Organic Solar Cells with Over 19% Efficiency Enabled by a 2D‐Conjugated Non‐Fullerene Acceptor Featuring Favorable Electronic and Aggregation Structures

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(32)

Published: May 27, 2023

The π-expansion of non-fullerene acceptors is a promising method for boosting the organic photovoltaic performance by allowing fine-tuning electronic structures and molecular packing. In this work, highly efficient solar cells (OSCs) are fabricated using 2D strategy to design new acceptors. Compared with quinoxaline-fused cores AQx-16, π-expanded phenazine-fused AQx-18 induce more ordered compact packing between adjacent molecules, affording an optimized morphology rational phase separation in blend film. This facilitates exciton dissociation inhibited charge recombination. Consequently, power conversion efficiency (PCE) 18.2% simultaneously increasing Voc , Jsc fill factor achieved AQx-18-based binary OSCs. Significantly, ternary devices via two-in-one alloy acceptor exhibit superior PCE 19.1%, one highest values ever reported OSCs, along high 0.928 V. These results indicate importance delicate regulation crystalline behaviors achieve performance, aimed at significantly promoting further development

Language: Английский

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

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(16)

Published: Jan. 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

Language: Английский

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Auxiliary sequential deposition enables 19%-efficiency organic solar cells processed from halogen-free solvents

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 31, 2023

High-efficiency organic solar cells are often achieved using toxic halogenated solvents and additives that constrained in industry. Therefore, it is important to develop materials or processing methods enabled highly efficient processed by halogen free solvents. In this paper, we report an innovative method named auxiliary sequential deposition enables 19%-efficiency Our different from the conventional blend casting involves additional of dithieno[3,2-b:2',3'-d]thiophene between depositions donor (D18-Cl) acceptor (L8-BO) layers. The dramatic performance enhancement 15% over 18% compared methods. Furthermore, incorporating a branched-chain-engineered called L8-BO-X, device can be boosted 19% due increased intermolecular packing, representing top-tier values for green-solvent cells. Comprehensive morphological time-resolved characterizations reveal superior morphology through promotes charge generation while simultaneously suppressing recombination. This research underscores potential fabricating environmentally friendly

Language: Английский

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Restrained energetic disorder for high-efficiency organic solar cells via a solid additive

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(6), P. 2637 - 2645

Published: Jan. 1, 2023

A new morphology regulation approach using solid additive, 1,3,5-trimethoxybenzene, can restrict energetic disorder and optimize the nanoscale of organic solar cells, achieves a high power conversion efficiency 19.30%.

Language: Английский

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Ternary All‐Polymer Solar Cells with Efficiency up to 18.14% Employing a Two‐Step Sequential Deposition

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(7)

Published: Nov. 22, 2022

Abstract Achieving a finely tuned active layer morphology with suitable vertical phase to facilitate both charge generation and transport has long been the main goal for pursuing highly efficient bulk heterojunction all‐polymer solar cells (all‐PSCs). Herein, solution address above challenge via synergistically combining ternary blend strategy layer‐by‐layer (LbL) procedure is proposed. By introducing synthesized polymer acceptor ( P A ), PY‐Cl, higher crystallinity into designed host PY‐SSe‐V, distribution molecular ordering of LbL‐type all‐PSCs can be improved in comparison PM6/PY‐SSe‐V binary all‐PSCs. The formation superior microstructure not only promote extraction properties but also reduce energetic disorder non‐radiative recombination loss, thus improving all three photovoltaic parameters simultaneously. Consequently, PM6/(PY‐SSe‐V:PY‐Cl) show best efficiency 18.14%, which among highest values reported date This work provides facile effective obtaining high‐efficiency

Language: Английский

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Non‐halogenated Solvent‐Processed Organic Solar Cells with Approaching 20 % Efficiency and Improved Photostability

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(22)

Published: March 25, 2024

The development of high-efficiency organic solar cells (OSCs) processed from non-halogenated solvents is crucially important for their scale-up industry production. However, owing to the difficulty regulating molecular aggregation, there a huge efficiency gap between and halogenated solvent OSCs. Herein, we fabricate o-xylene OSCs with approaching 20 % by incorporating trimeric guest acceptor named Tri-V into PM6:L8-BO-X host blend. incorporation effectively restricts excessive aggregation L8-BO-X, regulates packing optimizes phase-separation morphology, which leads mitigated trap density states, reduced energy loss suppressed charge recombination. Consequently, PM6:L8-BO-X:Tri-V-based device achieves an 19.82 %, representing highest solvent-processed reported date. Noticeably, addition Tri-V, ternary shows improved photostability than binary PM6:L8-BO-X-based device, maintains 80 initial after continuous illumination 1380 h. This work provides feasible approach fabricating high-efficiency, stable, eco-friendly OSCs, sheds new light on large-scale industrial production

Language: Английский

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Film-formation dynamics coordinated by intermediate state engineering enables efficient thickness-insensitive organic solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(8), P. 3441 - 3452

Published: Jan. 1, 2023

In this work, by adding a low-cost and volatile 1,3,5-tribromobenzene solid as process-aid additive, champion power conversion efficiency high 19.1% together with remarkable fill factor of 80.7% is achieved based on the state-of-the-art PM6:L8-BO system.

Language: Английский

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Understanding the Role of Removable Solid Additives: Selective Interaction Contributes to Vertical Component Distributions

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(32)

Published: May 11, 2023

Abstract Sequentially deposited organic solar cells (SD‐OSCs) have attracted great attention owing to their ability in achieving a more favorable, vertically phase‐separated morphology avoid the accumulation of counter charges at absorber/transporting layer interfaces. However, processing SD‐OSCs is still quite challenging preventing penetration small‐molecule acceptors into polymer donor via erosion or swelling. Herein, solid additives (SAs) with varied electrostatic potential distributions and steric hinderance are introduced investigate effect evaporation dynamics selective interaction on vertical component distribution. Multiple modelings indicate that π – dominates interactions between aromatic SAs active components. Among them, p ‐dibromobenzene shows stronger while 2‐chloronaphthalene (2‐CN) interacts preferably acceptor. Combining depth‐dependent morphological study aided by multiple X‐ray scattering methods, it concluded can drive stronger‐interaction upward surface, having minor impact overall molecular packing. Ultimately, 2‐CN‐treated devices reduced acceptor concentration bottom surface deliver high power conversion efficiency 19.2%, demonstrating effectiveness applying improve OSCs using proper structure.

Language: Английский

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An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(26)

Published: April 12, 2023

Abstract Currently, nearly all high‐efficiency organic photovoltaic devices use donor polymers based on the benzo‐dithiophene (BDT) unit. To diversify choices of building blocks for high‐performance polymers, benzo‐difuran (BDF) units is explored, which can achieve reduced steric hindrance, stronger molecular packing, and tunable energy levels. In previous research, performance BDF‐based lagged behind those BDT‐based devices. this study, a high efficiency (18.4%) achieved using polymer donor, highest reported BDF materials to date. The enabled by (D18‐Fu) aid solid additive (2‐chloronaphthalene), isomer commonly used 1‐chloronaphthalene. These results revealed significant effect 2‐chloronaphthalene in optimizing morphology enhancing device parameters. This work not only provides new block that an comparable dominant BDT but also proposes replace widely 1‐chloronaphthalene additive.

Language: 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, Journal Year: 2023, Volume and Issue: 15(1)

Published: Nov. 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.

Language: Английский

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