Benzo[d]thiazole Based Wide Bandgap Donor Polymers Enable 19.54% Efficiency Organic Solar Cells Along with Desirable Batch‐to‐Batch Reproducibility and General Applicability

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 4, 2023

Abstract The limited selection pool of high‐performance wide bandgap (WBG) polymer donors is a bottleneck problem the nonfullerene acceptor (NFA) based organic solar cells (OSCs) that impedes further improvement their photovoltaic performances. Herein, series new WBG polymers, namely PH‐BTz, PS‐BTz, PF‐BTz, and PCl‐BTz, are developed by using bicyclic difluoro‐benzo[d]thiazole (BTz) as block benzo[1,2‐b:4,5‐b′]dithiophene (BDT) derivatives donor units. By introducing S, F, Cl atoms to alkylthienyl sidechains on BDT, resulting polymers exhibit lowered energy levels enhanced aggregation properties. fluorinated PBTz‐F not only exhibits low‐lying HOMO level, but also has stronger face‐on packing order results in more uniform fibril‐like interpenetrating networks related PF‐BTz:L8‐BO blend. A high‐power conversion efficiency (PCE) 18.57% achieved. Moreover, good batch‐to‐batch reproducibility general applicability. In addition, ternary blend OSCs host PBTz‐F:L8‐BO PM6 guest PCE 19.54%, which among highest values OSCs.

Language: Английский

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19.7% efficiency binary organic solar cells achieved by selective core fluorination of nonfullerene electron acceptors

Joule, Journal Year: 2024, Volume and Issue: 8(3), P. 835 - 851

Published: Jan. 30, 2024

Language: Английский

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Donor–acceptor mutually diluted heterojunctions for layer-by-layer fabrication of high-performance organic solar cells

Nature Energy, Journal Year: 2024, Volume and Issue: 9(2), P. 208 - 218

Published: Jan. 9, 2024

Language: Английский

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Molecular interaction induced dual fibrils towards organic solar cells with certified efficiency over 20%

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 10, 2024

The nanoscale fibrillar morphology, featuring long-range structural order, provides abundant interfaces for efficient exciton dissociation and high-quality pathways effective charge transport, is a promising morphology high performance organic solar cells. Here, we synthesize thiophene terminated non-fullerene acceptor, L8-ThCl, to induce the fibrillization of both polymer donor host that surpasses 20% efficiency milestone After adding original weak less continuous nanofibrils donors, i.e. PM6 or D18, are well enlarged refined, whilst acceptor L8-BO also assembles into with enhanced order. By adapting layer-by-layer deposition method, order can be retained significantly boost power conversion efficiency, specific values 19.4% 20.1% PM6:L8-ThCl/L8-BO:L8-ThCl D18:L8-ThCl/L8-BO:L8-ThCl devices, latter being certified 20.0%, which highest reported so far single-junction

Language: Английский

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

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

Published: Aug. 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.

Language: Английский

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

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

Published: Oct. 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

Language: Английский

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

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(14)

Published: Jan. 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.

Language: Английский

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Suppressing electron-phonon coupling in organic photovoltaics for high-efficiency power conversion

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

Published: Aug. 21, 2023

The nonradiative energy loss (∆Enr) is a critical factor to limit the efficiency of organic solar cells. Generally, strong electron-phonon coupling induced by molecular motion generates fast decay and causes high ∆Enr. How restrict achieve low ∆Enr sticking point. Herein, free volume ratio (FVR) proposed as an indicator evaluate motion, providing new design rationale suppress decay. Theoretical experimental results indicate proper proliferation alkyl side-chain can decrease FVR leading reduced while maintaining ideal nanomorphology. favorable morphology are simultaneously obtained in AQx-6 with pinpoint chain proliferation, achieving PCE 18.6% optimized VOC, JSC FF. Our study discovered aggregation-state regulation great importance reduction coupling, which paves way high-efficiency OSCs.

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

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(15)

Published: July 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.

Language: Английский

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