Achieving 20.8% organic solar cells via additive-assisted layer-by-layer fabrication with bulk p-i-n structure and improved optical management

Joule, Год журнала: 2024, Номер 8(11), С. 3153 - 3168

Опубликована: Авг. 29, 2024

Язык: Английский

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Dynamic hydrogen-bonding enables high-performance and mechanically robust organic solar cells processed with non-halogenated solvent

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Янв. 17, 2025

Developing active-layer systems with both high performance and mechanical robustness is a crucial step towards achieving future commercialization of flexible stretchable organic solar cells (OSCs). Herein, we design synthesize series acceptors BTA-C6, BTA-E3, BTA-E6, BTA-E9, featuring the side chains hexyl, 3, 6, 9 carbon-chain ethyl ester end groups respectively. Benefiting from suitable phase separation vertical distribution, PM6:BTA-E3-based OSCs processed by o-xylene exhibit lower energy loss improved charge transport characteristic achieve power conversion efficiency 19.92% (certified 19.57%), which stands as highest recorded value in binary green solvents. Moreover, due to additional hydrogen-bonding provided chain, enhanced stretchability thermal stability. Our work reveals significance dynamic improving photovoltaic performance, robustness, morphological stability OSCs.

Язык: Английский

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Precisely Regulating Intermolecular Interactions and Molecular Packing of Nonfused‐Ring Electron Acceptors via Halogen Transposition for High‐Performance Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(34)

Опубликована: Июнь 5, 2024

The structure of molecular aggregates is crucial for charge transport and photovoltaic performance in organic solar cells (OSCs). Herein, the intermolecular interactions aggregated structures nonfused-ring electron acceptors (NFREAs) are precisely regulated through a halogen transposition strategy, resulting noteworthy transformation from 2D-layered to 3D-interconnected packing network. Based on 3D pathway, binary ternary devices deliver outstanding power conversion efficiencies (PCEs) 17.46 % 18.24 %, respectively, marking highest value NFREA-based OSCs.

Язык: Английский

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Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non-radiative recombination (ΔEnr) that occurs due exciton-vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y-SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small ΔEnr 0.184 eV, much lower than those Y-SS Y-SSe devices with weaker interactions. These achievements not only set record selenium-containing OSCs, but also mark lowest reported value among high-performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single-junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low-energy-loss high-efficiency

Язык: Английский

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The revival of 4H-cyclopenta[2,1-b:3,4-b′]dithiophene (CPDT) driven by low-cost and high-performance nonfused-ring electron acceptors

Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(29), С. 17973 - 17991

Опубликована: Янв. 1, 2024

This review comprehensively summarizes the development history of CPDT-based organic photovoltaic materials, which contributes to a deeper understanding revival CPDT driven by low-cost acceptors.

Язык: Английский

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Using Post‐Treatment Additives for Crystal Modulation and Interface Passivation Enables the Fabrication of Efficient and Stable Perovskite Solar Cells in Air

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 6, 2024

Abstract High‐performance perovskite solar cells (PSCs) fabricated in ambient air are considered inevitable for low‐cost commercial manufacturing. However, passivating film defects and controlling the crystallization process critical achieving high performance PSCs. This study proposes using novel 2D material MBene green antisolvent to simultaneously modulate passivation of perovskites. facilitates uncoordinated Pb 2+ ions, thereby enhancing formation energy vacancies within adjusting level structure. Moreover, increases nucleation sites perovskite, significantly extending crystal growth improving crystallinity, reducing non‐radiative recombination. Consequently, champion devices treated with achieve a power conversion efficiency (PCE) 24.22% when air, exhibit superior humidity long‐term stability. Furthermore, PSCs added significant stability under various environmental conditions, including heat. The results lay foundation development materials photovoltaics, revealing their mechanism as new type perovskites, providing insights industrially producing efficient stable cells.

Язык: Английский

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Jamming Giant Molecules at Interface in Organic Photovoltaics to Improve Performance and Stability

Advanced Materials, Год журнала: 2024, Номер 36(52)

Опубликована: Окт. 7, 2024

A novel approach for depositing the giant molecule acceptor (GMA) at donor-acceptor interface to enhance efficiency and stability of organic photovoltaic (OPV) devices through a designed interface-enhanced layer-by-layer device fabrication protocol is proposed. The DQx-Ph mixed with polymer donor in bottom layer form fibril phase phase, followed by subsequent deposition main L8-BO. L8-BO solution swells alters localized morphology mixing introducing fibrillar crystallization pushing molecules outwards interfaces. Through this approach, optoelectronic property bulk heterojunction are optimized. This configuration maintains superior transport properties while integrating high open-circuit voltage characteristics DQx-Ph. Additionally, exciton dissociation charge generation simultaneously enhanced, suppressed energy losses. power conversion 19.9% improved operational achieved, underscoring importance GMA jamming advancing OPV technology. study provides new insights into development ancillary materials overcome critical limitations OPV, revealing innovative approaches technologies.

Язык: Английский

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Synergistically Halogenated and Methoxylated Thiophene Additive Enables High‐Performance Organic Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

Abstract Morphology control plays a key role for improving efficiency and stability of bulk heterojunctions (BHJ) organic solar cells (OSCs). Halogenation methoxylation are two separate ways successfully adopted in additives morphology optimization. In this work, these strategies combined together. A series halogenated methoxylated thiophenes is designed synthesized as volatile to the evolution BHJ morphology. Specifically, addition 2,5‐diiodo‐3,4‐dimethoxythiophene (MT‐I) prominently improves performance photostability OSCs. Computational simulations reveal noncovalent interactions MT‐I with active layer materials that corresponds inhibition excessive aggregation behavior PM6 Y6 during film‐forming process, facilitating favorable phase separation enhanced molecular stacking. Consequently, PM6:Y6‐based binary OSCs treatment achieves high PCE 17.93%. Furthermore, demonstrates broad feasibility across diverse high‐efficiency OSCs, leading superior photovoltaic (PCE over 18%). This study offers valuable guidance design application high‐performance future endeavors.

Язык: Английский

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Minimizing Interfacial Energy Losses with Carbon Dot Bifacial Modification Layers for High‐Efficiency and Stable Perovskite LEDs

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 16, 2025

Abstract Perovskite light‐emitting diodes (PeLEDs) have reached near‐unity photoluminescent quantum yields (PLQYs), but further improvements in electroluminescent efficiency are constrained by interfacial energy losses between the emissive layer and charge transport layers. In this study, multifunctional carbon dot organic frameworks (CDOFs) introduced as a dual‐interface modification material for perovskite layer. This approach effectively passivates both upper buried interfaces, boosting PLQY to nearly 100% enabling an external of 28.0%. The CDOFs also facilitate balanced injection, achieving low turn‐on voltage only 1.9 V, significantly below bandgap voltage. Additionally, exceptional defect passivation imparted bolsters structural stability, T 50 operational lifetime 81.7 min at initial ultrahigh luminance 10 000 cd m −2 , with no detectable Joule heating. study underscores potential advancing PeLED performance.

Язык: Английский

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Advanced Strategy for High-Performance A-D-A′-D-A Type Non-Fused Ring Electron Acceptors with Nitrogen Heterocyclic Cores

The Journal of Physical Chemistry B, Год журнала: 2025, Номер 129(11), С. 3109 - 3119

Опубликована: Март 6, 2025

The development of nonfused ring electron acceptors (NFREAs) has garnered significant attention due to their simplified molecular design and cost-effectiveness. Recent advancements have pushed the power conversion efficiency (PCE) NFREAs beyond 19%. Despite these advantages, most adopt A-D-A structures, where electron-donating core is typically a benzene substituted with fluorine or alkoxy groups. This restricts tunability energy levels, selection substituents for rings as central units relatively constrained, which hampers further optimization material properties. In this work, we designed three A-D-A′-D-A structured fully featuring distinct nitrogen heterocyclic cores: linear-shaped TT, star-shaped TYT, quad-rotor-shaped TTVP. nitrogen-containing aromatic units, strong electron-withdrawing groups, enable precise tuning levels. Moreover, cores enhance rigidity, facilitating efficient π–π stacking improving mobility. Although share identical π-bridges terminal unique exert divergent effects on photovoltaic performance. Theoretical calculations reveal that TT TTVP exhibit higher affinity, greater absorption intensity, lower exciton binding energy, mobility compared high-performance reference NFREA, TBT-26. Notably, TTVP, an four exhibits exceptional electronic It achieves highest narrowest bandgap 1.76 eV, predicted 4.43 × 10–4 cm2 V–1 s–1, surpassing These findings underscore potential in diversifying NFREA advancing next-generation NFREAs.

Язык: Английский

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