Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162655 - 162655
Published: April 1, 2025
Language: Английский
Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 16(1)
Published: Nov. 23, 2023
Abstract With plenty of popular and effective ternary organic solar cells (OSCs) construction strategies proposed applied, its power conversion efficiencies (PCEs) have come to a new level over 19% in single-junction devices. However, previous studies are heavily based chloroform (CF) leaving behind substantial knowledge deficiencies understanding the influence solvent choice when introducing third component. Herein, we present case where newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy, named BTP-BO-3FO with enlarged bandgap, brings different morphological evolution performance improvement effect on host system PM6:BTP-eC9, processed by CF ortho-xylene ( o -XY). detailed analyses supported series experiments, best PCE 19.24% for green solvent-processed OSCs is found be fruit finely tuned crystalline ordering general aggregation motif, which furthermore nourishes favorable charge generation recombination behavior. Likewise, can achieved replacing spin-coating blade coating active layer deposition. This work focuses commonly met yet frequently ignored issues building blends demonstrate cutting-edge device performance, hence, will instructive other OSC works future.
Language: Английский
Citations
56
Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)
Published: Nov. 23, 2023
Abstract Giant dimeric acceptor (G‐Dimer) is becoming one of the most promising organic solar cell (OSC) materials because its definite structure, long‐term stability, and high efficiency. Strengthening hetero‐molecular interactions by monomer modification greatly influences morphology thus device performance, but lacks investigation. Herein, two novel quinoxaline core‐based G‐Dimers, Dimer‐QX Dimer‐2CF, are synthesized. By comparing trifluoromethyl‐substituted Dimer‐2CF non‐substituted Dimer‐QX, trifluoromethylation effect on G‐Dimer investigated revealed. The trifluoromethyl with strong electronegativity increases electrostatic potential reduces surface energy G‐Dimer, weakening homo‐molecular ordered packing reinforcing interaction donor. suppresses fast assembly during film formation, facilitating small domains molecular in blend, which a trade‐off conventional control. Together favorable vertical phase separation, efficient charge generation, reduced bimolecular recombination concurrently obtained. Hence, Dimer‐2CF‐based OSCs obtain cutting‐edge efficiency 19.02% fill factor surpassing 80%, an averaged extrapolated T 80 ≈12 000 h under continuous °C heating. This study emphasizes importance strategy, providing facile strategy for designing highly stable OSC materials.
Language: Английский
Citations
44
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(33)
Published: June 19, 2024
In the recent advances of organic solar cells (OSCs), quinoxaline (Qx)-based nonfullerene acceptors (QxNFAs) have attracted lots attention and enabled recorded power conversion efficiency approaching 20%. As an excellent electron-withdrawing unit, Qx possesses advantages many modifiable sites, wide absorption range, low reorganization energy, so on. To develop promising QxNFAs to further enhance photovoltaic performance OSCs, it is necessary systematically summarize reported far. this review, all focused are classified into five categories as following: SM-Qx, YQx, fused-YQx, giant-YQx, polymer-Qx according molecular skeletons. The design concepts, relationships between structure optoelectronic properties, intrinsic mechanisms device discussed in detail. At end, kind materials summed up, direction prospected, challenges faced by given, constructive solutions existing problems advised. Overall, review presents unique viewpoints conquer challenge thus boost OSCs development toward commercial applications.
Language: Английский
Citations
28
Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(30)
Published: May 11, 2024
Abstract Cyanation is a common chemical modification strategy to fine‐tune the energy levels and molecular packing of organic semiconductors, especially materials used in solar cells (OSCs). Generally, cyanation modify end groups high‐performance small‐molecule acceptors (SMAs). However, has not been investigated on central backbone SMAs, which could introduce stronger intermolecular interaction enhance π–π stacking for rapid charge transport. This paper, first time, reports new benzo‐quinoxaline core synthesizes two novel A‐DA'D‐A type named BQx‐CN BQx‐2CN, with mono‐ di‐cyanide groups, respectively. Through tailoring number CN BQx‐CN‐based OSC exhibits best device performance 18.8%, significantly higher than non‐cyano BQx‐based one. The reason superior devices can be attributed fine‐tuned level, packing, ideal phase segregation, lead exciton dissociation, faster transport, suppressed recombination, therefore highest fill factor (FF) power conversion efficiencies (PCE). research demonstrates effectiveness SMAs enhanced better OSCs.
Language: Английский
Citations
22
ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 9, 2025
The rapid development of organic solar cells (OSCs) has been particularly remarkable following the introduction high-performance small molecule electron acceptor Y6 and its derivatives. Despite advances in state-of-the-art OSCs, challenges remain, notably relatively low open circuit voltage (VOC) charge mobility imbalance, which continue to hinder further improvements OSCs' performance. To address these issues, this work, we synthesized a main-chain twisted wide bandgap i-IEDTB, not only possesses superior hole over but also higher lowest unoccupied molecular orbital (LUMO) energy levels, adopted it as bifunctional third compound couple with terpolymer Z10 based OSC system. integration i-IEDTB Z10:Y6 blend, either an or donor, significantly reduces excessive aggregation facilitates harmonized distribution mobilities by modulating crystallization properties materials. This strategic intervention leads marked improvement VOC fill factor (FF). Consequently, power conversion efficiency (PCE) optimized Z10:(Y6:i-IEDTB) ternary device is elevated impressive 17.70%, surpassing 16.50% binary OSC. Besides, after doping 5% weight replaced that Z10, device's VOC, FF were increased 0.846 V 78.08% respectively, resulting enhanced PCE 17.47%. Further investigation demonstrates universality PM6:BTP-eC9-based PM6:L8-BO-based achieving champion efficiencies 18.14 18.08%, respectively. work highlights key role complementary component crystallographic order carrier balance within Y-type acceptor-based OSCs.
Language: Английский
Citations
3
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
Citations
35
Advanced Materials, Journal Year: 2023, Volume and Issue: 36(11)
Published: Dec. 15, 2023
Abstract The success of Y6‐type nonfullerene small molecule acceptors (NF‐SMAs) in polymer solar cells (PSCs) can be attributed to their unique honeycomb stacking style, which leads favorable thin‐film morphologies. intermolecular interactions related the crystallization tendency these NF‐SMAs is closely governed by electron accepting end groups. For example, high performance Y6 derivative L8‐BO (BTP‐4F) presents three types modes contrast two Y6. Hence, it ultimately interesting obtain more insight on packing properties and preferences influenced chemical modifications such as group engineering. This work designs synthesizes asymmetric symmetric derivatives with brominated groups explores various modes. BTP‐3FBr displays an optimized thin film morphology, leading a decent power conversion efficiency (PCE) 18.34% binary devices top PCE 19.32% ternary containing 15 wt% IDIC second acceptor.
Language: Английский
Citations
30
Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(18), P. 6844 - 6855
Published: Jan. 1, 2024
We systematically investigated the effects of top substituents on physicochemical properties SMAs and achieved highest PCE for OSCs processed using a non-halogenated solvent without any extra treatment.
Language: Английский
Citations
16
Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(14), P. 4944 - 4967
Published: Jan. 1, 2024
Quinoxaline-based nonfullerene acceptors show highly tunable photoelectric properties and superior performance for sunlight utilization enabled by their powerful core-functionalization ability.
Language: Английский
Citations
15
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(10)
Published: Jan. 8, 2024
Abstract End‐groups halogenation strategies, generally refers to fluorination and chlorination, have been confirmed as simple efficient methods regulate the photoelectric performance of non‐fullerene acceptors (NFAs), but a controversy over which one is better has existed for long time. Here, two novel NFAs, C9N3‐4F C9N3‐4Cl, featured with different end‐groups were successfully synthesized blended renowned donors, D18 PM6, electron‐withdrawing units. Detailed theoretical calculations morphology characterizations interface structures indicate NFAs based on possess binding energy miscibility shows an obvious influence phase‐separation morphology, charge transport behavior device performance. After verified by other three pairs reported universal conclusion obtained devices fluorination‐end‐groups‐based PM6 chlorination‐end‐groups‐based show excellent efficiencies, high fill factors stability. Finally, D18: PM6: C9N3‐4Cl yield outstanding efficiency 18.53 % 18.00 %, respectively. Suitably selecting donor regulating donor/acceptor can accurately present conversion ability points out way further molecular design selection high‐performance stable organic solar cells.
Language: Английский
Citations
14