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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Alkoxy Substitution on Asymmetric Conjugated Molecule Enabling over 18% Efficiency in Ternary Organic Solar Cells by Reducing Nonradiative Voltage Loss

ACS Energy Letters, Год журнала: 2022, Номер 8(1), С. 361 - 371

Опубликована: Дек. 6, 2022

A ternary strategy is considered to be an efficient and simple way further enhance the performance of organic photovoltaics (OPVs). However, "structure–performance" correlation third component in device has rarely been clearly understood from aspect material's eigenproperties. Herein, this relationship investigated depth by employing three asymmetric skeleton nonfullerene acceptors as host system PM6:BTP-eC9, respectively. Compared with TB-S TB-S1, alkoxy-substituted TB-S1-O possesses a more stable planar conformation, higher surface energy, larger ordered stacking domain due existence noncovalent conformational locking (O···H). Consequently, PM6:BTP-eC9:TB-S1-O exhibits highest efficiency 18.14% compared devices based on PM6:BTP-eC9:TB-S (16.16%) PM6:BTP-eC9:TB-S1 (16.18%). Most interestingly, only can maintain positive effect VOC improvement, because significant reduction nonradiative voltage loss observed device. Our systematic study reveals that alkoxy substitution backbone method construct for high-performance solar cells.

Язык: Английский

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CF₃-Terminated Side Chain Enables Efficiencies Surpassing 18.2% and 16.1% in Small- and Large-Scale Manufacturing of Organic Solar Cells

ACS Energy Letters, Год журнала: 2022, Номер 8(1), С. 96 - 106

Опубликована: Ноя. 22, 2022

Many studies have proven the significant roles of side chains far beyond being solubilizing groups as well interesting merits fluorination on π-backbones in intrinsic properties and device performances organic semiconductors. Considering integration two features, we herein introduce a 4,4,4-trifluorobutyl (CF3-terminated) chain into 2H-1,2,3-benzotriazole-core-based acceptor–donor–acceptor–donor–acceptor-type nonfullerene acceptor (NFA) named YCF3 demonstrate its effectiveness optoelectronic, morphological, photovoltaic properties. Comparative experimental theoretical confirmed unique features (e.g., red-shifted film absorption, better absorptivity, finely adjusted energies, higher mobility) associated with enhanced crystalline nature, compared analogous NFA an n-butyl YCH3. The best power conversion efficiency (PCE) 18.21% is achieved YCF3-based binary solar cell (OSC) together good heat light stability. Moreover, OSC presents remarkable PCE 16.11% inverted-structure large-area device.

Язык: Английский

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18.9% Efficiency Ternary Organic Solar Cells Enabled by Isomerization Engineering of Chlorine‐Substitution on Small Molecule Donors

Advanced Functional Materials, Год журнала: 2023, Номер 33(30)

Опубликована: Апрель 17, 2023

Abstract Ternary organic solar cells (OSCs) represent an efficient and facile strategy to further boost the device performance. However, selection criteria rational design of third guest small molecule (SM) material still remain less understood. In this study, two new SM donor isomers, with α‐chlorinated thiophene (αBTCl) β‐chlorinated (βBTCl) as side chains, are systematically designed, synthesized incorporated a component in PM6:L8‐BO binary blends. It is noticed that introducing donors has extended absorption photo‐active layer, induced desired distribution vertically enhanced crystallinity reduced recombination process, leading increased short‐circuit current ( J SC ) improved fill factor. Moreover, due synergetic suppressed nonradiative loss preferable morphology, ternary OSCs feature improves open‐circuit voltage V OC ). Consequently, impressive champion power conversion efficiency 18.96% 18.55% achieved by αBTCl‐based βBTCl‐based OSCs, respectively. Furthermore, record 17.46% obtained 330 nm thickness OSCs. This study demonstrates molecular isomerization can be promising approach for construct high‐performance simultaneous enhancement all photovoltaic parameters.

Язык: Английский

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Exploring the significance of packing modes and 3D framework sizes and utilizing three chlorine-mediated acceptors and the “like dissolves like” approach for achieving an efficiency over 19%

Energy & Environmental Science, Год журнала: 2023, Номер 16(12), С. 5944 - 5955

Опубликована: Янв. 1, 2023

It revealed the packing arrangement of three representative chlorinated NFAs, showing differences from linear to compact 3D network structures, which suggests evolution direction NFA materials with gradually enhanced device performance.

Язык: Английский

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