Binary Organic Solar Cells with 19.2% Efficiency Enabled by Solid Additive

Advanced Materials, Год журнала: 2023, Номер 35(25)

Опубликована: Март 25, 2023

Morphology optimization is critical for achieving high efficiency and stable bulk-heterojunction (BHJ) organic solar cells (OSCs). Herein, the use of 3,5-dichlorobromobenzene (DCBB) with volatility low cost to manipulate evolution BHJ morphology improve operability photostability OSCs proposed. Systematic simulations reveal charge distribution DCBB its non-covalent interaction active layer materials. The addition can effectively tune aggregation PBQx-TF:eC9-2Cl during film formation, resulting in a favorable phase separation reinforced molecular packing. As result, power conversion 19.2% (certified as 19.0% by National Institute Metrology) DCBB-processed PBQx-TF:eC9-2Cl-based OSCs, which highest reported value binary obtained. Importantly, devices exhibit superior have thus considerable application potential printing large-area devices, demonstrating outstanding universality various systems. study provides facile approach control enhances photovoltaic performance OSCs.

Язык: Английский

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

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Окт. 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

Язык: Английский

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Electrostatic force promoted intermolecular stacking of polymer donors toward 19.4% efficiency binary organic solar cells

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Окт. 9, 2023

Conjugated polymers are generally featured with low structural order due to their aromatic and irregular units, which limits light absorption charge mobility in organic solar cells. In this work, we report a conjugated molecule INMB-F that can act as molecular bridge via electrostatic force enhance the intermolecular stacking of BDT-based polymer donors toward efficient stable Molecular dynamics simulations synchrotron X-ray measurements reveal electronegative adsorb on electropositive main chain increase donor-donor interactions, leading enhanced shortened π-π distance consequently transport ability. Casting non-fullerene acceptor layer top modified donor fabricate cells layer-by-layer deposition evidences significant power conversion efficiency boosts range photovoltaic systems. A 19.4% (certified 18.96%) is realized PM6/L8-BO binary devices, one highest reported efficiencies material system. The by also leads six-fold enhancement operational stability

Язык: Английский

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Mastering morphology of non-fullerene acceptors towards long-term stable organic solar cells

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 10, 2023

Despite the rapid progress of organic solar cells based on non-fullerene acceptors, simultaneously achieving high power conversion efficiency and long-term stability for commercialization requires sustainable research effort. Here, we demonstrate stable devices by integrating a wide bandgap electron-donating polymer (namely PTzBI-dF) two acceptors L8BO Y6) that feature similar structures yet different thermal morphological properties. The cell PTzBI-dF:L8BO:Y6 could achieve promising 18.26% in conventional device structure. In inverted structure, excellent over 1400 h under 85 °C continuous heating is obtained. improved performance can be ascribed to suppressed charge recombination along with appropriate transport. We find features terms crystalline coherence length fresh aged films gradually regulated weight ratio L8BO:Y6. Additionally, occurrence melting point decrease reduced enthalpy prohibit amorphous phase cluster, consequently overcome energetic traps accumulation aroused stress, which critical issue acceptors-based devices. This work provides insight into understanding stability.

Язык: Английский

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Recent Developments of Polymer Solar Cells with Photovoltaic Performance over 17%

Advanced Functional Materials, Год журнала: 2023, Номер 33(14)

Опубликована: Янв. 22, 2023

Abstract With the emergence of ADA'DA‐type (Y‐series) non‐fullerene acceptors (NFAs), power conversion efficiencies (PCEs) organic photovoltaic devices have been constantly refreshed and gradually reached 20% in recent years (19% for single junction tandem device). The possess specific design concept, which greatly enrich NFA types excellent compatibility with many donor materials. It is gratifying to note that previously underperforming materials combine these regulated shine again. Nowadays, concept modular widely used research donors, injecting new vitality into field photovoltaics. Furthermore, also promote multicomponent devices, bilayer processing solvent engineering, additive engineering. Herein, latest progresses polymer solar cells efficiency over 17% are briefly reviewed from aspects active material design, interface development, device technology. At last, opportunities challenges commercialization future discussed.

Язык: Английский

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

Energy & Environmental Science, Год журнала: 2023, Номер 16(8), С. 3441 - 3452

Опубликована: Янв. 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.

Язык: Английский

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

Advanced Materials, Год журнала: 2023, Номер 35(32)

Опубликована: Май 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.

Язык: Английский

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Hot‐Casting Strategy Empowers High‐Boiling Solvent‐Processed Organic Solar Cells with Over 18.5% Efficiency

Advanced Materials, Год журнала: 2023, Номер 36(3)

Опубликована: Авг. 9, 2023

Abstract Most top‐rank organic solar cells (OSCs) are manufactured by the halogenated solvent chloroform, which possesses a narrow processing window due to its low‐boiling point. Herein, based on two high‐boiling solvents, chlorobenzene (CB) and non‐halogenated green ortho‐xylene (OX), preparing active layers with hot solution is put forward enhance performance of OSCs. In situ test morphological characterization clarify that hot‐casting strategy assists in fast synchronous molecular assembly both donor acceptor layer, contributing preferable donor/acceptor ratio, vertical phase separation, stacking, beneficial charge generation extraction. Based PM6:BO‐4Cl, OSCs wide achieve efficiencies 18.03% CB 18.12% OX, much higher than devices processed room temperature solution. Moreover, PM6:BTP‐eC9 deliver remarkable fill factor 80.31% efficiency 18.52% representing record value among binary solvent. This work demonstrates facile manipulate distribution arrangement for boosting solvents.

Язык: Английский

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A Polycrystalline Polymer Donor as Pre‐Aggregate toward Ordered Molecular Aggregation for 19.3% Efficiency Binary Organic Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(41)

Опубликована: Июль 20, 2023

Organic semiconductors are generally featured with low structure order in solid-state films, which leads to charge-transport mobility and strong charge recombination their photovoltaic devices. In this work, a "polycrystal-induced aggregation" strategy orders the polymer donor (PM6) non-fullerene acceptor (L8-BO) molecules during solution casting assistance of PM6 polycrystals that incubated through vapor diffusion method, toward improved solar cell efficiency either thin or thick photoactive layers. These redissolved chloroform prepare pre-aggregates (PM6-PA), further incorporated into conventional PM6:L8-BO blend solutions, is found prolong molecular organization process enhance aggregation both L8-BO components. As results, 10% PM6-PA, devices obtain power conversion efficiencies (PCEs) from 18.0% 16.2% 19.3% 17.2% 100 nm-thick 300 layer, respectively.

Язык: 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, Год журнала: 2023, Номер 35(26)

Опубликована: Апрель 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.

Язык: Английский

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