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

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(6)

Published: Dec. 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.

Language: Английский

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Simple and Efficient Synthesis of Novel Tetramers with Enhanced Glass Transition Temperature for High‐Performance and Stable Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(3)

Published: Dec. 7, 2023

Oligomer acceptors in organic solar cells (OSCs) have garnered substantial attention owing to their impressive power conversion efficiency (PCE) and long-term stability. However, the simple efficient synthesis of oligomer with higher glass transition temperatures (T

Language: Английский

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A–D–A'–D–A type nonfused ring electron acceptors for efficient organic solar cells via synergistic molecular packing and orientation control

Aggregate, Journal Year: 2024, Volume and Issue: 5(2)

Published: Jan. 4, 2024

Abstract Nonfused ring electron acceptors (NFREAs) are promising candidates for future commercialization of organic solar cells (OSCs) due to their simple synthesis. Still, the power conversion efficiencies (PCEs) NFREA‐based OSCs have large room improvement. In this work, by merging end group halogenation and side chain engineering, we developed four A–D–A'–D–A type NFREAs, which refer as EH‐4F, C4‐4F, EH‐4Cl, C4‐4Cl. Single crystal X‐ray diffraction revealed that multiple intermolecular S···F interactions between cyclopentadithiophene 5,6‐difluoro‐3‐(dicyanomethylene)indanone could cause an unfavorable dimer formation, leading ineffective π–π stackings in EH‐4F whereas no such was found EH‐4Cl C4‐4Cl after replacing with 5,6‐dichloro‐3‐(dicyanomethylene)indanone. Moreover, although shorter n ‐butyl resulted a closer molecular packing C4‐4Cl, (2‐ethylhexyl substitution) proper crystallinity exhibited enhanced face‐on orientation thin film, is favorable vertical charge transport further reducing recombination. As result, PCE 13.0% obtained EH‐4Cl‐based OSC fill factor 0.70. This work highlights importance control toward high‐performance NFREAs.

Language: Английский

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How can we improve the stability of organic solar cells from materials design to device engineering?

Aggregate, Journal Year: 2024, Volume and Issue: 5(5)

Published: April 22, 2024

Abstract Among a promising photovoltaic technology for solar energy conversion, organic cells (OSCs) have been paid much attention, of which the power conversion efficiencies (PCEs) rapidly surpassed over 20%, approaching threshold potential applications. However, device stability OSCs including storage stability, photostability and thermal remains to be an enormous challenge when faced with practical The major causes instability are rooted in poor inherent properties light‐harvesting materials, metastable morphology, interfacial reactions highly sensitive external stresses. To get rid these flaws, comprehensive review is provided about recent strategies methods improving from active layers, engineering encapsulation techniques high‐performance OSC devices. In end, prospectives next stage development devices satisfactory long‐term afforded community.

Language: Английский

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Establishing Co‐Continuous Network of Conjugated Polymers and Elastomers for High‐Performance Polymer Solar Cells with Extreme Stretchability

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(26)

Published: May 13, 2024

Abstract High power conversion efficiency (PCE) and mechanical robustness are prerequisites for wearable applications of organic solar cells (OSCs). However, stretchability present active systems (i.e., crack‐onset strain (COS) < 30%) should be improved. While introducing elastomers into is considered a simple method improving stretchability, the inclusion typically results in decrease PCE OSC with limited enhancement due to lack interconnected electrical pathways. In this study, it developed efficient intrinsically stretchable (IS)‐OSCs exceptional robustness, by constructing co‐continuous networks conjugated polymers (D18) (SEBS) within layers. It demonstrated that blend film specific ratio (40:60 w/w) D18:SEBS crucial forming structures, establishing well‐connected channels. Consequently, D18 0.4 :SEBS 0.6 /L8‐BO OSCs achieve 16‐times higher (COS = 126%) than based on D18/L8‐BO 8%), while achieving 4‐times (12.13%) compared SEBS‐rich layers (D18 0.2 0.8 /L8‐BO, 3.15%). Furthermore, ‐based IS‐OSCs preserve 86 90% original PCEs at 50% after 200 stretching/releasing cycles 15% strain, respectively, demonstrating highest among reported IS‐OSCs.

Language: Английский

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Understanding photochemical degradation mechanisms in photoactive layer materials for organic solar cells

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(14), P. 7426 - 7454

Published: Jan. 1, 2024

Over the past decades, field of organic solar cells (OSCs) has witnessed a significant evolution in materials chemistry, which resulted remarkable enhancement device performance, achieving efficiencies over 19%. The photoactive layer OSCs play crucial role light absorption, charge generation, transport and stability. To facilitate scale-up OSCs, it is imperative to address photostability these electron acceptor donor materials, as their photochemical degradation process remains challenge during photo-to-electric conversion. In this review, we present an overview development emphasizing aspects chemical stability behavior that are linked OSCs. Throughout each section, highlight pathways for link degradation. We also discuss existing interdisciplinary challenges obstacles impede photostable materials. Finally, offer insights into strategies aimed at enhancing future directions developing photo-active layers, facilitating commercialization

Language: Английский

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A quinoxaline–benzothiadiazole heterotrimer for organic solar cells with extraordinary efficiency and stability

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(10), P. 3641 - 3650

Published: Jan. 1, 2024

A new hybrid strategy synthesizes the TQT acceptor with thiadiazole and quinoxaline units. The resulting TQT-based OSC achieved 18.52% efficiency, topping linear trimer acceptor-based OSCs, while also exhibiting robust stability.

Language: Английский

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Efficient and Photostable Organic Solar Cells Achieved by Alloyed Dimer Acceptors with Tailored Linker Structures

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 27, 2024

Abstract High power conversion efficiency (PCE) and long‐term stability are prerequisites for commercialization of organic solar cells (OSCs). Herein, two dimer acceptors (DYTVT DYTCVT) developed with different properties through linker engineering, study their effects as alloy‐like on the photovoltaic performance photostability OSCs. These ternary OSCs effectively combine advantages both acceptors. DYTVT, characterized by its high backbone planarity, ensures elevated electron mobility glass‐transition temperature ( T g ), leading to efficient charge transport enhanced Conversely, DYTCVT, significant dipole moment electrostatic potential, enhances compatibility alloy donors refines blend morphology, facilitating generation in Consequently, D18:DYTVT:DYTCVT exhibit higher PCE (18.4%) compared D18:MYT (monomer acceptor, = 16.5%), D18:DYTVT (PCE 17.4%), D18:DYTCVT 17.0%) Furthermore, owing (133 °C) than MYT 80 DYTCVT 120 °C), have significantly t 80% lifetime 4250 h under 1‐sun illumination) 40 h) 2910 h).

Language: Английский

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A case study of comparing two dimerized acceptor molecules built by different branch-connected and terminal-connected approaches

Science China Chemistry, Journal Year: 2024, Volume and Issue: 67(5), P. 1687 - 1696

Published: March 29, 2024

Language: Английский

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Influence of Donor Skeleton on Intramolecular Electron Transfer Amount for Efficient Perovskite Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(32)

Published: May 16, 2024

Abstract The passivation of the defects derived from rapid‐crystallization with electron‐donating molecules is always a prerequisite to obtain desirable perovskite films for efficient and stable solar cells, thus, in‐depth understanding on correlations between molecular structure capacity great importance screening passivators. Here, we introduce double‐ended amide molecule into precursor solution modulate crystallization process passivate defects. By regulating intermediate bridging skeletons alkyl, alkenyl benzene groups, results show strength highly depends spin‐state electronic that serves as an intrinsic descriptor determine intramolecular charge distribution by controlling orbital electron transfer donor segment acceptor segment. Upon careful optimization, benzene‐bridged demonstrates superior efficacy improving film quality. As physical proof‐of‐concept, carbon‐based, all‐inorganic CsPbI 2 Br cell delivers significantly increased efficiency 15.51 % remarkably improved stability. Based same principle, champion 24.20 further obtained inverted (Cs 0.05 MA FA 0.9 )Pb(I 0.93 0.07 ) 3 cell. These findings provide new fundamental insights influence modulation effective cells.

Language: Английский

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