Isomerization Engineering of Solid Additives Enables Highly Efficient Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Active Layer

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(33)

Published: June 20, 2024

Morphology control is crucial in achieving high-performance organic solar cells (OSCs) and remains a major challenge the field of OSC. Solid additive an effective strategy to fine-tune morphology, however, mechanism underlying isomeric solid additives on blend morphology OSC performance still vague urgently requires further investigation. Herein, two based pyridazine or pyrimidine as core units, M1 M2, are designed synthesized explore working OSCs. The smaller steric hindrance larger dipole moment facilitate better π-π stacking aggregation M1-based active layer. M1-treated all-small-molecule OSCs (ASM OSCs) obtain impressive efficiency 17.57%, ranking among highest values for binary ASM OSCs, with 16.70% M2-treated counterparts. Moreover, it imperative investigate whether isomerization engineering works state-of-the-art polymer D18-Cl:PM6:L8-BO-based devices achieve exceptional 19.70% (certified 19.34%), work provides deep insights into design clarifies potential optimizing device through additives.

Language: Английский

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Over 19.2% Efficiency of Layer‐By‐Layer Organic Photovoltaics by Ameliorating Exciton Dissociation and Charge Transport

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 26, 2025

Abstract Layer‐by‐layer (LbL) organic photovoltaics (OPVs) are fabricated with polymer PM1 as donor and small molecule L8‐BO acceptor by employing sequential spin‐coating technology. The BTP‐eC9 PTAA deliberately selected for individually incorporating into layer layer, resulting in the power conversion efficiency (PCE) increased from 18.22% to 19.23%. improvement of performance is attributed synergistically short circuit current density ( J SC ) 27.78 mA cm −2 fill factor (FF) 78.23%. introduction can promote photogenerated exciton dissociation, especially excitons near anode. Meanwhile, molecular crystallinity also enhanced appropriate layer. incorporation provide hole transport channels effectively improve holes generated self‐dissociation L8‐BO, FFs 77.40% synergistic effects layers result a 19.23% PCE optimized LbL‐OPVs. This work demonstrates that there great room hierarchically optimize achieving highly efficient

Language: Английский

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High-performance organic solar cells enabled by the p-i-n structure and ternary strategy

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(37), P. 24862 - 24871

Published: Jan. 1, 2024

The layer-by-layer (LBL) strategy is an efficient way to improve the power conversion efficiency (PCE) of organic solar cells (OSCs) due their superiorities in vertical component distribution.

Language: Английский

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Layer‐by‐Layer Processed Pseudo‐Bilayer Heterojunctions Advance the Performance of Organic Solar Cells

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Recent progress in organic (semiconductor) solar cells (OSCs) has led to power conversion efficiencies (PCEs) reaching 20%, with predictions that 25% may be possible. Additional PCE improvements, significant efforts have been made address the engineering challenges traditionally limited OSCs small area devices often poor temporal stability. Layer‐by‐layer (LbL) processing of active layers emerged as a promising approach tackle these challenges, numerous state‐of‐the‐art processed using LbL reported. In this Perspective, recent developments are developed enhancing OSC efficiency and stability, particular focus on working mechanisms pseudo‐bilayer heterojunctions (P‐BHJ) practical aspects fabricating high‐performance techniques. By providing insights into resultant film morphology, it is hoped contribute ongoing improve efficiency, scalability explore their potential for broader applications such example indoor light harvesting or agrivoltaics.

Language: Английский

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19.5%‐Efficiency Organic Solar Cells with High Thickness Tolerance and Exceptional Device Stability Enabled by TEMPO‐Functionalized Perylene Diimide as a Cathode Interface Layer

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 15, 2024

Abstract The cathode interface material is pivotal for achieving excellent photovoltaic performance and device stability in organic solar cells (OSCs). However, currently, few materials can simultaneously satisfy multiple criteria such as low cost, high efficiency, insensitivity to film thickness, good stability. To address this challenge, a novel perylene diimide (PDI) derivative, P‐C3T designed synthesized, by incorporating stable free radical unit TEMPO polar quaternary ammonium salt side chains. facile synthesize cost‐effective, while also exhibiting conductivity ohmic contact characteristics OSCs. When utilized the material, based on D18:L8‐BO achieves remarkable power conversion efficiency (PCE) of 19.52%, which one highest levels reported binary single‐junction Notably, devices exhibit with PCE remaining at 95% initial even thickness 40 nm. Furthermore, ‐based OSCs demonstrate exceptional storage improved light In summary, its PCE, insensitivity, stability, anticipated be promising candidate large‐area roll‐to‐roll processing

Language: Английский

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17.2% Efficiency for Completely Non‐Fused Acceptor Organic Solar Cells Via Re‐Intermixing Strategy in D/A Stratified Active Layer

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Pursuing power conversion efficiency (PCE) is the priority of developing organic solar cells (OSCs) based on low‐cost completely non‐fused ring acceptors. Herein, a donor/acceptor re‐intermixing strategy to enhance photon capturing process, previously established well‐stratified active layer morphology reported. By adding 20 wt% PTQ10 (polymer donor) into acceptor's precursor, device PCE increased 16.03% from 15.11% D18/A4T‐16 control system, which attributed additional charge generation interface and suppressed bimolecular recombination. On contrary, using equal ratio PM6 leads significant loss, indicating importance considering vertical distribution perspective thermodynamics. Moreover, cutting‐edge level 17.21% for acceptor systems realized by altering PBQx‐TF/TBT‐26 PTQ11, via identical processing strategy. This work thus presents attractive engineering cell performance, as well in‐depth understanding.

Language: Английский

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Efficient and Stable Organic Solar Cells Achieved by Synergistic Optimization of Extended End‐Capped Groups and Fluorinated Quinoxaline Central Cores in Nonfullerene Acceptors

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 14, 2024

Abstract Molecular stacking behavior exerts a significant influence on the blend film morphology of organic solar cells (OSCs), further affecting device performance and stability. Modulation molecular structure, such as central unit end‐group, can profoundly impact this process. Herein, four quinoxaline (Qx)‐fused‐core‐based non‐fullerene acceptors (NFAs), Qx‐N4F Qx‐ o/m/p ‐N4F are synthesized combining π‐extended end‐groups optimized units. The isomeric fluorinated units lead to changes in local dipole moments electrostatic potential distribution, which influences pattern photoelectronic properties NFAs. Consequently, binary ternary devices based PM6:Qx‐ p achieve superior power conversion efficiencies (PCE) up 18.75% 19.48%, respectively. Grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) characterization reveals ‐N4F's stronger crystallinity, aggregation, donor–acceptor interactions, separately enhance short‐circuit current density ( J SC ) fill factor (FF) through higher phase purity tighter maintaining more interfaces. Furthermore, ‐N4F‐based demonstrate exceptional thermal stability, retaining 93.2% initial PCE value after 3000 h heating due best morphological stability with most stable structure. These results underscore significance synergistic optimization NFAs conjugation expansion halogenation substitution for obtaining efficient OSCs.

Language: Английский

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Upper Layer‐Modulated Pseudo Planar Heterojunction with Metal Complex Acceptor for Efficient and Stable Organic Photovoltaics

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Modulating self-aggregation and charge transport in the upper acceptor layer of pseudo planar heterojunction (PPHJ) is crucial for enhancing dielectric constant suppressing trap density, leading to efficient stable organic photovoltaics (OPVs). In this work, a metal complex (MCA), PtAC-Cl, selectively incorporated into host Y6 PPHJ regulate morphology fill states. There exists strong chemical interaction between PtAC-Cl Y6, which can promote electron transfer. extend exciton diffusion length resulting enhanced reduced energetic disorder. Consequently, layer-modulated devices with achieved significant power conversion efficiency 18.16%. The universality also demonstrated PM6/eC9 PM6/L8-BO systems, achieving highest PCEs 18.79 19.30%, respectively. All improved are mainly attributed factor (FF) short circuit current (J

Language: Английский

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Vertical phase separation and morphology optimization of layer-by-layer non-fullerene organic solar cells

Journal of Central South University, Journal Year: 2024, Volume and Issue: 31(12), P. 4338 - 4365

Published: Dec. 1, 2024

Language: Английский

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