest Acceptors for 19% Efficiency Organic Solar Cells

Advanced Science, Год журнала: 2024, Номер 11(31)

Опубликована: Июнь 17, 2024

Abstract Halogenation of Y‐series small‐molecule acceptors (Y‐SMAs) is identified as an effective strategy to optimize photoelectric properties for achieving improved power‐conversion‐efficiencies (PCEs) in binary organic solar cells (OSCs). However, the effect different halogenation 2D‐structured large π‐fused core guest Y‐SMAs on ternary OSCs has not yet been systematically studied. Herein, four 2D‐conjugated (X‐QTP‐4F, including halogen‐free H‐QTP‐4F, chlorinated Cl‐QTP‐4F, brominated Br‐QTP‐4F, and iodinated I‐QTP‐4F) by attaching halogens into 2D‐conjugation extended dibenzo[ f , h ]quinoxaline are developed. Among these X‐QTP‐4F, Cl‐QTP‐4F a higher absorption coefficient, optimized molecular crystallinity packing, suitable cascade energy levels, complementary with PM6:L8‐BO host. Moreover, among PM6:L8‐BO:X‐QTP‐4F blends, PM6:L8‐BO:Cl‐QTP‐4F obtains more uniform size‐suitable fibrillary network morphology, well vertical phase distribution, thus boosting charge generation, transport, extraction, suppressing loss OSCs. Consequently, PM6:L8‐BO:Cl‐QTP‐4F‐based achieve 19.0% efficiency, which state‐of‐the‐art based superior devices host (17.70%) guests H‐QTP‐4F (18.23%), Br‐QTP‐4F (18.39%), I‐QTP‐4F (17.62%). The work indicates that promising gain efficient

Язык: Английский

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Asymmetrified Benzothiadiazole‐Based Solid Additives Enable All‐Polymer Solar Cells with Efficiency Over 19 %

Angewandte Chemie International Edition, Год журнала: 2024, Номер 64(1)

Опубликована: Авг. 24, 2024

Disordered polymer chain entanglements within all-polymer blends limit the formation of optimal donor-acceptor phase separation. Therefore, developing effective methods to regulate morphology evolution is crucial for achieving morphological features in organic solar cells (APSCs). In this study, two isomers, 4,5-difluorobenzo-c-1,2,5-thiadiazole (SF-1) and 5,6-difluorobenzo-c-1,2,5-thiadiazole (SF-2), were designed as solid additives based on widely-used electron-deficient benzothiadiazole unit nonfullerene acceptors. The incorporation SF-1 or SF-2 into PM6 : PY-DT blend induces stronger molecular packing via interaction, leading continuous interpenetrated networks with suitable phase-separation vertical distribution. Furthermore, after treatment SF-2, exciton diffusion lengths films are extended over 40 nm, favoring charge transport. asymmetrical characterized by an enhanced dipole moment, increases power conversion efficiency (PCE) PY-DT-based device 18.83 % due electrostatic interactions. Moreover, a ternary strategy boosts PCE SF-2-treated APSC 19 %. This work not only demonstrates one best performances APSCs but also offers approach manipulate using rational-designed additives.

Язык: Английский

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A Difluoro‐Methoxylated Ending‐Group Asymmetric Small Molecule Acceptor Lead Efficient Binary Organic Photovoltaic Blend

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 16, 2024

Abstract Developing a new end group for synthesizing asymmetric small molecule acceptors (SMAs) is crucial achieving high‐performance organic photovoltaics (OPVs). Herein, an acceptor, BTP‐BO‐4FO, featuring difluoro‐methoxylated end‐group reported. Compared to its symmetric counterpart L8‐BO, BTP‐BO‐4FO exhibits upshifted energy level, larger dipole moment, and more sequential crystallinity. By adopting two representative widely available solvent additives (1‐chloronaphthalene (CN) 1,8‐diiodooctane (DIO)), the device based on PM6:BTP‐BO‐4FO photovoltaic blend demonstrates power conversion efficiency (PCE) of 18.62% with excellent open‐circuit voltage ( V OC ) 0.933 V, which surpasses optimal result L8‐BO. The PCE realizes best efficiencies binary OPVs SMAs groups. A series investigations reveal that optimized film similar molecular packing motif fibrillar phase distribution as PM6:L8‐BO (DIO) does, resulting in comparable recombination dynamics, thus, fill factor. Besides, it found possesses efficient charge generation, yields better – J SC balance. This study provides ending enables cutting‐edge SMA‐based OPVs, enriching material library shed light further design ideas.

Язык: Английский

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Achieving 19.72% Efficiency in Ternary Organic Solar Cells through Electrostatic Potential‐Driven Morphology Control

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 9, 2024

Abstract The ternary strategy has proven effective in enhancing the performance of organic solar cells (OSCs), yet identifying optimal third component remains a challenge due to lack theoretical frameworks for predicting its impact based on molecular structure. This study addresses this by proposing quantitative parameters derived from surface electrostatic potential (ESP) as criteria selecting components. asymmetric acceptor BTP‐OS, which exhibits lower total average ESP and larger polarization index relative host acceptor, is introduced into PM6:L8‐BO system. incorporation led weakened ESP‐induced intermolecular interactions reduce miscibility with donor polymer, resulting an optimized multi‐scale morphology blend. Consequently, device achieved efficiency 19.72%, one highest values PM6:L8‐BO‐based devices, enhanced exciton dissociation charge collection, energy disorder, minimized non‐radiative losses. Comparable improvements are also verified PM6:BTP‐eC9 D18:N3 systems, demonstrating broad applicability proposed approach. not only provides practical principle components but establishes broader framework optimizing OSCs, potentially advancing development more efficient OSCs across diverse material systems.

Язык: Английский

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Rhodanine Substitution of Asymmetric Nonfullerene Acceptors for High-Performance Organic Solar Cells

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Asymmetric substitution is acknowledged as a straightforward yet potent approach for the optimization of small molecule acceptors (SMAs), thereby enhancing power conversion efficiency (PCE) organic solar cells (OSCs). In this work, we have successfully engineered and synthesized novel asymmetric SMA, designated Y6-R, which features rhodanine-terminated inner side-chain. devices with PM6 polymer donor, Y6-R demonstrated an impressive PCE 18.62% open-circuit voltage (Voc) 0.863 V, short-circuit current (Jsc) 27.89 mA cm-2, fill factor (FF) 77.35%, much higher than that symmetric SMA Y6-based (16.84%). The superior performance PM6:Y6-R can be attributed to combination factors, including upshifted LUMO energy levels, more desired exciton dissociation, collection, extraction capability, well reduced recombination suppressed Eloss. addition, molecules promote coaggregation behaviors along endowing stronger ordered crystallinity blend films. Our findings underscore effectiveness rhodanine-substitution, representative "A" units, SMAs in fine-tuning behavior efficiency.

Язык: Английский

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Tailoring small-molecule acceptors through asymmetric side-chain substitution for efficient organic solar cells

Science China Materials, Год журнала: 2025, Номер 68(3), С. 860 - 867

Опубликована: Фев. 13, 2025

Язык: Английский

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The selective adsorption mechanism of an amino acid surfactant in the flotation separation of fluorite from calcite

Chemical Engineering Science, Год журнала: 2025, Номер unknown, С. 121617 - 121617

Опубликована: Апрель 1, 2025

Язык: Английский

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