Self‐Assembled Molecules with Asymmetric Backbone for Highly Stable Binary Organic Solar Cells with 19.7 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(18)

Опубликована: Март 9, 2024

The hole-transporting material (HTM), poly (3,4-ethylene dioxythiophene) poly(styrene sulfonate) (PEDOT : PSS), is the most widely used in realization of high-efficiency organic solar cells (OSCs). However, stability PEDOT PSS-based OSCs quite poor, arising from its strong acidity and hygroscopicity. In addition, PSS has an absorption infrared region high highest occupied molecular orbital (HOMO) energy level, thus limiting enhancement short-circuit current density (J

Язык: Английский

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Bisphosphonate‐Anchored Self‐Assembled Molecules with Larger Dipole Moments for Efficient Inverted Perovskite Solar Cells with Excellent Stability

Advanced Materials, Год журнала: 2024, Номер 36(28)

Опубликована: Май 20, 2024

Abstract In the fabrication of inverted perovskite solar cells (PSCs), wettability, adsorbability, and compactness self‐assembled monolayers (SAMs) on conductive substrates have critical impacts quality films defects at buried perovskite‐substrate interface, which control efficiency stability devices. Herein, three bisphosphonate‐anchored indolocarbazole (IDCz)‐derived SAMs, IDCz‐1, IDCz‐2, IDCz‐3, are designed synthesized by modulating position two nitrogen atoms IDCz unit to improve molecular dipole moments strengthen π–π interactions. Regulating work functions (WF) FTO electrodes through energy levels, band bends upwards with a small offset for ITO/IDCz‐3/perovskite, thereby promoting hole extraction blocking electrons. As result, PSC employing IDCz‐3 as hole‐collecting layer exhibits champion PCE 25.15%, is record multipodal SAMs‐based PSCs. Moreover, unencapsulated device can be stored least 1800 h little degradation in performance.

Язык: Английский

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Advances in Stretchable Organic Photovoltaics: Flexible Transparent Electrodes and Deformable Active Layer Design

Advanced Materials, Год журнала: 2024, Номер 36(37)

Опубликована: Май 30, 2024

Stretchable organic photovoltaics (OPVs) have attracted significant attention as promising power sources for wearable electronic systems owing to their superior robustness under repetitive tensile strains and good compatibility. However, reconciling a high power-conversion efficiency reasonable flexibility is tremendous challenge. In addition, the development of stretchable OPVs must be accelerated satisfy increasing requirements niche markets mechanical robustness. OPV devices can classified either structurally or intrinsically stretchable. This work reviews recent advances in OPVs, including design mechanically robust transparent electrodes, photovoltaic materials, devices. Initially, an overview characteristics research progress areas provided. Subsequently, into flexible electrodes that directly affect performances summarized analyzed. Overall, this review aims provide in-depth understanding intrinsic properties highly efficient deformable active while also emphasizing advanced strategies simultaneously improving performance layer, material design, multi-component settings, structural optimization.

Язык: Английский

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Guest Acceptors with Lower Electrostatic Potential in Ternary Organic Solar Cells for Minimizing Voltage Losses

Advanced Materials, Год журнала: 2024, Номер 36(26)

Опубликована: Апрель 5, 2024

The ternary strategy, in which one guest component is introduced into host binary system, considered to be of the most effective ways realize high-efficiency organic solar cells (OSCs). To date, there no efficient method predict effectiveness components OSCs. Herein, three compositions (i.e., ANF-1, ANF-2 and ANF-3) with different electrostatic potential (ESP) are designed synthesized by modulating electron-withdrawing ability terminal groups through density functional theory simulations. effects introduction system (D18:N3) on photovoltaic properties investigated. theoretical experimental studies provide a key rule for acceptor OSCs improve open-circuit voltage, that is, larger ESP difference between acceptor, stronger intermolecular interactions higher miscibility, improves luminescent efficiency blend film electroluminescence quantum yield (EQE

Язык: Английский

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Simultaneous enhancement of efficiency, stability and stretchability in binary polymer solar cells with a three-dimensional aromatic-core tethered tetrameric acceptor

National Science Review, Год журнала: 2025, Номер 12(3)

Опубликована: Янв. 21, 2025

Polymer solar cells (PSCs) leverage blend films from polymer donors and small-molecule acceptors (SMAs), offering promising opportunities for flexible power sources. However, the inherent rigidity crystalline nature of SMAs often embrittle donor in constructed bulk heterojunction structure. To address this challenge, we improved stretchability by designing synthesizing a tethered giant tetrameric acceptor (GTA) with increased molecular weight that promotes entanglement individual SMA units. The key to design is using tetraphenylmethane as linking core create three-dimensional high C2 symmetry structure, which successfully regulates their aggregation relaxation behavior. With GTA acceptor, its PM6 exhibit significantly stretchability, nearly 150% increase crack onset strain value compared PM6:Y6. Moreover, PSCs achieve an efficiency up 18.71% demonstrate outstanding photostability, maintaining >90% initial conversion after operating over 1000 hours. Our findings specifically aligning weights more closely those counterparts, can enhanced without compromising morphological stability or device efficiency.

Язык: Английский

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Exploring the impact of cyano substitutions in non-fullerene acceptors for enhanced organic solar cell performance: A DFT and TD-DFT investigation

Computational and Theoretical Chemistry, Год журнала: 2025, Номер 1246, С. 115102 - 115102

Опубликована: Фев. 3, 2025

Язык: Английский

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Pressure‐Controlled Nanoimprint Lithography Achieves over 20% Efficiency in Organic Solar Cells

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 9, 2025

Abstract Nanoimprint lithography (NIL) offers unprecedented control over active layer morphology in organic solar cells (OSCs), yet optimal processing conditions remain critical for maximizing device performance. Here, pressure‐dependent NIL fabrication of ordered interdigitated heterojunction structures is demonstrated D18/L8‐BO‐based OSCs, achieving exceptional performance through systematic pressure optimization. At an 50 bar, devices exhibit record‐setting metrics: 20.08% power conversion efficiency, 27.34 mA cm −2 short‐circuit current density, and 80.34% fill factor. The NIL‐patterned layers form well‐defined, solvent‐resistant nanopillar arrays (8.7–29 nm height) with enhanced light‐harvesting capabilities. Detailed characterization reveals improved molecular ordering both donor acceptor phases, while advanced spectroscopy demonstrates accelerated charge transfer dynamics reduced exciton dissociation diffusion times. This pressure‐optimized strategy simultaneously enhances the optical, morphological, electronic properties establishing a promising pathway toward commercial‐scale photovoltaic technology.

Язык: Английский

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Organic solar cells based on molecular perylene diimides-type nonfullerene acceptors: achievements, challenges and the future

Science China Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

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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High‐Performance Photoactive Polymers: Innovations in Ternary Polymerization for Solar Applications

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 2, 2025

Abstract In recent years, polymer solar cells (PSCs) have achieved rapid progress, with power conversion efficiencies (PCEs) reaching up to 20.25%, driven by significant advancements in device fabrication and active‐layer materials. The ternary polymerization strategy has proven be a straightforward effective approach for developing high‐performance photoelectric polymers incorporating third monomer into the backbone. This incorporation effectively optimizes intrinsic properties, including UV–vis absorption, energy levels, solubility, crystallinity, morphology, charge transfer, mechanical robustness, batch‐to‐batch reproducibility, stability. review highlights latest designing photoactive copolymers (both donors acceptors), particular focus on stability, potential applications commercial development. aim is provide valuable guidance development of materials using strategy.

Язык: Английский

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