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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20.6% Efficiency Organic Solar Cells Enabled by Incorporating a Lower Bandgap Guest Nonfullerene Acceptor Without Open‐Circuit Voltage Loss

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 28, 2025

Abstract Simultaneously mitigating both photovoltage and photocurrent losses is crucial for organic solar cells (OSCs) to approach the Shockley–Queisser limit of ideal efficiency. Incorporating a narrower bandgap nonfullerene acceptor (NFA) as guest component into host donor:NFA system broadens absorption spectrum. However, this can also increase nonradiative decay rate according energy‐gap law. In work, ternary OSCs are constructed by combining narrow AQx‐2F (as NFA) with lower eC9 NFA), significantly enhancing generation without compromising photovoltage. The addition acts crystallization inducer, extending period increasing ordered packing distance. This leads suppressed trap states, elevated dielectric constant, prolonged exciton lifetime, balanced hole/electron transport, reduced recombination loss. Consequently, optimized D18:AQx‐2F:eC9 achieve champion power conversion efficiency (PCE) 20.6% high open‐circuit voltage 0.937 V, short‐circuit current density 27.2 mA cm −2 fill factor 80.8%, validated an independently certified PCE 20.0%, establishing new benchmark bulk heterojunction OSCs. work demonstrates effective method simultaneously mitigate losses, paving way high‐performance

Язык: Английский

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The Phase Separation Control in All‐Polymer Solar Cells

SusMat, Год журнала: 2025, Номер unknown

Опубликована: Март 17, 2025

ABSTRACT All‐polymer solar cells (all‐PSCs) are of interest owing to their unique advantages, including remarkably improved device stability and exceptional mechanical stretchability. Over recent years, there has been a notable increase in the power conversion efficiency (PCE) all‐PSCs, largely attributed advancements morphology control active layer. Notably, domain size is paramount importance as it impacts critical factors such exciton dissociation, charge transport, collection. However, low glass transition temperature conjugated polymers, coupled with minimal change mixing entropy, often results an excessive degree phase separation. Consequently, essential comprehend evolution separation develop strategies regulate size. In this review, we elucidate key parameters that contribute enhancement present qualitative quantitative characterization techniques for Building on foundation, introduce principles regulating sizes, encompassing crystallinity, miscibility, molecular conformation from thermodynamic perspective, well film‐forming kinetics crystallization sequence kinetic perspective. Lastly, offer insights into current challenges potential future prospects all‐PSCs.

Язык: Английский

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In‐Depth Investigation of Morphology Evolution in Highly Efficient Pseudo‐Planar Heterojunction All‐polymer Organic Photovoltaics

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 16, 2025

Abstract Pseudo‐planar heterojunction (PPHJ) structure using sequential deposition is an effective method for achieving high‐efficiency organic photovoltaics (OPVs). The crystallization and phase separation behavior during film‐forming process intricately related to morphology with PPHJ structure. Despite this, the relationship between these two factors remains ambiguous, thereby impeding further improvements in performance. To tackle this challenge, PM6 PY‐DT all‐polymer systems as models are utilized, combine theoretical calculations, situ spectroscopy, morphological characterization elucidate aforementioned relationship. Thermodynamically, can effectively suppress van der Waals forces, increase crystallinity of PM6, promote matching crystallinity. Kinetically, rate notably faster more sustained, facilitating development interpenetrating network enhanced Furthermore, driven by crystallization‐induced‐phase separation, characterized minimal intermixed content substantial domain size. Concurrently, layer swells a limited extent, downward diffusion PY‐DT, which promotes formation vertical Ultimately, favorable achieved optimizing process, resulting power conversion efficiency (PCE) 18.08%, highest PCEs reported binary OPVs based on date.

Язык: Английский

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In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells

National Science Review, Год журнала: 2024, Номер 11(12)

Опубликована: Ноя. 4, 2024

ABSTRACT Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells (all-PSCs), a promising photovoltaic technology towards multi-scenario application. Although the nano-fibrillar network of active layer induced by treatment is confirmed as key factor power conversion efficiency (PCE) all-PSCs, its formation mechanism not clearly revealed, lack precise and convincing real-time observation crystallization phase separation during liquid-to-solid transition process spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering (GIWAXS/GISAXS) screening that reveals fact naphthalene derived solid additives can suppress aggregation polymer acceptor (PY-IT) at beginning stage spin coating, which provides sufficient time space donor (PM6) to form fibril structure. Moreover, guided this knowledge, ternary system proposed, achieves cutting-edge level PCEs both small-area (0.04 cm2) (also decent operational stability) large-area (1 devices.

Язык: Английский

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Amide-Based Cathode Interfacial Layer with Dual-Modification Mechanisms Enables Stable Organic Solar Cells with High Efficiency Achieving 20%

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

The cathode interfacial layers (CILs) play a critical role in the performance and long-term stability of organic solar cells (OSCs). While amine-based CILs have been successful reducing work function metal electrodes, they can also promote decomposition acceptor materials, compromising OSCs. To address this challenge further improve device performance, we innovatively designed synthesized amide-functionalized perylene diimide (PDI)-Leu-am as dopant-free CIL molecule. Notably, PDI-Leu-am effectively mitigates decomposition, significantly improving photostability thermal Moreover, it demonstrates dual-modification capabilities at active layer/cathode interface, facilitating electron extraction from layer while lowering electrode's function. Encouragingly, dual modification mechanism refined Ohmic contact, leading to remarkable power conversion efficiency (PCE) up 20%. This breakthrough opens promising avenues for practical deployment OSCs lays robust foundation development high-performance, enduring, cost-efficient interface materials.

Язык: Английский

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A systematic investigation on pyridine derived solid additives inducing fibrillar morphology for highly efficient organic solar cells with over 20 % efficiency

Materials Science and Engineering R Reports, Год журнала: 2025, Номер 164, С. 100977 - 100977

Опубликована: Март 18, 2025

Язык: Английский

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Dual Additive‐Assisted Layer‐by‐Layer Processing for 19.59% Efficiency Quasi‐Bulk Heterojunction Organic Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 22, 2024

Abstract The ideal vertical phase separation active layer morphology is crucial for the photoelectric conversion of organic solar cells. In this work, a layer‐by‐layer sequential deposition method used to prepare D18/L8‐BO‐based cells and dual additives strategy adopted construct layer. Additive DIM regulates crystallization D18 layer, additive DIO induces L8‐BO diffuse into interior form composition distribution with large donor/acceptor interpenetrated regions. improvement induced by promote exciton generation dissociation, shorten charge transfer distance, improve carrier dynamics. With improved transport performance suppressed recombination, short‐circuit current density fill factor D18/L8‐BO quasi‐bulk heterojunction are simultaneously, power efficiency boosted significantly from 18.21% 19.59%. Moreover, photovoltaic further verified in D18/Y6 PM6/L8‐BO‐based cells, which implies generalizability additive‐assisted ‐sequential method.

Язык: Английский

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Novel Long-Conjugated Backbone-Based Non-Fullerene Acceptors for Efficient and Eco-Friendly Ternary Organic Solar Cells

Sustainability, Год журнала: 2025, Номер 17(2), С. 512 - 512

Опубликована: Янв. 10, 2025

Organic solar cells (OSCs) are made from carbon-rich organic compounds with low environmental impacts, unlike the silicon in traditional panels. Some of these materials can be broken down and reprocessed, enabling recovery valuable components. Specifically, active-layer that make up OSCs designed sustainability mind. However, it is important to note practical active used for commercialization still an area research development due their efficiency/stability processability. Herein, we synthesized three A-D-A’-D-A-type long-conjugated non-fullerene acceptors (NFAs) by incorporating various electron-withdrawing groups into benzothiadiazole-diindacenodithiophene core. These NFAs, changing end-capping groups, exhibit not only distinct physical, optical, electrochemical properties, but also differences crystallinity exciton dissociation. As a result, they exhibited significant photovoltaic performance PM6 donor-based binary devices. The introduction small amounts NFAs as third component PM6:BTP-eC9 blend significantly enhanced its photon harvesting capabilities influenced charge transfer dynamics. Finally, achieved remarkable power conversion efficiency nearly 17% utilizing eco-friendly solvent. This study provides insights efficient OSCs.

Язык: Английский

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Optimizing interface properties of perylene-diimide-based cathode interlayer material by reducing 2-hydroxyethyl groups to achieve organic solar cells with efficiency over 19%

Nano Energy, Год журнала: 2025, Номер unknown, С. 110799 - 110799

Опубликована: Фев. 1, 2025

Язык: Английский

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