Cyano-functionalized pyrazine: an electron-deficient unit as a solid additive enables binary organic solar cells with 19.67% efficiency

Energy & Environmental Science, Год журнала: 2024, Номер 17(10), С. 3365 - 3374

Опубликована: Янв. 1, 2024

A strong electron-deficient unit CNPz as a solid additive was developed in PTQ10/ m -BTP-PhC6 binary organic solar cells. high PCE of 19.67% achieved with significant increase the J SC and FF (81.8%).

Язык: Английский

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Tailoring Cyano Substitutions on Quinoxaline‐based Small‐Molecule Acceptors Enabling Enhanced Molecular Packing for High‐Performance Organic Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер 14(30)

Опубликована: Май 11, 2024

Abstract Cyanation is a common chemical modification strategy to fine‐tune the energy levels and molecular packing of organic semiconductors, especially materials used in solar cells (OSCs). Generally, cyanation modify end groups high‐performance small‐molecule acceptors (SMAs). However, has not been investigated on central backbone SMAs, which could introduce stronger intermolecular interaction enhance π–π stacking for rapid charge transport. This paper, first time, reports new benzo‐quinoxaline core synthesizes two novel A‐DA'D‐A type named BQx‐CN BQx‐2CN, with mono‐ di‐cyanide groups, respectively. Through tailoring number CN BQx‐CN‐based OSC exhibits best device performance 18.8%, significantly higher than non‐cyano BQx‐based one. The reason superior devices can be attributed fine‐tuned level, packing, ideal phase segregation, lead exciton dissociation, faster transport, suppressed recombination, therefore highest fill factor (FF) power conversion efficiencies (PCE). research demonstrates effectiveness SMAs enhanced better OSCs.

Язык: Английский

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Effect of 1‐Fluoro‐2‐iodobenzene Solvent Additive on the Crystallization of Donors and Acceptors, and Ultrafast Carrier Dynamics in Polymer Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 34(13)

Опубликована: Дек. 15, 2023

Abstract Controlled sequential crystallization of donors and acceptors is a critical factor for achieving enhanced phase separation efficient charge transfer performance in polymer solar cells (PSCs). In this study, comprehensive investigation structurally simple solvent additive, 1‐fluoro‐2‐iodobenzene (OFIB) conducted, which efficiently controls the morphology active layer, resulting fibrous assembly significantly enhancing power conversion efficiency from 16.34% to 18.38% based on PM6:L8‐BO system. Density functional theory, molecular dynamics simulations, grazing incidence small‐ wide‐angle X‐ray scattering techniques reveal that addition OFIB processed blend aligns orientation acceptor molecules, thereby overall π–π stacking layer. establishes nearly equal‐strength interactions with conjugated frameworks both donor materials, benefiting multiple electron conjugation between its iodine atom framework Femtosecond‐timescale photophysical studies demonstrate OFIB‐optimized layer shows reduced exciton losses at donor–acceptor interface. This study offers new perspective mechanism underlying function additives presents research methodology will guide development next‐generation non‐fullerene PSCs.

Язык: Английский

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19% efficiency in organic solar cells of Benzo[1,2-b:4,5-b′]Difuran-based donor polymer realized by volatile + non-volatile dual-solid-additive strategy

Materials Science and Engineering R Reports, Год журнала: 2024, Номер 159, С. 100794 - 100794

Опубликована: Апрель 13, 2024

Язык: Английский

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Cost-effective polymer donors based on pyridine for efficient nonfullerene polymer solar cells

Polymer, Год журнала: 2024, Номер 299, С. 126926 - 126926

Опубликована: Март 23, 2024

Язык: Английский

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Exploiting the donor‐acceptor‐additive interaction's morphological effect on the performance of organic solar cells

Aggregate, Год журнала: 2023, Номер 5(2)

Опубликована: Ноя. 6, 2023

Abstract Organic solar cells (OSCs) have demonstrated over 19% power conversion efficiency (PCE) with the help of material innovation and device optimization. Co‐working newly designed materials, traditional solvent additives, 1‐chloronaphthalene (CN), 1,8‐diodooctane (DIO) are still powerful in morphology modulation towards satisfying efficiencies. Here, we chose recently reported high‐performance polymer donors (PM6 & D18‐Fu) small molecular acceptors (Y6 L8‐BO) as active layer materials processed them by different conditions (CN or DIO none). Based on corresponding 12 groups results, their film characterizations (both ex‐situ in‐situ ones), property‐performance relationships revealed case case. It is thereby supposed to be taken a successful attempt demonstrate importance complexity donor‐acceptor‐additive interaction, since performance physics analyses also tightly combined variation. Furthermore, ternary blend construction for PCE improvement provides an approaching level showcases potential understanding‐guided‐optimization (UGO) future OSCs.

Язык: Английский

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A facile synthetic approach based on thieno[3,4-c]pyrrole-4,6-dione to construct polymer donors for highly efficient organic solar cells

Energy & Environmental Science, Год журнала: 2023, Номер 16(9), С. 3942 - 3950

Опубликована: Янв. 1, 2023

A new facile synthetic approach enables TPD derivatives to become part of the simple A-unit family in OSCs.

Язык: Английский

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Designer Conjugation-Break Spacer That Boosts Charge Transport in Semiconducting Terpolymers

Macromolecules, Год журнала: 2024, Номер 57(12), С. 5902 - 5914

Опубликована: Июнь 5, 2024

Conjugated polymers (CPs) are pivotal for high-mobility applications, typically avoiding nonconjugated units due to their perceived negative impact on charge transport. Contrary this belief, our study introduces a unit, DKPDO, which when employed as conjugation-break spacer (CBS), significantly enhances DKPDO was obtained center-modified isoindigo variant featuring strongly electron-withdrawing amide groups that diminish the electron density and foster multiple hydrogen-bonding interactions. This results in enhanced deficiency reinforced coplanarity relative isoindigo. incorporated into polymer backbone, comprising bithiophene, create series of terpolymers with varied molar ratios, allowing systematic evaluation solubilities, interchain interactions, crystallinities, energy levels. Notably, incorporating universal improvement hole mobilities operational stabilities over DKPDO-free counterpart. Remarkably, terpolymer containing 2.5% achieves high mobility 4.12 cm2 V–1 s–1, approximately 6-fold higher than parent CP among highest CPs based center-inserted units. The not only, first time, realizes transport enhancement CBS backbones but also sets precedent strategic use developing high-performing CPs.

Язык: Английский

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Structure–Activity Relationship between Crystallinity and Carrier Transport of Two-Dimensional Donor Units in Organic Solar Cells

The Journal of Physical Chemistry Letters, Год журнала: 2024, Номер 15(2), С. 514 - 524

Опубликована: Янв. 9, 2024

Benzo[1,2-b:4,5-b′]dithiophene (BDT) and its derivatives have made important contributions to constructing high-performance polymers. However, it is difficult clarify the real role of donor units due interference strong electronegativity crystallinity acceptor in D–A copolymer. Here, we design a cyclohexane-substituted dithieno[3,2-f:2′,3′-h]quinoxaline (DTQ)-based unit with successfully destroyed charge transport. Three donor-dominated materials PQH-BTF, PQH-BTCl, PQH-BFCl are obtained. It found that exhibit obvious differences after destroying crystallization transport unit, different two-dimensional designed polymers confirmed. The backbone BDF exhibits much stronger intermolecular interactions compared BDT, while side chain ThF demonstrates higher capacity than ThCl. More interestingly, can be inferred molecular likely construct miscible-phase (D–A crystal) tends demonstrate for pure-phase (D–D 2D system. Different leads exciton transport: conducive reduction trap-assisted recombination, miscible beneficial bimolecular recombination. This work help choose more accurately when preparing copolymers.

Язык: Английский

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Halogen-Free Wide Band Gap Polymer Donors Based on Dicyanobithiophene for Efficient Organic Solar Cells

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Янв. 15, 2025

Conjugated polymer donors have always been one of the important components organic solar cells (OSCs), particularly those featuring simple synthetic routes, proper energy levels, and appropriate aggregation behavior. In this work, we employed a nonfused electron-deficient building block, dicyanobithiophene (2CT), for constructing high-performance donors. Combining with side-chain engineering, two novel halogen-free donors, PB2CT-BO PB2CT-HD, were reported. shorter alkyl chains on thiophene π bridges exhibited enhanced packing ordering improved crystallinity. When paired BTP-CN-HD as electron acceptor, PB2CT-BO-based OSC attained an impressive power conversion efficiency (PCE) 14.2% within bulk-heterojunction (BHJ) configuration. Additionally, active layers refined through layer-by-layer (LbL) approach, leading to more organized molecular fibrillar network. Consequently, employing processed LbL approach achieved notable PCE 15.3%. This enhancement is credited reduced loss (Eloss) 0.514 eV formation favorable morphology. study highlights considerable promise 2CT unit in progression high-efficiency Eloss.

Язык: Английский

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