Optimizing Branching Linkers in Dimerized Acceptors for Enhanced Efficiency and Stability in Organic Solar Cells DOI Open Access
Yunpeng Wang, Yiwu Zhu, Hanjian Lai

и другие.

Small, Год журнала: 2025, Номер unknown

Опубликована: Март 10, 2025

Most high-performing dimerized acceptors are based on Y-series precursors with superior conjugated π-backbones. The utilization of branch-connected can fully leverage the four end groups to enhance molecular packing, thereby potentially improving both stability organic solar cells (OSCs) while maintaining high power conversion efficiency (PCE). Therefore, optimizing linker is critical realizing their potential in device performance. In this study, three synthesized and conjugation-break linkers branching direction systematically investigate effects different structures properties By introducing an appropriate flexible chain, favorable solubility, morphology achieved, which facilitates charge generation transport suppressing recombination. As a result, OSC dYTAT-C6-F exhibits significantly improved PCE 18.08%, highest among direction. Additionally, demonstrates T80 lifetime 1840 h. These results indicate that conjugation breakages tune aggregation, carrier mobility length further improves these characteristics. findings highlight significant engineering achieve outstanding

Язык: Английский

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 DOI
Zhenghui Luo,

Weifei Wei,

Ruijie Ma

и другие.

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

Процитировано

29

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

Jiali Song,

Hanjian Lai

и другие.

Nature Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Язык: Английский

Процитировано

11

Precise Methylation Yields Acceptor with Hydrogen‐Bonding Network for High‐Efficiency and Thermally Stable Polymer Solar Cells DOI

Weifei Wei,

Cai’e Zhang, Zhanxiang Chen

и другие.

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

Процитировано

36

Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization DOI
Kerui Liu, Yuanyuan Jiang,

Feng Liu

и другие.

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

Процитировано

16

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

Yuanqing Bai,

Ling Hong,

Yuejia Dou

и другие.

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

Процитировано

15

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

Waqar Ali Memon,

Zihao Deng, Feng He

и другие.

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

Опубликована: Июнь 15, 2024

Язык: Английский

Процитировано

13

A Difluoro‐Methoxylated Ending‐Group Asymmetric Small Molecule Acceptor Lead Efficient Binary Organic Photovoltaic Blend DOI Creative Commons
Weiwei Wu, Bosen Zou, Ruijie Ma

и другие.

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

Процитировано

10

Fluorinated and Methylated ortho-Benzodipyrrole-Based Acceptors Suppressing Charge Recombination and Minimizing Energy Loss in Organic Photovoltaics DOI Creative Commons
Yanbo Wang,

Chia‐Lin Tsai,

Yung‐Jing Xue

и другие.

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

Процитировано

2

Quasi-Planar Heterojunction: Enhancing Stability and Practicality in Organic Photovoltaics DOI
Yiwu Zhu, Feng He

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

Опубликована: Янв. 24, 2025

Язык: Английский

Процитировано

2

Chlorine‐Mediated Dispersion Modulates Packing Arrangement of Asymmetric Acceptors for High‐Performance Organic Solar Cells DOI Open Access
Hanjian Lai, Yongwen Lang, Yongmin Luo

и другие.

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

Процитировано

2