Approaching 20% Efficiency in Ortho‐Xylene Processed Organic Solar Cells by a Benzo[a]phenazine‐Core‐Based 3D Network Acceptor with Large Electronic Coupling and Long Exciton Diffusion Length

Advanced Materials, Год журнала: 2024, Номер 36(41)

Опубликована: Авг. 13, 2024

Abstract High‐performance organic solar cells often rely on halogen‐containing solvents, which restrict the photovoltaic industry. Therefore, it is imperative to develop efficient materials compatible with halogen‐free solvents. Herein, a series of benzo[ ]phenazine (BP)‐core‐based small‐molecule acceptors (SMAs) achieved through an isomerization chlorination strategy presented, comprising unchlorinated NA1, 10‐chlorine substituted NA2, 8‐chlorine NA3, and 7‐chlorine NA4. Theoretical simulations highlight NA3's superior orbit overlap length tight molecular packing, attributed interactions between end group BP unit. Furthermore, NA3 demonstrates dense 3D network structures record electronic coupling 104.5 meV. These characteristics empower ortho‐xylene ( o ‐XY) processed PM6:NA3 device power conversion efficiency (PCE) 18.94%, surpassing PM6:NA1 (15.34%), PM6:NA2 (7.18%), PM6:NA4 (16.02%). Notably, significantly lower PCE in excessive self‐aggregation NA2 ‐XY. Importantly, incorporation D18‐Cl into binary blend enhances crystallographic ordering increases exciton diffusion donor phase, resulting ternary 19.75% (certified as 19.39%). findings underscore significance incorporating new electron‐deficient units design SMAs tailored for environmentally benign solvent processing 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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Precise Methylation Yields Acceptor with Hydrogen‐Bonding Network for High‐Efficiency and Thermally Stable Polymer Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 63(6)

Опубликована: Дек. 15, 2023

Abstract Utilizing intermolecular hydrogen‐bonding interactions stands for an effective approach in advancing the efficiency and stability of small‐molecule acceptors (SMAs) polymer solar cells. Herein, we synthesized three SMAs (Qo1, Qo2, Qo3) using indeno[1,2‐ b ]quinoxalin‐11‐one (Qox) as electron‐deficient group, with incorporation a methylation strategy. Through crystallographic analysis, it is observed that two Qox‐based methylated (Qo2 exhibit multiple hydrogen bond‐assisted 3D network transport structures, contrast to 2D structure gem‐dichlorinated counterpart (Qo4). Notably, Qo2 exhibits stronger compared Qo3. Consequently, PM6 : device realizes highest power conversion (PCE) 18.4 %, surpassing efficiencies devices based on Qo1 (15.8 %), Qo3 (16.7 Qo4 (2.4 %). This remarkable PCE can be primarily ascribed enhanced donor‐acceptor miscibility, more favorable medium structure, efficient charge transfer collection behavior. Moreover, demonstrates exceptional thermal stability, retaining 82.8 % its initial after undergoing annealing at 65 °C 250 hours. Our research showcases precise methylation, particularly targeting formation tune crystal packing patterns, represents promising strategy molecular design stable SMAs.

Язык: Английский

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Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

Energy & Environmental Science, Год журнала: 2024, Номер 17(14), С. 4944 - 4967

Опубликована: Янв. 1, 2024

Quinoxaline-based nonfullerene acceptors show highly tunable photoelectric properties and superior performance for sunlight utilization enabled by their powerful core-functionalization ability.

Язык: Английский

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C-Shape or S-Shape? The Molecular Geometry Control of Fused-Ring Nonfullerene Acceptors for Lower Energy Loss in Organic Solar Cells

ACS Energy Letters, Год журнала: 2024, Номер 9(4), С. 1786 - 1795

Опубликована: Март 28, 2024

To elucidate the pivotal influence of molecular geometry in fused-ring nonfullerene acceptors (FRNFAs) on material properties and device performance organic solar cells (OSCs), we designed synthesized two isomeric molecules C–F S–F, featuring C-shaped S-shaped geometries with acceptor–donor–acceptor conjugated framework. The alteration demonstrated negligible effects optical electrochemical properties. Significantly, single crystal X-ray crystallography analyses uncovered that exhibited a wave network packing, while S–F favored linear brick packing intermolecular end groups, different from previously reported three-dimensional (3D) stacking Y series FRNFAs. Despite absence 3D OSCs utilizing remarkable power conversion efficiency 17.0%, lower voltage loss compared to devices based S–F. This study further underscores essential role FRNFAs, providing valuable insights for future design high-performance OSCs.

Язык: Английский

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Recent development in solid additives enables high-performance organic solar cells

EnergyChem, Год журнала: 2024, Номер 6(4), С. 100129 - 100129

Опубликована: Июнь 15, 2024

Язык: Английский

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A Difluoro‐Methoxylated Ending‐Group Asymmetric Small Molecule Acceptor Lead Efficient Binary Organic Photovoltaic Blend

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 16, 2024

Abstract Developing a new end group for synthesizing asymmetric small molecule acceptors (SMAs) is crucial achieving high‐performance organic photovoltaics (OPVs). Herein, an acceptor, BTP‐BO‐4FO, featuring difluoro‐methoxylated end‐group reported. Compared to its symmetric counterpart L8‐BO, BTP‐BO‐4FO exhibits upshifted energy level, larger dipole moment, and more sequential crystallinity. By adopting two representative widely available solvent additives (1‐chloronaphthalene (CN) 1,8‐diiodooctane (DIO)), the device based on PM6:BTP‐BO‐4FO photovoltaic blend demonstrates power conversion efficiency (PCE) of 18.62% with excellent open‐circuit voltage ( V OC ) 0.933 V, which surpasses optimal result L8‐BO. The PCE realizes best efficiencies binary OPVs SMAs groups. A series investigations reveal that optimized film similar molecular packing motif fibrillar phase distribution as PM6:L8‐BO (DIO) does, resulting in comparable recombination dynamics, thus, fill factor. Besides, it found possesses efficient charge generation, yields better – J SC balance. This study provides ending enables cutting‐edge SMA‐based OPVs, enriching material library shed light further design ideas.

Язык: Английский

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Fluorinated and Methylated ortho-Benzodipyrrole-Based Acceptors Suppressing Charge Recombination and Minimizing Energy Loss in Organic Photovoltaics

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The elimination of the A' unit from -type Y6-derivatives has led to development a new class ortho-benzodipyrrole (o-BDP)-based A-DNBND-A-type NFAs. In this work, two NFAs, denoted as CFB and CMB, are designed synthesized, where electron-withdrawing fluorine atoms electron-donating methyl groups substituted on benzene ring o-BDP moiety, respectively. exhibits blue-shifted absorption spectrum, stronger intermolecular interactions, shorter π-π stacking distances, more ordered 3D packing in neat blend films, enabling it effectively suppress charge recombination PM6:CFB device showing higher PCE 16.55% with an FF 77.45%. CMB displays HOMO/LUMO energy level, smaller optical bandgap, less packing, which contributes its superior ability loss PM6:CMB high V oc 0.90 16.46%. To leverage advantages ternary PM6:Y6-16:CFB PM6:Y6-16:CMB devices fabricated. highest 17.83% increased 0.86 J sc 27.32 mA cm-2, while displayed elevated 0.87 improved 74.71%, leading 17.44%. was achieved using non-halogenated greener solvent o-xylene, highlighting their potential for facilitating eco-friendly processing procedures. C-shaped disubstituted o-BDP-based A-D-A type acceptors open up avenues tailoring electronic properties molecular self-assembly, achieving OPV performance enhanced suppression reduced loss.

Язык: Английский

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Quasi-Planar Heterojunction: Enhancing Stability and Practicality in Organic Photovoltaics

ACS Energy Letters, Год журнала: 2025, Номер unknown, С. 935 - 946

Опубликована: Янв. 24, 2025

Язык: Английский

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Chlorine‐Mediated Dispersion Modulates Packing Arrangement of Asymmetric Acceptors for High‐Performance Organic Solar Cells

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Abstract This study focuses on the synthesis and performance of non‐fullerene acceptors (NFAs) with varying chlorine dispersion in organic solar cells (OSCs). Four chlorine‐mediated acceptors, BO3Cl‐ a , γ β BOEH3Cl‐ are synthesized isomeric terminal groups then integrated donor PBDB‐TF to fabricate OSCs. It finds that increased improves device efficiency enhanced current ‐based devices achieving power conversion (PCE) over 19%, which is one highest values reported for asymmetrically chlorinated acceptors. In OSC devices, Enhanced exciton dissociation reduced carrier recombination observed more dispersion, along improved charge transport due modulation molecular packing active layer. Furthermore, transient absorption spectroscopy elucidates augments diffusion time, thereby elevating density while branching strategy further amplify lifetime preserving value short face spectral blue shifts it. The findings suggest key factor enhancing by progressive arrangement aggregation behaviors.

Язык: Английский

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