Hybrid Cycloalkyl‐Alkyl Chain‐Based Symmetric/Asymmetric Acceptors with Optimized Crystal Packing and Interfacial Exciton Properties for Efficient Organic Solar Cells

Advanced Science, Год журнала: 2023, Номер 10(7)

Опубликована: Янв. 2, 2023

Abstract Hybrid cycloalkyl‐alkyl side chains are considered a unique composite side‐chain system for the construction of novel organic semiconductor materials. However, there is lack fundamental understanding variations in single‐crystal structures as well optoelectronic and energetic properties generated by introduction hybrid electron acceptors. Herein, symmetric/asymmetric acceptors (Y‐C10ch A‐C10ch) bearing bilateral unilateral 10‐cyclohexyldecyl designed, synthesized, compared with symmetric acceptor 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐butyloctyl)‐3,9 bis(ethylhexyl)‐12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5] pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐ diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (L8‐BO). The stepwise decreases optical bandgap, deepens energy level, enables molecules to pack closely regular manner. Crystallographic analysis demonstrates that chain endows more planar skeleton enforces compact 3D network packing, resulting an active layer higher domain purity. Moreover, affects donor/acceptor interfacial energetics accelerates exciton dissociation, enabling power conversion efficiency (PCE) >18% 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐ethylhexyl)‐3,9‐diundecyl12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (Y6) (PM6):A‐C10ch‐based solar cells (OSCs). Importantly, incorporation Y‐C10ch third component PM6:L8‐BO blend results PCE 19.1%. superior molecular packing behavior highlighted here fabrication high‐performance OSCs.

Язык: Английский

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Non‐Halogen Solvent Processed Binary Organic Solar Cells with Efficiency of 19% and Module Efficiency Over 15% Enabled by Asymmetric Alkyl Chain Engineering

Advanced Energy Materials, Год журнала: 2023, Номер 13(39)

Опубликована: Сен. 3, 2023

Abstract The effective molecular design of non‐fullerene acceptors is important to high‐efficiency organic solar cells. Herein, asymmetric alkyl chain engineering applied a new acceptor named DTC11. Compared with the model accpetor DTY6 two long‐branched chains (2‐decyltetradecyl) on dithie‐nothiophen[3.2‐b]‐pyrrolobenzothiadiazole central unit, DTC11 owns 2‐decyltetradecyl and an undecyl in inner bay side unit. It found that such modification long chains, crystallinity, absorption coefficient, exciton lifetime are all improved. Moreover, comparison D18:DTY6 device, non‐halogen solvent processed D18:DTC11 device shows enhanced generation dissociation, improved charge transport as well weak recombination, promoting higher short‐circuit current density fill factor. Consequently, delivers outstanding efficiency 19.0%. More significantly, large‐area module (active area 21 cm 2 ) fabricated by blade coating, impressive 15.4% factor 74.6% realized. This study demonstrates feasible strategy high‐performance processability, which very essential for commercialization module.

Язык: Английский

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Green-Solvent Processed Blade-Coating Organic Solar Cells with an Efficiency Approaching 19% Enabled by Alkyl-Tailored Acceptors

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Ноя. 2, 2023

Abstract Power-conversion-efficiencies (PCEs) of organic solar cells (OSCs) in laboratory, normally processed by spin-coating technology with toxic halogenated solvents, have reached over 19%. However, there is usually a marked PCE drop when the blade-coating and/or green-solvents toward large-scale printing are used instead, which hampers practical development OSCs. Here, new series N -alkyl-tailored small molecule acceptors named YR-SeNF same molecular main backbone developed combining selenium-fused central-core and naphthalene-fused end-group. Thanks to -alkyl engineering, NIR-absorbing show different crystallinity, packing patterns, miscibility polymeric donor. The studies exhibit that packing, vertical distribution active layer morphologies well optimized introducing newly designed guest acceptor associated tailored chains, providing improved charge transfer dynamics stability for PM6:L8-BO:YR-SeNF-based As result, record-high approaching 19% achieved OSCs fabricated from green-solvent o -xylene high-boiling point. Notably, ternary offer robust operating under maximum-power-point tracking well-keep > 80% initial PCEs even 400 h. Our alkyl-tailored strategy provides unique approach develop high-efficiency stable OSCs, paves way industrial development.

Язык: Английский

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Diffusion‐Limited Accepter Alloy Enables Highly Efficient and Stable Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 33(18)

Опубликована: Фев. 20, 2023

Abstract Organic solar cells (OSCs) are designed based on a blend of polymer donor and small molecular acceptor whereby the thermodynamic relaxation morphology raises concerns related to operational stability. Herein, it is demonstrated that classical Y6‐based binary device can be stabilized by using its derivative ZCCF3 as third component, which with replacing thiadiazole group Y6 trifluoromethyl substituted diazepine unit. delivers not only higher glass transition temperature ( T g ) than but also have hyper‐miscibility Y6, contributing favorable diffusion‐limited Y6:ZCCF3 alloy when blended donor. Consequently, champion power conversion efficiency 18.54% achieved in optimal PM6: Y6: devices, retain their 80% initial up 360 h. This study highlights importance high component derived hyper‐miscible accepter alloys achieving highly efficient stable OSCs.

Язык: Английский

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Binary Organic Solar Cells with over 19 % Efficiency and Enhanced Morphology Stability Enabled by Asymmetric Acceptors

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(12)

Опубликована: Янв. 30, 2024

Abstract The simultaneous improvement of efficiency and stability organic solar cells (OSCs) for commercialization remains a challenging task. Herein, we designed asymmetric acceptors DT‐C8Cl DT‐C8BTz with functional haloalkyl chains, in which the halogen atoms could induce noncovalent interactions heteroatoms like O, S, Se, etc ., thus leading to appropriately manipulated film morphology. Consequently, binary devices based on D18: achieved champion power conversion (PCE) 19.40 %. higher PCE be attributed enhanced π–π stacking, improved charge transport, reduced recombination losses. In addition, induced by chains effectively suppress unfavorable morphology evolutions thereby reduce trap density states, thermal storage stability. Overall, our findings reveal that rational design is novel powerful strategy simultaneously enhancing OSCs.

Язык: Английский

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