1,5-Diiodocycloctane: a cyclane solvent additive that can extend the exciton diffusion length in thick film organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(5), С. 1916 - 1930

Опубликована: Янв. 1, 2024

The addition of cyclane 1,5-diiodocycloctane (DICO) provides critical roles in extending exciton diffusion length within active layer, consequently contributing to the improvement power conversion. efficiency thick film organic solar cells.

Язык: Английский

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Intrinsic Role of Volatile Solid Additive in High‐Efficiency PM6:Y6 Series Nonfullerene Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(24)

Опубликована: Март 16, 2023

Organic nonfullerene solar cells (ONSCs) have made unprecedented progress; however, morphology optimization of ONSCs is proven to be particularly challenging relative classical fullerene-based devices. Here, a novel volatile solid additive (VSA), 2-hydroxy-4-methoxybenzophenone (2-HM), reported for achieving high-efficiency ONSCs. 2-HM functions as universal morphology-directing agent several well-known PM6:Y6 series blends, viz. PM6:Y6, PM6:BTP-eC9, PM6:L8-BO, leading best efficiency 18.85% at the forefront binary VSAs recently emerged, while intrinsic kinetics still unclear. Herein, set in situ and ex characterizations employed first illustrate molecule-aggregate-domain transition dynamic process assisted by VSA. More specifically, role individual donor PM6 acceptor Y6 systems unlocked, function altering bulk heterojunction blends further revealed enhanced photovoltaic performance. It believed that achievement brings not only deep insight into emerging additive, but also new hope improve molecular ordering, film microstructure, relevant performance

Язык: Английский

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Control of the Crystallization and Phase Separation Kinetics in Sequential Blade‐Coated Organic Solar Cells by Optimizing the Upper Layer Processing Solvent

Advanced Energy Materials, Год журнала: 2023, Номер 13(7)

Опубликована: Янв. 1, 2023

Abstract Sequential deposition of the active layer in organic solar cells (OSCs) is favorable to circumvent existing drawbacks associated with controlling microstructure bulk‐heterojunction (BHJ) device fabrication. However, how processing solvents impact on morphology during sequential processes still poorly understood. Herein, high‐efficiency OSCs are fabricated by a blade coating (SBC) through optimization evolution process induced solvents. It demonstrated that performance highly dependent solvent upper layer. In situ characterizations reveal an obvious liquid–solid phase separation can be identified chlorobenzene D18 layer, corresponding larger separation. During chloroform (CF) proper aggregation rate Y6 and intermixing lower layers results enhanced crystallinity acceptor. This facilitates efficient exciton dissociation charge transport inhibited recombination D18/CF‐based devices, contributing superior 17.23%. These highlight importance for SBC strategy suggest great potential achieving optimized using strategy.

Язык: Английский

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Isomerized Green Solid Additive Engineering for Thermally Stable and Eco‐Friendly All‐Polymer Solar Cells with Approaching 19% Efficiency

Advanced Materials, Год журнала: 2023, Номер 35(49)

Опубликована: Окт. 12, 2023

Laboratory-scale all-polymer solar cells (all-PSCs) have exhibited remarkable power conversion efficiencies (PCEs) exceeding 19%. However, the utilization of hazardous solvents and nonvolatile liquid additives poses challenges for eco-friendly commercialization, resulting in trade-off between device efficiency operation stability. Herein, an innovative approach based on isomerized solid additive engineering is proposed, employing volatile dithienothiophene (DTT) isomers to modulate intermolecular interactions facilitate molecular stacking within photoactive layers. Through elucidating underlying principles DTT-induced polymer assembly level, a PCE 18.72% achieved devices processed with environmentally benign solvents, ranking it among highest record values all-PSCs. Significantly, such superiorities DTT-isomerized strategy afford excellent compatibility large-area blade-coating techniques, offering promising pathway industrial-scale manufacturing Moreover, these demonstrate enhanced thermal stability extrapolated T80 lifetime 14 000 h, further bolstering their potential sustainable technological advancement.

Язык: Английский

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Impact of Intermolecular Interactions between Halogenated Volatile Solid Additives and the Nonfullerene Acceptor in Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 33(50)

Опубликована: Сен. 5, 2023

Abstract The halogenated volatile solid additives can delicately optimize the active layer morphology of organic solar cells, improving devices' performance, stability, and reproducibility. However, what type intermolecular interaction occurs between whether truly impacts donor or acceptor remains debatable. Herein, focus is on with conjugated benzene rings their influence composed PM6:Y6 as they evaporated. absorbance spectra exhibit apparent red‐shift features in Y6 absorption regions, while part unaffected. theoretical calculation results reveal that stay two molecules form halogen bonds, affecting π–π aggregation properties Y6. As a result, crystalline are altered, leading to increased charge carrier mobilities, extended diffusion lengths, reduced bimolecular recombination, thus device performance. Especially when 1,3,5‐tri bromobenzene used, champion power conversion efficiency 17.9% attained, among best‐performed cells comprising PM6:Y6. findings shed light experimental guidelines for designing developing highly efficient nonfullerene cells.

Язык: Английский

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19.0% efficiency binary organic solar cells enabled by using a building block as solid additive

Nano Energy, Год журнала: 2023, Номер 119, С. 109097 - 109097

Опубликована: Ноя. 16, 2023

Язык: Английский

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Easy Isomerization Strategy for Additives Enables High‐Efficiency Organic Solar Cells

Advanced Energy Materials, Год журнала: 2023, Номер 13(22)

Опубликована: Апрель 27, 2023

Abstract The morphological features of the active layer has always been an important factor limiting efficiency organic solar cells (OSCs). Although halogen‐based additives capable forming non‐covalent bonds with molecules can effectively adjust morphology layer, inner mechanism positional isomerization on crystallization kinetics bulk heterojunction ignored, which hinders further development this technique. Herein, a new additive‐assisted optimization strategy for high‐efficiency OSCs based three isomeric is proposed, have different sites two bromine substituents benzene ring. results demonstrate that symmetrically structured smallest dipole moment, lowest steric hindrance and most uniformly distributed electrostatic potential, form more suitable interactions acceptor, resulting in reasonable molecular spatial distribution better π–π stacking behavior. For other non‐fullerene systems, additive also shows best effect optimizing aggregation stacking. This work provides guidance screening designing excellent improvement capability expected to profound influence increasing without adopting possessing complex conjugated backbones branched chains.

Язык: Английский

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Solid Additive Delicately Controls Morphology Formation and Enables High‐Performance in Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 33(49)

Опубликована: Июнь 26, 2023

Abstract Volatile solid additives are an effective strategy for optimizing morphology and improving the power conversion efficiencies (PCEs) of organic solar cells (OSCs). Much research has been conducted to understand role in active layer morphology. However, it is crucial delve deeper how affect entire evolution process, from solution state film thermal annealing stage, which remains unclear. Herein, use a highly crystalline additive, phenoxathiin (Ph), D18‐Cl:N3‐based OSCs study its impact on formation photovoltaic performance presented. Owing good miscibility with acceptor N3, Ph additive can not only extend time form state, but also provide sufficient aggregation. After annealing, volatilizes better aligned N3 molecules formed favorable hybrid Consequently, D18‐Cl:N3–based OSC exhibited outstanding PCE 18.47%, enhanced short‐circuit current 27.50 mA cm −2 fill factor 77.82%. This spurring development high‐performance using that allow fine control during development.

Язык: Английский

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Solid Additive‐Assisted Selective Optimization Strategy for Sequential Deposited Active Layers to Construct 19.16% Efficiency Binary Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 34(13)

Опубликована: Дек. 21, 2023

Abstract Volatile solid (VS)‐additives are regarded as an effective tool to manipulate morphology of sequential deposited (SD) active layers for improving power conversion efficiencies (PCEs) organic solar cells (OSCs), while the independent effect VS‐additives on donor and acceptor is often overlooked. Herein, a new VS‐additive named 2‐(2‐methoxyphenyl)benzo[ b ]thiophene (BTO) synthesized applied in SD binary PM6/L8‐BO layers. Introducing it into bottom PM6 layer (PM6 + ), BTO has low volatility longer volatilization distance, which prolongs interaction time between L8‐BO /L8‐BO film, leading over‐aggregated L8‐BO. While inserting top (L8‐BO fast evaporation excellent dipole help enhance molecular absorption, crystallinity, ordered packing system. Therefore, optimized with proper phase separation achieved increase exciton dissociation charge transfer properties, restrain recombination energy loss OSCs, yielding impressive PCE over 19%. Furtherly, using D18 instead PM6, SD‐systems offer record‐high 19.16%. The developed selective optimization strategy provides deep insight working mechanism boosting OSCs.

Язык: Английский

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Thermodynamic Phase Transition of Three‐Dimensional Solid Additives Guiding Molecular Assembly for Efficient Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(40)

Опубликована: Авг. 16, 2023

Abstract Fine‐tuning the thermodynamic self‐assembly of molecules via volatile solid additives has emerged to be an effective way construct high‐performance organic solar cells. Here, three‐dimensional structured have been designed and applied facilitate formation organized molecular assembly in active layer. By means systematic theory analyses film‐morphology characterizations based on four candidates, we preselected optimal one, 4‐fluoro‐ N,N ‐diphenylaniline (FPA), which possesses good volatility strong charge polarization. The solids can induce packing layers intermolecular interactions subsequently provide sufficient space for self‐reassembly during transition process. Benefitting from optimized morphology with improved transport reduced energy disorder FPA‐processed devices, high efficiencies over 19 % were achieved. strategy inducing ordered structure represents a practical approach rational control highly efficient contributing deeper insights into structural design additives.

Язык: Английский

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