19% efficiency in organic solar cells of Benzo[1,2-b:4,5-b′]Difuran-based donor polymer realized by volatile + non-volatile dual-solid-additive strategy

Materials Science and Engineering R Reports, Journal Year: 2024, Volume and Issue: 159, P. 100794 - 100794

Published: April 13, 2024

Language: Английский

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Asymmetric Π‐Bridge Engineering Enables High‐Permittivity Benzo[1,2‐B:4,5‐b′]Difuran‐Conjugated Polymer for Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(9)

Published: Sept. 13, 2023

Abstract Organic solar cells (OSCs) exhibit complex charge dynamics, which are closely correlated with the dielectric constant (ɛ r ) of photovoltaic materials. In this work, a series novel conjugated copolymers based on benzo[1,2‐b:4,5‐b′]difuran (BDF) and benzotriazole (BTz) is designed synthesized, differ by nature π‐bridge from one another. The PBDF‐TF‐BTz asymmetric furan thiophene demonstrates larger ɛ 4.22 than PBDF‐dT‐BTz symmetric (3.15) PBDF‐dF‐BTz (3.90). also offers more favorable molecular packing appropriate miscibility non‐fullerene acceptor Y6 its counterparts. corresponding PBDF‐TF‐BTz:Y6 OSCs display efficient exciton dissociation, fast transport collection, reduced recombination, eventually leading to power conversion efficiency 17.01%. When introducing fullerene derivative (PCBO‐12) as third component, PBDF‐TF‐BTz:Y6:PCBO‐12 yield remarkable FF 80.11% high 18.10%, highest value among all reported BDF‐polymer‐based OSCs. This work provides an effective approach developing high‐permittivity materials, showcasing promising polymer donor for constructing high‐performance

Language: Английский

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Effect of 1‐Fluoro‐2‐iodobenzene Solvent Additive on the Crystallization of Donors and Acceptors, and Ultrafast Carrier Dynamics in Polymer Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(13)

Published: Dec. 15, 2023

Abstract Controlled sequential crystallization of donors and acceptors is a critical factor for achieving enhanced phase separation efficient charge transfer performance in polymer solar cells (PSCs). In this study, comprehensive investigation structurally simple solvent additive, 1‐fluoro‐2‐iodobenzene (OFIB) conducted, which efficiently controls the morphology active layer, resulting fibrous assembly significantly enhancing power conversion efficiency from 16.34% to 18.38% based on PM6:L8‐BO system. Density functional theory, molecular dynamics simulations, grazing incidence small‐ wide‐angle X‐ray scattering techniques reveal that addition OFIB processed blend aligns orientation acceptor molecules, thereby overall π–π stacking layer. establishes nearly equal‐strength interactions with conjugated frameworks both donor materials, benefiting multiple electron conjugation between its iodine atom framework Femtosecond‐timescale photophysical studies demonstrate OFIB‐optimized layer shows reduced exciton losses at donor–acceptor interface. This study offers new perspective mechanism underlying function additives presents research methodology will guide development next‐generation non‐fullerene PSCs.

Language: Английский

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Exploiting the donor‐acceptor‐additive interaction's morphological effect on the performance of organic solar cells

Aggregate, Journal Year: 2023, Volume and Issue: 5(2)

Published: Nov. 6, 2023

Abstract Organic solar cells (OSCs) have demonstrated over 19% power conversion efficiency (PCE) with the help of material innovation and device optimization. Co‐working newly designed materials, traditional solvent additives, 1‐chloronaphthalene (CN), 1,8‐diodooctane (DIO) are still powerful in morphology modulation towards satisfying efficiencies. Here, we chose recently reported high‐performance polymer donors (PM6 & D18‐Fu) small molecular acceptors (Y6 L8‐BO) as active layer materials processed them by different conditions (CN or DIO none). Based on corresponding 12 groups results, their film characterizations (both ex‐situ in‐situ ones), property‐performance relationships revealed case case. It is thereby supposed to be taken a successful attempt demonstrate importance complexity donor‐acceptor‐additive interaction, since performance physics analyses also tightly combined variation. Furthermore, ternary blend construction for PCE improvement provides an approaching level showcases potential understanding‐guided‐optimization (UGO) future OSCs.

Language: Английский

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Removable Additive Assists Blade‐Coated Large‐Area Organic Solar Cell Modules Fabricated with Non‐Halogenated Solvents Achieving Efficiency Over 16%

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

Published: March 24, 2024

Abstract The critical step in commercializing organic solar cells (OSCs) involves achieving high‐performance modules through environmentally friendly solvents. incorporation of solid additives, recognized as an effective method for modulating the morphology active layers layer‐by‐layer (LBL) deposition, plays a significant role. Here, novel volatile additive is introduced individually into non‐halogenated solution donor PM6 morphology‐modulating agent. induces conformational and crystalline orientation change PM6, resulting enhanced balanced charge transport layer. With focus on exciton dynamics, optimized layer inhibits formation low‐energy triplet states. It facilitates strong reverse hole transfer processes, leading to more efficient dissociation. final small‐area LBL blade‐coated OSCs fabricated under ambient conditions achieve power conversion efficiency (PCE) 18.42%. Furthermore, large‐area module with area 28.82 cm 2 manufactured, PCE 16.04% high geometric fill factor 93.8%. This highlights modulation use additives provides successful strategy fabricating OSC

Language: Английский

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Asymmetrified Benzothiadiazole‐Based Solid Additives Enable All‐Polymer Solar Cells with Efficiency Over 19 %

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 64(1)

Published: Aug. 24, 2024

Disordered polymer chain entanglements within all-polymer blends limit the formation of optimal donor-acceptor phase separation. Therefore, developing effective methods to regulate morphology evolution is crucial for achieving morphological features in organic solar cells (APSCs). In this study, two isomers, 4,5-difluorobenzo-c-1,2,5-thiadiazole (SF-1) and 5,6-difluorobenzo-c-1,2,5-thiadiazole (SF-2), were designed as solid additives based on widely-used electron-deficient benzothiadiazole unit nonfullerene acceptors. The incorporation SF-1 or SF-2 into PM6 : PY-DT blend induces stronger molecular packing via interaction, leading continuous interpenetrated networks with suitable phase-separation vertical distribution. Furthermore, after treatment SF-2, exciton diffusion lengths films are extended over 40 nm, favoring charge transport. asymmetrical characterized by an enhanced dipole moment, increases power conversion efficiency (PCE) PY-DT-based device 18.83 % due electrostatic interactions. Moreover, a ternary strategy boosts PCE SF-2-treated APSC 19 %. This work not only demonstrates one best performances APSCs but also offers approach manipulate using rational-designed additives.

Language: Английский

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Crossbreeding Effect of Chalcogenation and Iodination on Benzene Additives Enables Optimized Morphology and 19.68% Efficiency of Organic Solar Cells

Advanced Science, Journal Year: 2024, Volume and Issue: 11(23)

Published: March 25, 2024

Abstract Volatile solid additives have attracted increasing attention in optimizing the morphology and improving performance of currently dominated non‐fullerene acceptor‐based organic solar cells (OSCs). However, underlying principles governing rational design volatile remain elusive. Herein, a series efficient are successfully developed by crossbreeding effect chalcogenation iodination for photovoltaic performances OSCs. Five benzene derivatives 1,4‐dimethoxybenzene (DOB), 1‐iodo‐4‐methoxybenzene (OIB), 1‐iodo‐4‐methylthiobenzene (SIB), 1,4‐dimethylthiobenzene (DSB) 1,4‐diiodobenzene (DIB) systematically studied, where widely used DIB is as reference. The on overall property comprehensively investigated, which indicates that versatile functional groups provided various types noncovalent interactions with host materials modulating morphology. Among them, SIB combination sulphuration enabled more appropriate blend, giving rise to highly ordered molecular packing favorable As result, binary OSCs based PM6:L8‐BO PBTz‐F:L8‐BO well ternary PBTz‐F:PM6:L8‐BO achieved impressive high PCEs 18.87%, 18.81% 19.68%, respectively, among highest values

Language: Английский

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Tackling Energy Loss in Organic Solar Cells via Volatile Solid Additive Strategy

Advanced Science, Journal Year: 2024, Volume and Issue: 11(25)

Published: April 18, 2024

Abstract The energy loss induced open‐circuit voltage ( V OC ) deficit hampers the rapid development of state‐of‐the‐art organic solar cells (OSCs), therefore, it is extremely urgent to explore effective strategies address this issue. Herein, a new volatile solid additive 1,4‐bis(iodomethyl)cyclohexane (DIMCH) featured with concentrated electrostatic potential distribution utilized act as morphology‐directing guest reduce in multiple state‐of‐art blend system, leading one highest efficiency (18.8%) at forefront reported binary OSCs. Volatile DIMCH decreases radiative/non‐radiative recombination (Δ E 2 /Δ 3 by rationally balancing crystallinity donors and acceptors realizing homogeneous network structure crystal domain reduced D–A phase separation during film formation process weakens disorder trap density It believed that study brings not only profound understanding emerging additives but also hope further improve performance

Language: Английский

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

EnergyChem, Journal Year: 2024, Volume and Issue: 6(4), P. 100129 - 100129

Published: June 15, 2024

Language: Английский

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Halogenation Engineering of Solid Additives Enables 19.39% Efficiency and Stable Binary Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Both Donor and Acceptor Components

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

Published: Oct. 3, 2024

Abstract By selectively interacting with acceptor components, various typed solid additives achieve boosted power conversion efficiency (PCE) in organic solar cells (OSCs). However, due to the efficient active layer being composed of donor and materials, it is difficult obtain desired morphology by manipulating component alone, limiting further improvement PCEs. Herein, two a same backbone thiophene‐benzene‐thiophene (halogen‐free D1‐H) but different halogen substituents (fluorinated D1‐F chlorinated D1‐Cl) are developed probe working mechanism halogenated variation OSCs. Unlike D1‐H continuous charge distributions, D1‐Cl show isolated positive distribution benzene‐core negative thiophene, offering stronger non‐covalent interactions both (PM6) (L8‐BO), especially D1‐Cl. Consequently, D1‐Cl‐treated obtains an optimized phase separation improved molecular packing, boosting PCE 18.59% device stability OSCs, 17.62% for D1‐H‐treated counterparts. Moreover, using D18:L8‐BO D18:BTP‐eC9 as layers, binary OSCs impressive PCEs 19.29% 19.39%, respectively. This work indicates that halogenation engineering can effectively regulate improving elucidates underlying mechanism.

Language: Английский

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