Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(36)

Опубликована: Июль 18, 2023

Achieving both high open-circuit voltage (Voc ) and short-circuit current density (Jsc to boost power-conversion efficiency (PCE) is a major challenge for organic solar cells (OSCs), wherein energy loss (Eloss inefficient charge transfer usually take place. Here, three new Y-series acceptors of mono-asymmetric asy-YC11 dual-asymmetric bi-asy-YC9 bi-asy-YC12 are developed. They share the same asymmetric D1 AD2 (D1 =thieno[3,2-b]thiophene D2 =selenopheno[3,2-b]thiophene) fused-core but have different unidirectional sidechain on side, allowing fine-tuned molecular properties, such as intermolecular interaction, packing pattern, crystallinity. Among binary blends, PM6 : one has better morphology with appropriate phase separation higher order than asy-YC9 bi-asy-YC11 ones. Therefore, bi-asy-YC12-based OSCs offer PCE 17.16 % Voc Jsc , due reduced Eloss efficient properties. Inspired by strong NIR-absorption, introduced into L8-BO construct ternary OSCs. Thanks broadened absorption, optimized morphology, furtherly minimized achieve champion 19.23 %, which highest efficiencies among these annealing-free devices. Our developed engineering constructing bi-asymmetric provides an approach

Язык: Английский

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Tunable Donor Aggregation Dominance in a Ternary Matrix of All‐Polymer Blends with Improved Efficiency and Stability

Advanced Materials, Год журнала: 2023, Номер 36(15)

Опубликована: Июль 7, 2023

Abstract Using two structurally similar polymer acceptors in constructing high‐efficiency ternary all‐polymer solar cells is a widely acknowledged strategy; however, the focus thus far has not been on how acceptor(s) would tune aggregation of donors, and furthermore film morphology device performance (efficiency stability). Herein, it reported that matching celebrity acceptor PY‐IT donor PBQx‐TCl results enhanced H ‐ PBQx‐TCl, which can be finely tuned by controlling amount second PY‐IV. Consequently, efficiency‐optimized PY‐IV weight ratio (0.2/1.2) leads to state‐of‐the‐art power conversion efficiency 18.81%, wherein light‐illuminated operational stability also along with well‐protected thermal stability. Such enhancements stabilities attributed optimization desired glass transition temperature target active layer based comprehensive characterization. In addition being high‐power case for cells, these are successful attempt using combined toward optimal morphology, provides theoretical basis construction other types organic photovoltaics beyond cells.

Язык: Английский

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Ultra Robust and Highly Efficient Flexible Organic Solar Cells with Over 18 % Efficiency Realized by Incorporating a Linker Dimerized Acceptor

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(41)

Опубликована: Авг. 24, 2023

The wearable application of flexible organic solar cells (f-OSCs) necessitates high power conversion efficiency (PCE) and mechanical robustness. However, photoactive films based on efficient non-fullerene small molecule acceptors (NF-SMAs) are typically brittle, leading to poor stability in devices. In this study, we achieved a remarkable PCE 18.06 % f-OSCs while maintaining ultrahigh robustness (with crack-onset strain (COS) higher than 11 %) by incorporating linker dimerized acceptor (DOY-TVT). Compared binary blends, ternary systems exhibit reduced non-radiative recombination, suppressed crystallization diffusion NF-SMAs, improved load distribution across the chain networks, enabling dissipation energy. Thus, developed study achieved, stability, surpassing OSCs. Moreover, retained 97 initial even after 3000 bending cycles, indicating excellent (9.1 systems). Furthermore, rigid device with inverted structure optimal active layer exhibited substantial increase retention, 89.6 865 h at 85 °C 93 more 1300 shelf storage 25 °C. These findings highlight potential oligomer for realizing high-performing

Язык: Английский

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Designing a Novel Wide Bandgap Small Molecule Guest for Enhanced Stability and Morphology Mediation in Ternary Organic Solar Cells with over 19.3% Efficiency

Advanced Science, Год журнала: 2024, Номер 11(23)

Опубликована: Апрель 3, 2024

Abstract In this study, a novel wide‐bandgap small molecule guest material, ITOA, designed and synthesized for fabricating efficient ternary organic solar cells (OSCs) ITOA complements the absorbance of PM6:Y6 binary system, exhibiting strong crystallinity modest miscibility. optimizes morphology by promoting intensive molecular packing, reducing domain size, establishing preferred vertical phase distribution. These features contribute to improved well‐balanced charge transport, suppressed carrier recombination, exciton dissociation. Consequently, significantly enhanced efficiency 18.62% device is achieved, accompanied increased short‐circuit current density ( J SC ), fill factor (FF), open‐circuit voltage V OC ). Building on success, replacing Y6 with BTP‐eC9 leads an outstanding PCE 19.33% OSCs. Notably, introduction expedites formation optimized morphology, resulting in impressive 18.04% without any postprocessing. Moreover, exhibits operational stability under maximum power point (MPP) tracking. This comprehensive study demonstrates that rationally can optimize reduce energy loss, streamline fabrication process, essential achieving high OSCs, paving way practical commercial applications.

Язык: Английский

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A high-efficiency and stable organic solar cell with balanced crystallization kinetics

Energy & Environmental Science, Год журнала: 2024, Номер 17(6), С. 2182 - 2192

Опубликована: Янв. 1, 2024

In this work, we present a conceptual strategy based on multi-acceptor components to realize balanced crystallization kinetics in organic solar cells (OSC) that deliver 19.35% power conversion efficiency with superior photostability.

Язык: Английский

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Improving the Stability of Organic Solar Cells: From Materials to Devices

Solar RRL, Год журнала: 2023, Номер 7(20)

Опубликована: Авг. 24, 2023

Organic solar cells (OSCs) are a promising emerging photovoltaic technology for energy conversion. Recently, the power conversion efficiencies of OSCs have been improved to get closer their Schottky–Queisser limit. However, operational stability remains as major challenge ahead deployment practical applications. The main causes OSC instability stem from poor intrinsic materials, metastable morphology multicomponent active layer, unstable interfaces, and sensitivity moisture oxygen. To address these issues, it is necessary comprehensive in‐depth understanding fundamentals develop an integrated solution overcome them. Herein, state‐of‐art strategies used improve aspects material design, device processing, encapsulation techniques, in hope delivering rational solutions, summarized. In end, prospects toward future development efficient stable provided.

Язык: Английский

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Dimerized small molecular acceptors: Regulation of dimer conformation realizes binary organic solar cells with highly comprehensive performance

Nano Energy, Год журнала: 2023, Номер 121, С. 109218 - 109218

Опубликована: Дек. 20, 2023

Язык: Английский

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The Asymmetric Strategy of Small‐Molecule Materials for Organic Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер 14(17)

Опубликована: Фев. 8, 2024

Abstract The conjugated small‐molecule materials of organic solar cells have always played a crucial role in light‐harvesting, charge transport, morphology optimization, and the attainment efficient devices. advancement novel understanding underlying molecular design rules serve as driving force for furthering stable photovoltaic Among variety principles, symmetry‐breaking strategy, which is well developed 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d’]‐s‐indaceno[1,2‐b:5,6‐b’]dithiophene (ITIC)‐series acceptors, recently demonstrates great potential acceptors donors realizing high power conversion efficiency. In this review, order to give deep insight on asymmetric are systematically summarized with structure elucidate structure‐performance relationship, packing behaviors, evolution. Not only delicate balance between open circuit voltage short‐circuit current density, but also reductions recombination non‐radiative considered play key points improving performance when molecule used host or guest materials. Finally, concise challenges outlooks provided future development application molecules strategies.

Язык: Английский

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Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

Energy & Environmental Science, Год журнала: 2024, Номер 17(14), С. 4944 - 4967

Опубликована: Янв. 1, 2024

Quinoxaline-based nonfullerene acceptors show highly tunable photoelectric properties and superior performance for sunlight utilization enabled by their powerful core-functionalization ability.

Язык: Английский

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How can we improve the stability of organic solar cells from materials design to device engineering?

Aggregate, Год журнала: 2024, Номер 5(5)

Опубликована: Апрель 22, 2024

Abstract Among a promising photovoltaic technology for solar energy conversion, organic cells (OSCs) have been paid much attention, of which the power conversion efficiencies (PCEs) rapidly surpassed over 20%, approaching threshold potential applications. However, device stability OSCs including storage stability, photostability and thermal remains to be an enormous challenge when faced with practical The major causes instability are rooted in poor inherent properties light‐harvesting materials, metastable morphology, interfacial reactions highly sensitive external stresses. To get rid these flaws, comprehensive review is provided about recent strategies methods improving from active layers, engineering encapsulation techniques high‐performance OSC devices. In end, prospectives next stage development devices satisfactory long‐term afforded community.

Язык: Английский

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