Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology

Nature Materials, Год журнала: 2022, Номер 21(6), С. 656 - 663

Опубликована: Май 5, 2022

Язык: Английский

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Ternary Blend Organic Solar Cells: Understanding the Morphology from Recent Progress

Advanced Materials, Год журнала: 2021, Номер 34(46)

Опубликована: Ноя. 19, 2021

Ternary blend organic solar cells (TB-OSCs) incorporating multiple donor and/or acceptor materials into the active layer have emerged as a promising strategy to simultaneously improve overall device parameters for realizing higher performances than binary devices. Whereas introducing also results in more complicated morphology their counterparts. Understanding is crucially important further improving performance of TB-OSC. This review introduces solubility and miscibility that affect ternary blends. Then, this summarizes recent processes study on blends from aspects molecular crystallinity, packing orientation, domain size purity, directly observation morphology, vertical phase separation well morphological stability. Finally, summary prospects TB-OSCs are concluded.

Язык: Английский

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Achieving Record-Efficiency Organic Solar Cells upon Tuning the Conformation of Solid Additives

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(32), С. 14731 - 14739

Опубликована: Июль 20, 2022

Volatile solid additives (SADs) are considered as a simple yet effective approach to tune the film morphology for high-performance organic solar cells (OSCs). However, structural effects of SADs on photovoltaic performance still elusive. Herein, two volatilizable were designed and synthesized. One is SAD1 with twisted conformation, while other one planar SAD2 S···O noncovalent intramolecular interactions (NIIs). The theoretical experimental results revealed that smaller space occupation can more easily insert between Y6 molecules, which beneficial form tighter intermolecular packing mode after thermal treatment. As result, SAD2-treated OSCs exhibited less recombination loss, balanced charge mobility, higher hole transfer rate, favorable morphology, resulting in record power conversion efficiency (PCE) 18.85% (certified PCE: 18.7%) single-junction binary OSCs. universality this study shed light understanding conformation performances

Язык: Английский

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19.10% Efficiency and 80.5% Fill Factor Layer‐by‐Layer Organic Solar Cells Realized by 4‐Bis(2‐Thienyl)Pyrrole‐2,5‐Dione Based Polymer Additives for Inducing Vertical Segregation Morphology

Advanced Materials, Год журнала: 2022, Номер 35(6)

Опубликована: Ноя. 22, 2022

The morphology plays a key role in determining the charge generation and collection process, thus impacting performances of organic solar cells (OSCs). limited selection pool additives to optimize OSCs, especially for emerging layer-by-layer (LbL) impeding improvements photovoltaic performances. Herein, new method using conjugated polymers as improving LbL-OSCs is reported. Four PH, PS, PF, PCl are developed with different side chains. These exhibit poor donor materials BHJ devices, due unsuitable energy level alignment unfavorable molecular interactions. By contrast, they can be served efficient PM6 fibril matrix facilitating penetration BTP-eC9 forming an intertwined D/A bicontinuous network vertical segregation. Such optimized by chain engineering, which enables progressive improvement separation collection. As result, adding small amount additive, contributes champion PCE 19.10% high FF 80.5%.

Язык: Английский

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Enhancing Photon Utilization Efficiency for High‐Performance Organic Photovoltaic Cells via Regulating Phase‐Transition Kinetics

Advanced Materials, Год журнала: 2023, Номер 35(16)

Опубликована: Янв. 30, 2023

Efficient photon utilization is key to achieving high-performance organic photovoltaic (OPV) cells. In this study, a multiscale fibril network morphology in PBQx-TCl:PBDB-TF:eC9-2Cl-based system constructed by regulating donor and acceptor phase-transition kinetics. The distinctive process crystal size are systematically investigated. PBQx-TCl eC9-2Cl form structures with diameters of ≈25 nm ternary films. Additionally, fine fibrils assembled PBDB-TF uniformly distributed over the networks eC9-2Cl. ideal enables achieve superior charge transfer transport processes compared binary systems; these improvements promote enhanced efficiency. Finally, high power conversion efficiency 19.51% single-junction OPV cell achieved. external quantum optimized exceeds 85% wide range 500-800 nm. A tandem also fabricated increase solar absorption. has an excellent PCE more than 20%. This study provides guidance for constructing improving

Язык: Английский

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Achieving 20.8% organic solar cells via additive-assisted layer-by-layer fabrication with bulk p-i-n structure and improved optical management

Joule, Год журнала: 2024, Номер 8(11), С. 3153 - 3168

Опубликована: Авг. 29, 2024

Язык: Английский

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Developing Efficient Small Molecule Acceptors with sp²‐Hybridized Nitrogen at Different Positions by Density Functional Theory Calculations, Molecular Dynamics Simulations and Machine Learning

Chemistry - A European Journal, Год журнала: 2021, Номер 28(2)

Опубликована: Ноя. 12, 2021

Chemical structure of small molecule acceptors determines their performance in organic solar cells. Multiscale simulations are necessary to avoid trial-and-error based design, ultimately save time and resources. In current study, the effect sp2 -hybridized nitrogen substitution at inner or outmost position central core, side chain, terminal group is investigated using multiscale computational modelling. Quantum chemical analysis used study electronic behavior. Nitrogen end-capping has significantly decreased electron-reorganization energy. No big change observed transfer integral excited state However, good way improve electron-mobility. Power conversion efficiency (PCE) newly designed predicted machine learning. Molecular dynamics also performed explore acceptor blends with PBDB-T polymer donor. Florgy-Huggins parameter calculated mixing PBDB-T. Radial distribution function indicated that a closer packing N3 N4. From all analysis, it found better strategy design efficient acceptors.

Язык: Английский

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From Solution to Thin Film: Molecular Assembly of π-Conjugated Systems and Impact on (Opto)electronic Properties

Chemical Reviews, Год журнала: 2023, Номер 123(13), С. 8395 - 8487

Опубликована: Июнь 5, 2023

The assembly of conjugated organic molecules from solution to solid-state plays a critical role in determining the thin film morphology and optoelectronic properties solution-processed electronics photovoltaics. During evaporative processing, π-conjugated systems can assemble via various forms intermolecular interactions, forming distinct aggregate structures that drastically tune charge transport landscape solid-state. In blend composed donor polymer acceptor molecules, neat materials couples with phase separation crystallization processes, leading complex transition pathways which govern morphology. this review, we provide an in-depth review molecular processes polymers nonfullerene small molecule acceptors discuss their impact on properties. We then shift our focus relevant solar cells fundamentals highlight how processing conditions affect device performance.

Язык: Английский

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Models and mechanisms of ternary organic solar cells

Nature Reviews Materials, Год журнала: 2023, Номер 8(7), С. 456 - 471

Опубликована: Март 17, 2023

Язык: Английский

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Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

Aggregate, Год журнала: 2022, Номер 3(6)

Опубликована: Окт. 13, 2022

Abstract The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have improved considerably in recent years with the development fused‐ring electron acceptors (FREAs). Currently, FREAs‐based OSCs achieved high PCEs over 19% single‐junction OSCs. Whereas relatively synthetic complexity and low yield FREAs typically result production costs, hindering commercial application In contrast, noncovalently (NFREAs) can compensate for shortcomings facilitate large‐scale industrial by virtue simple structure, facile synthesis, yield, cost, reasonable efficiency. At present, based on NFREAs exceeded 15% are expected to reach comparable efficiency as Here, advances this review provide insight into improving performance particular, paper focuses effect chemical structures molecule conformation, aggregation, packing mode. Various molecular design strategies, such core, side‐chain, terminal group engineering, presented. addition, some novel polymer all‐polymer also introduced. end, provides an outlook developing efficient, stable, low‐cost achieving applications.

Язык: Английский

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