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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Halogenated Nonfused Ring Electron Acceptor for Organic Solar Cells with a Record Efficiency of over 17%

Advanced Materials, Год журнала: 2023, Номер 36(4)

Опубликована: Ноя. 23, 2023

Abstract Three nonfused ring electron acceptors (NFREAs), namely, 3TT‐C2‐F , 3TT‐C2‐Cl and 3TT‐C2 are purposefully designed synthesized with the concept of halogenation. The incorporation F or/and Cl atoms into molecular structure ( ) enhances π–π stacking, improves mobility, regulates nanofiber morphology blend films, thus facilitating exciton dissociation charge transport. In particular, films based on D18: demonstrate a high an extended diffusion distance, well‐formed network. These factors contribute to devices remarkable power conversion efficiency 17.19%, surpassing that (16.17%) (15.42%). To best knowledge, this represents highest achieved in NFREA‐based up now. results highlight potential halogenation NFREAs as promising approach enhance performance organic solar cells.

Язык: Английский

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Over 18.8% Efficiency of Layer‐By‐Layer Organic Photovoltaics Enabled by Ameliorating Exciton Utilization in Acceptor Layer

Advanced Functional Materials, Год журнала: 2024, Номер 34(16)

Опубликована: Янв. 2, 2024

Abstract The layer‐by‐layer (LbL) organic photovoltaics (OPVs) are constructed with wide‐bandgap donor PM1 and narrow‐bandgap acceptor L8‐BO. exciton utilization near cathode is still challenging considering restricted diffusion distance of excitons inability for transferring energy from L8‐BO to PM1. Herein, incorporation into layer (DIA) strategy employed improve cathode. efficiency LbL OPVs can be improved 18.02% 18.81% by incorporating 10 wt% layer, which closely associated efficient separation originated more adequate donor/acceptor interface faster charge transfer, as evidenced magneto‐photocurrent transient absorption results. in situ test morphological characterization clarify that molecular packing property benefited prolonged aggregation nucleation time assisted DIA strategy, contributing transport inhibited recombination active layers. thickness insensitive also induced indicated PCE retention value (82.2% vs. 74.0%) PM1/L8‐BO:PM1 PM1/L8‐BO when increased ≈180 nm. This work demonstrates the effectiveness improving tolerance OPVs.

Язык: Английский

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Halogenation Strategy of Thiophene Derived Solvent Additives Enables Optimized Morphology for Organic Solar Cells with 19.17% Efficiency

Advanced Functional Materials, Год журнала: 2024, Номер 34(19)

Опубликована: Янв. 14, 2024

Abstract As simple and versatile tools, additives have been widely used to refine active layer morphology played a crucial role in boosting the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, three novel solvent named Th‐FSi, Th‐ClSi, Th‐BrSi with same backbone 2,5‐bis(trimethylsilyl)thiophene are designed synthesized by substituting different halogens fluorine, chlorine, bromine, respectively. Notably, Th‐ClSi exhibits more significant dipole moment engages non‐covalent interactions small‐molecule acceptor (SMA) L8‐BO, which slight adjustments intermolecular interaction, crystallinity, molecular packing PM6:L8‐BO layer. Consequently, OSCs incorporating outperform their Th‐FSi counterparts photo‐capturing, reduced energy loss, superior exciton dissociation, charge transfer properties, out‐coming yields an enhanced PCE 18.29%. Moreover, integrating near‐infrared absorbing SMA (BTP‐eC9) guest into matrix, absorption spectrum span 880–930 nm, resultant ternary achieve commendable 19.17%, ranking among highest efficiencies reported date is expanded. These findings underscore promise halogenated thiophene‐based as potent avenue for morphological fine‐tuning consequent enhancement OSCs.

Язык: Английский

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Impact of Electrostatic Interaction on Vertical Morphology and Energy Loss in Efficient Pseudo‐Planar Heterojunction Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(18)

Опубликована: Янв. 27, 2024

Abstract Although a suitable vertical phase separation (VPS) morphology is essential for improving charge transport efficiency, reducing recombination, and ultimately boosting the efficiency of organic solar cells (OSCs), there lack theoretical guidance on how to achieve ideal morphology. Herein, relationship between molecular structure VPS pseudo‐planar heterojunction (PPHJ) OSCs established by using surface electrostatic potential (ESP) as bridge. The morphological evolution mechanism revealed studying four binary systems with vary difference (∆ESP) donors (Ds) acceptors (As). findings manifest that ∆ESP increases, active layer more likely form well‐mixed phase, while smaller favors Interestingly, it also observed larger leads enhanced miscibility Ds As, resulting in higher non‐radiative energy losses (ΔE 3 ). Based these discoveries, ternary PPHJ device meticulously designed an appropriate obtain better lower ΔE , impressive 19.09% achieved. This work demonstrates optimizing ΔESP, not only formation can be controlled, but reduced, paving way further boost OSC performance.

Язык: Английский

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Over 19.2% efficiency of layer-by-layer organic photovoltaics enabled by a highly crystalline material as an energy donor and nucleating agent

Energy & Environmental Science, Год журнала: 2024, Номер 17(14), С. 5173 - 5182

Опубликована: Янв. 1, 2024

By introducing highly crystalline material D18A into donor layer acting as energy and nucleating agent, an optimal PCE of 19.25% was achieved for PM1 : D18A/L8-BO based OPVs.

Язык: Английский

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Eco-friendly solvent-processed layer-by-layer ternary all-polymer solar cells exhibiting over 18.5% efficiency

Chemical Engineering Journal, Год журнала: 2024, Номер 493, С. 152558 - 152558

Опубликована: Май 25, 2024

Язык: Английский

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Over 17.1% or 18.2% Efficiency of Layer-by-Layer All-Polymer Solar Cells via Incorporating Efficient Pt Complexes as Energy Donor Additive

ACS Materials Letters, Год журнала: 2024, Номер 6(7), С. 2964 - 2973

Опубликована: Июнь 12, 2024

Layer-by-layer (LbL) all-polymer solar cells (APSCs) are constructed with or without the incorporation of a Pt complex F-Pt as an energy donor additive in acceptor layer. The power conversion efficiency (PCE) LbL APSCs can be enhanced from 15.86% to 17.14% through introducing 0.2 wt % PY-IT layer, originating efficient transfer PM6 and PY-IT. well confirmed spectral overlapping between photoluminescence (PL) spectra absorption PY-IT, prolonged PL lifetime according transient time-resolved blend films. universality strategy further PBQx-TCl/PY-DT based APSCs, PCE increased 17.57% 18.29% by incorporating into PY-DT

Язык: Английский

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High‐Reproducibility Layer‐by‐Layer Non‐Fullerene Organic Photovoltaics with 19.18% Efficiency Enabled by Vacuum‐Assisted Molecular Drift Treatment

Advanced Energy Materials, Год журнала: 2024, Номер 14(11)

Опубликована: Янв. 28, 2024

Abstract The thin film deposition engineering of layer‐by‐layer (LbL) non‐fullerene organic solar cells (OSCs) favors vertical phase distributions donor:acceptor (D:A), effectively boosting the power conversion efficiency (PCE). However, previous strategies mainly aimed at optimizing morphology LbL films, and paid limited attention to reproducibility device performance. To achieve high performance maintain reproducibility, a strategy for hierarchical manipulation in OSCs is developed. A series devices are fabricated by introducing vacuum‐assisted molecular drift treatment (VMDT) donor or acceptor layer individually simultaneously elucidate functionalities this treatment. Essentially, VMDT provides an extended driving force manipulate molecules, resulting well‐defined distribution ordered packing. These enhancements facilitate improvement D:A interface area charge transport channel, ultimately contributing impressive PCEs 19.18% from 18.27% devices. More importantly, using overcomes notorious batch‐dependent heat degradation issues OSCs, leading excellent batch‐to‐batch enhanced stability This reported method promising available industrial laboratory use controllably OSCs.

Язык: Английский

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Non-fullerene acceptors with high crystallinity and photoluminescence quantum yield enable >20% efficiency organic solar cells

Nature Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Язык: Английский

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