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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Self‐Assembled Interlayer Enables High‐Performance Organic Photovoltaics with Power Conversion Efficiency Exceeding 20%

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Март 21, 2024

Interfacial layers (ILs) are prerequisites to form the selective charge transport for high-performance organic photovoltaics (OPVs) but mostly result in considerable parasitic absorption loss. Trimming ILs down a mono-molecular level via self-assembled monolayer is an effective strategy mitigate However, such suffers from inferior electrical contact with low surface coverage on rough surfaces and poor producibility. To address these issues, here, interlayer (SAI) developed, which involves thin layer of 2-6 nm full substrate both covalent van der Waals bonds by using molecule 2-(9H-carbazol-9-yl) (2PACz). Via facile spin coating without further rinsing annealing process, it not only optimizes optical properties OPVs, enables world-record efficiency 20.17% (19.79% certified) also simplifies tedious processing procedure. Moreover, SAI especially useful improving absorbing selectivity semi-transparent record light utilization 5.34%. This work provides optimize OPVs solar window applications.

Язык: Английский

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A rare case of brominated small molecule acceptors for high-efficiency organic solar cells

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

Опубликована: Авг. 5, 2023

Abstract Given that bromine possesses similar properties but extra merits of easily synthesizing and polarizing comparing to homomorphic fluorine chlorine, it is quite surprising very rare high-performance brominated small molecule acceptors have been reported. This may be caused by undesirable film morphologies stemming from relatively larger steric hindrance excessive crystallinity bromides. To maximize the advantages bromides while circumventing weaknesses, three (CH20, CH21 CH22) are constructed with stepwise brominating on central units rather than conventional end groups, thus enhancing intermolecular packing, dielectric constant them without damaging favorable packing through groups. Consequently, PM6:CH22-based binary organic solar cells render highest efficiency 19.06% for acceptors, more excitingly, a record-breaking 15.70% when further thickening active layers ~500 nm. By exhibiting such acceptor, our work highlights great potential achieving delicately brominating.

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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Recent Progress in π-Conjugated Polymers for Organic Photovoltaics: Solar Cells and Photodetectors

Progress in Polymer Science, Год журнала: 2023, Номер 143, С. 101711 - 101711

Опубликована: Июнь 25, 2023

Язык: Английский

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Achieving 19.4% organic solar cell via an in situ formation of p-i-n structure with built-in interpenetrating network

Joule, Год журнала: 2024, Номер 8(2), С. 509 - 526

Опубликована: Янв. 11, 2024

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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Tunable Donor Aggregation Dominance in a Ternary Matrix of All‐Polymer Blends with Improved Efficiency and Stability

Advanced Materials, Год журнала: 2023, Номер 36(15)

Опубликована: Июль 7, 2023

Abstract Using two structurally similar polymer acceptors in constructing high‐efficiency ternary all‐polymer solar cells is a widely acknowledged strategy; however, the focus thus far has not been on how acceptor(s) would tune aggregation of donors, and furthermore film morphology device performance (efficiency stability). Herein, it reported that matching celebrity acceptor PY‐IT donor PBQx‐TCl results enhanced H ‐ PBQx‐TCl, which can be finely tuned by controlling amount second PY‐IV. Consequently, efficiency‐optimized PY‐IV weight ratio (0.2/1.2) leads to state‐of‐the‐art power conversion efficiency 18.81%, wherein light‐illuminated operational stability also along with well‐protected thermal stability. Such enhancements stabilities attributed optimization desired glass transition temperature target active layer based comprehensive characterization. In addition being high‐power case for cells, these are successful attempt using combined toward optimal morphology, provides theoretical basis construction other types organic photovoltaics beyond cells.

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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Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2% Efficiency Ortho-Xylene Processed Organic Solar Cells

Nano-Micro Letters, Год журнала: 2023, Номер 16(1)

Опубликована: Ноя. 23, 2023

Abstract With plenty of popular and effective ternary organic solar cells (OSCs) construction strategies proposed applied, its power conversion efficiencies (PCEs) have come to a new level over 19% in single-junction devices. However, previous studies are heavily based chloroform (CF) leaving behind substantial knowledge deficiencies understanding the influence solvent choice when introducing third component. Herein, we present case where newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy, named BTP-BO-3FO with enlarged bandgap, brings different morphological evolution performance improvement effect on host system PM6:BTP-eC9, processed by CF ortho-xylene ( o -XY). detailed analyses supported series experiments, best PCE 19.24% for green solvent-processed OSCs is found be fruit finely tuned crystalline ordering general aggregation motif, which furthermore nourishes favorable charge generation recombination behavior. Likewise, can achieved replacing spin-coating blade coating active layer deposition. This work focuses commonly met yet frequently ignored issues building blends demonstrate cutting-edge device performance, hence, will instructive other OSC works future.

Язык: Английский

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