Tuning of the Polymeric Nanofibril Geometry via Side-Chain Interaction toward 20.1% Efficiency of Organic Solar Cells

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 2, 2024

Constructing fibril morphology has been believed to be an effective method of achieving efficient exciton dissociation and charge transport in organic solar cells (OSCs). Despite emerging endeavors on the fibrillization semiconductors via chemical structural design or physical manipulation, tuning geometry, i.e., width length, for tailored optoelectronic properties remains studied depth. In this work, a series alkoxythiophene additives featuring varied alkyl side chains connected thiophene are designed modulate growth aggregates cutting-edge polymer donors PM6 D18. Molecular dynamics simulations morphological characterizations reveal that these preferentially locate near entangle with donors, which enhance conjugated backbone stacking form nanofibrils expanding from 12.6 21.8 nm length increasing 98.3 232.7 nm. This nanofibril structure is feasible acquire simultaneously. By integrating L8-BO as donor acceptor layers pseudo-bulk heterojunction (p-BHJ) OSCs layer-by-layer deposition, improvement power conversion efficiency (PCE) 18.7% 19.8% observed, contributed by enhanced light absorption, transport, reduced recombination. The versatility also verified D18:L8-BO OSCs, PCE 19.3% 20.1%, among highest values reported OSCs.

Language: Английский

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The Phase Separation Control in All‐Polymer Solar Cells

SusMat, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

ABSTRACT All‐polymer solar cells (all‐PSCs) are of interest owing to their unique advantages, including remarkably improved device stability and exceptional mechanical stretchability. Over recent years, there has been a notable increase in the power conversion efficiency (PCE) all‐PSCs, largely attributed advancements morphology control active layer. Notably, domain size is paramount importance as it impacts critical factors such exciton dissociation, charge transport, collection. However, low glass transition temperature conjugated polymers, coupled with minimal change mixing entropy, often results an excessive degree phase separation. Consequently, essential comprehend evolution separation develop strategies regulate size. In this review, we elucidate key parameters that contribute enhancement present qualitative quantitative characterization techniques for Building on foundation, introduce principles regulating sizes, encompassing crystallinity, miscibility, molecular conformation from thermodynamic perspective, well film‐forming kinetics crystallization sequence kinetic perspective. Lastly, offer insights into current challenges potential future prospects all‐PSCs.

Language: Английский

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In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells

National Science Review, Journal Year: 2024, Volume and Issue: 11(12)

Published: Nov. 4, 2024

ABSTRACT Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells (all-PSCs), a promising photovoltaic technology towards multi-scenario application. Although the nano-fibrillar network of active layer induced by treatment is confirmed as key factor power conversion efficiency (PCE) all-PSCs, its formation mechanism not clearly revealed, lack precise and convincing real-time observation crystallization phase separation during liquid-to-solid transition process spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering (GIWAXS/GISAXS) screening that reveals fact naphthalene derived solid additives can suppress aggregation polymer acceptor (PY-IT) at beginning stage spin coating, which provides sufficient time space donor (PM6) to form fibril structure. Moreover, guided this knowledge, ternary system proposed, achieves cutting-edge level PCEs both small-area (0.04 cm2) (also decent operational stability) large-area (1 devices.

Language: Английский

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A systematic investigation on pyridine derived solid additives inducing fibrillar morphology for highly efficient organic solar cells with over 20 % efficiency

Materials Science and Engineering R Reports, Journal Year: 2025, Volume and Issue: 164, P. 100977 - 100977

Published: March 18, 2025

Language: Английский

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Chlorinated Bithiophene Imide‐Based n‐Type Polymers: Synthesis, Structure–Property Correlations, and Applications in Organic Electronic Devices

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Abstract Developing electron‐deficient (hetero)arenes with optimized geometries and electronic properties is imperative for advancing n ‐type polymers organic devices. We report here the design synthesis of two chlorinated imide‐functionalized heteroarenes, namely chlorine‐substituted bithiophene imide (ClBTI) its fused dimer (ClBTI2). The corresponding show a near‐planar framework, appropriate frontier molecular orbital levels, good solubility. When integrated into thin‐film transistors, ClBTI2‐based n‐type polymer afforded unipolar electron mobility up to 0.48 cm 2 V −1 s . binary all‐PSCs based on PM6 new power conversion efficiency (PCE) exceeding 1%. Interestingly, by introducing these ordered structure, high crystallinity, sizable as third component host system PM6:PY‐IT, continuous interpenetrating networks large fibrillar structures can be formed. Investigations charge transfer kinetics energy loss analyses unveiled that P(ClBTI2‐BTI) enables transport, reduced recombination, minimized non‐radiative within all‐polymer ternary blends, yielding remarkable PCE 19.35% (certified: 19.20%) through optimizing state‐of‐the‐art PM6:PY‐IT blend. structure–property–performance relationships provide valuable insights polymers, marking great progress in development high‐performance

Language: Английский

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Breaking 20% Efficiency of all‐Polymer Solar Cells via Benzo[1,2‐d:4,5‐d′]Bisthiazole‐Based Terpolymer Donor Strategy for Fine Morphology Optimization

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 15, 2025

Abstract Developing high‐performance all‐polymer solar cells (all‐PSCs) remains a challenge due to the difficulty in controlling morphology of polymer blends. In this study, benzo[1,2‐d:4,5‐d′]bisthiazole (BBTz) is incorporated into PM6 main chain create series terpolymer donors, leveraging entropy increase and superior miscibility with acceptors modulate blend morphology. The introduction BBTz broadened absorption range, enhanced film crystallinity, significantly improved donor‐acceptor through its low dipole moment high electrostatic potential. This facilitated formation nanofiber structures active layer, thus optimizing As result, PBZ‐10:PY‐IT‐based device achieved an impressive power conversion efficiency (PCE) 19.06%. Incorporation PBQx‐TF binary can further improve morphology, charge transport, exciton lifetime, dissociation, collection, as well suppressed recombination, finally leading record‐breaking PCE 20.04% for all‐PSCs date. findings demonstrate effectiveness strategy enhancing all‐PSC performance. By molecular design component selection, approach provides viable pathway achieving higher supports advancement renewable energy technologies.

Language: Английский

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A Fluorinated Imide‐Functionalized Arene Enabling a Wide Bandgap Polymer Donor for Record‐Efficiency All‐Polymer Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 15, 2024

Abstract All‐polymer solar cells (all‐PSCs) present compelling advantages for commercial applications, including mechanical durability and optical thermal stability. However, progress in developing high‐performance polymer donors has trailed behind the emergence of excellent acceptors. In this study, we report a new electron‐deficient arene, fluorinated bithiophene imide (F‐BTI) its donor SA1, which two fluorine atoms are introduced at outer β ‐positions thiophene rings BTI to fine‐tune energy levels aggregation resulting polymers. SA1 exhibits deep HOMO level −5.51 eV, wide bandgap 1.81 eV suitable miscibility with acceptor. Polymer chains incorporating F‐BTI result highly ordered π–π stacking favorable phase‐separated morphology within all‐polymer active layer. Thus, : PY‐IT‐based all‐PSCs exhibit an efficiency 16.31 % stability, is further enhanced record value 19.33 (certified: 19.17 %) by constructing ternary device. This work demonstrates that offers effective route materials improved optoelectronic properties, will change scenario terms stable all‐PSCs.

Language: Английский

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The Critical Isomerization Effect of Core Bromination on Nonfullerene Acceptors in Achieving High‐Performance Organic Solar Cells with Low Energy Loss

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

Published: Dec. 30, 2024

Highly efficient nonfullerene acceptors (NFAs) for organic solar cells (OSCs) with low energy loss (E

Language: Английский

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Precise Control Over Crystallization Kinetics by Combining Nucleating Agents and Plasticizers for 20.1% Efficiency Organic Solar Cells

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Abstract Obtaining controllable active layer morphology plays a significant role in boosting the device performance of organic solar cells (OSCs). Herein, quaternary strategy, which incorporates polymer donor D18‐Cl and small molecule acceptor AITC into host D18:N3, is employed to precisely modulate crystallization kinetics for favorable evolution within layer. In situ spectroscopic measurements during film‐formation demonstrate that while works as nucleator promote aggregation D18 foster donor/acceptor intermixing, has exactly opposite impact on N3 intermixing acceptor, working plasticizer. The mutually compensational effect dual‐guests, result, enables synergistic control over fibrillar networks, multi‐length scale morphology, vertical phase distribution, leading optimized 3D greatly enhanced exciton dissociation charge transfer, suppressed recombination, reduced energy loss. Consequently, OSCs based D18:D18‐Cl:N3:AITC achieved an excellent power conversion efficiency 20.1%, represents one highest efficiencies single‐junction OSCs. This work presents effective strategy regulate toward advanced high‐performance

Language: Английский

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Rebuilding Peripheral F, Cl, Br Footprints on Acceptors Enables Binary Organic Photovoltaic Efficiency Exceeding 19.7%

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 8, 2024

Abstract Given homomorphic fluorine (F), chlorine (Cl) and bromine (Br) atoms are featured with gradually enlarged polarizability/atomic radius but decreased electronegativity, the rational screen of halogen species locations on small molecular acceptors (SMAs) is quite essential for acquiring desirable packing to boost efficiency organic solar cells (OSCs). Herein, three isomeric SMAs (CH−F, CH−C CH−B) constructed by delicately rebuilding peripheral F, Cl, Br footprints both central end units. Such a re‐permutation halogens could not only maintain structural symmetry maximum, also acquire extra asymmetric benefits enhanced dipole moment intramolecular charge transfer, etc. Moreover, brominating enhances crystallinity CH−B without introducing undesirable steric hindrance groups, thus rendering better balance between high crystallization domain size control in PM6:CH−B blend. Further benefitting from large dielectric constant, exciton binding energy, optimized great electron transfer integral, affords first class binary OSC 19.78 %, moreover, highest 18.35 % far when increasing active layer thickness ~300 nm. Our successful screening provides valuable insight into further design record‐breaking OSCs.

Language: Английский

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