Local Structure‐Induced Selective Interactions Enables High‐Performance and Burn‐in‐Free Organic Photovoltaics

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 30, 2024

Abstract Oligomeric acceptors (OAs) have attracted considerable attention in the organic photovoltaics (OPV) field owing to their capacity balancing merits from both monomeric and polymeric acceptors. A delicate control over distortion between blocks of OAs usually determines performance stability relevant OPV devices. However, it imposes great complexity realize a controllable degree by tuning skeleton position linker blocks. Herein, we developed facile strategy rationally geometry via straightforward substitution alkoxy side‐chains on This helps elucidate integrated influences molecular non‐bonded contacts selective interactions OA molecules host acceptor ternary blend. We demonstrate alkoxy‐OA having stronger self‐interactions would mitigate with acceptor, therefore alleviating kinetic diffusion excessive aggregation total Combining composite‐interlayer introducing phenyl‐substituted self‐assembled monolayer enhance doping polyoxometalate, an impressive efficiency 20.1 % is achieved accompanied negligible burn‐in loss against physical aging. study demonstrates validation towards high‐performance burn‐in‐free OPV.

Language: Английский

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U‐Shaped Dimeric Acceptors for Balancing Efficiency and Stability in Organic Solar Cells

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

Published: Nov. 27, 2024

Abstract Despite significant improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs), achieving excellent stability remains a great challenge to their commercial feasibility. Here, U ‐shaped dimeric acceptors (5‐IDT and 6‐IDT) with different molecular lengths are introduced into the binary OSCs as third component, respectively. The introduction component effectively reduces energetic disorder non‐radiative voltage losses improves exciton dissociation charge transport devices. Consequently, PCEs 6‐IDT‐ 5‐IDT‐treated significantly improved 19.32% 19.96%, respectively, which is highest PCE for oligomeric acceptors‐based ternary date. Meanwhile, thermal treated devices dramatically improved, initial efficiency retention increasing from 18% 32% 75%, after 1000 h stress. This mainly attributed ability smaller length 5‐IDT stabilize phase‐separated morphology polymeric donor small acceptor, rather than high glass transition temperature low diffusion coefficient.

Language: Английский

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Functionalized π-Bridges in Dimerized Acceptors Enable High-Performance Organic Solar Cells

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 111085 - 111085

Published: May 1, 2025

Language: Английский

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Linkage Regulation of Back‐To‐Back Connected Dimers as Guest Acceptors Enables Organic Solar Cells with Excellent Efficiency, Stability and Flexibility

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

Published: Sept. 18, 2024

Abstract High efficiency, stability, and flexibility are key prerequisites for the commercial applications of organic solar cells (OSCs). Herein, three back‐to‐back connected dimers (2Qx‐TT, 2Qx‐C3, 2Qx‐C6) developed as guest acceptors OSCs with improved comprehensive performance. By regulating linkage from rigid bithiophene to flexible alkyl chain, display quite different molecular geometry intermolecular interactions, consequently influencing their packing arrangement, film‐forming process, carrier mobilities, device flexibility. introducing these dimer into active layer, form alloy phases host acceptor, promoting process charge dynamics. All ternary devices exhibit PCEs over 18% than control binary device. Among them, 2Qx‐C3‐based obtains best efficiency high 19.03%. Moreover, thanks stronger entanglement favored by linkage, PM6:BTP‐eC9:2Qx‐C3‐based shows outstanding stability The displays an PCE 16.09% a crack‐onset strain 15.0%, showing excellent mechanical robustness close all‐polymer devices. This work demonstrates potential highly efficient, stable OSCs.

Language: Английский

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Recent Advances in Thermo- and Photostabilities of Organic Solar Cells: Material Design and Morphology Control

Polymer science & technology., Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Language: Английский

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Transparent and Conductive Polyimide‐Ionene Hybrid Interlayers for High Performance and Cost‐Effective Semitransparent Organic Solar Cells

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

Published: March 4, 2025

Abstract The contradiction between high transmittance and favorable conductivity poses a great challenge in developing effective cathode interlayer (CIL) materials with sufficient thickness tolerance, which hinders the further advancement of organic solar cells (OSCs). Herein, completely new class alcohol processable polyimide‐ionene hybrids (PIIHs) is proposed by melding pyromellitic diimide (PMD) subunits into imidazolium‐based ionenes backbone covalently. These PIIHs, named PMD‐DI PMD‐PD, boast transparency, suitable energy levels, decent conductivity. A higher PMD content endows PMD‐PD improved work function tunability, electrical properties, crystallinity, enabling as CIL material excellent thickness‐insensitive characteristics, while simultaneously improving device stability significantly. Furthermore, also exhibits good compatibility various electrodes active layers, offering cell efficiencies up to 19.91% 19.29% Ag Cu cathodes, respectively. More importantly, application can improve performance semi‐transparent OSCs without losing transmittance, thereby drastically enhancing light utilization efficiency 4.04% an ultrathin, low‐cost cathode, that competes leading optical modulation‐free semitransparent expensive cathodes. This opens pathway realize transparent conductive interlayers strategic molecular design, highly efficient, stable, cost‐effective for diverse applications.

Language: Английский

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Rational Regulation of Layer‐by‐Layer Processed Active Layer via Trimer‐Induced Pre‐Swelling Strategy for Efficient and Robust Thick‐Film Organic Solar Cells

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

Published: May 8, 2025

Abstract Thick‐film (>300 nm) organic solar cells (OSCs) have garnered intensifying attention due to their compatibility with commercial roll‐to‐roll printing technology for the large‐scale continuous fabrication process. However, uncontrollable donor/acceptor (D/A) arrangement in thick‐film condition, restricted exciton splitting and severe carrier traps significantly impede photovoltaic performance operability. Herein, combined layer‐by‐layer deposition technology, a twisted 3D star‐shaped trimer (BTT‐Out) is synthesized develop trimer‐induced pre‐swelling (TIP) strategy, where BTT‐Out incorporated into buried D18 donor layer enable of OSCs. The integrated approach characterizations reveal that exceptional configuration spontaneous self‐organization behavior could pre‐swell network facilitate acceptor's infiltration accelerate formation D/A interfaces. This enhancement triggers elevated polarons amplified hole‐transfer kinetics, which essential augmented efficiency. Furthermore, regulated swelling process can initiate favorable self‐assembly L8‐BO acceptors, would ameliorate transport channels mitigate traps. As result, TIP‐modified thin‐film OSC devices achieve champion 20.3% (thin‐film) 18.8% (thick‐film) upgraded stability, among one highest performances reported

Language: Английский

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Stability of Organic Photovoltaics: From Root Causes to Advanced Analytical Techniques

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

Published: May 10, 2025

Abstract The primary challenge in the commercialization of organic photovoltaics (OPVs) is ensuring long‐term stability, making study their degradation mechanisms essential. This centered on underlying degradation, providing a systematic and in‐depth analysis instability factors. A clear distinction between burn‐in loss established, with comprehensive examination governing each process. review highlights how pathways vary depending external environmental factors specific device layers, while also identifying key indicators for mitigating instability. Furthermore, this work extensively discusses analytical tools employed stability research, offering structured overview methodologies, obtained results, practical implications. Advanced high potential future applications are introduced, along principles prospective contributions to analysis. By integrating mechanistic perspective an exploration techniques, provides framework understanding OPV offers valuable insights into development effective stabilization strategies.

Language: Английский

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Enhanced Intramolecular Hole Transfer in Block Copolymer Enables >15% and Operational Stable Single‐Material–Organic Solar Cells

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

Published: Sept. 24, 2024

Abstract Recent studies on narrow bandgap all‐conjugated block copolymer (BCP) single‐material–organic solar cells (SMOSCs) have made unprecedented progress in power conversion efficiency (PCE); however, it still lacks understanding of the structure‐property relationship these highly mixed materials. Herein, impact different synthetic protocols (direct synthesis ( d ‐BCP) versus sequential s ‐BCP)) is first investigated relevant photovoltaic properties. Targeting same BCP, namely PBDB‐T‐ b ‐PYIT, found that change polymerization reaction leads to quite optical and transport The ‐BCP outputs a record‐high PCE 15.02% for SMOSCs as well enhanced operation stability under simulated 1‐sun illumination, which significantly higher than (10.33%) even close its bulk heterojunction (BHJ) counterparts. Detailed transient absorption spectroscopy reveals ultrafast dynamics charge transfer (CT) exciton dissociation BCP. In together with morphology characterization, revealed has more phase pure composition, molecular ordering, intramolecular CT relative those ‐BCP. These findings gain insight into both structure carrier dynamic BCP demonstrate possibility achieving high‐efficiency stable SMOSCs.

Language: Английский

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Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(11), P. 5541 - 5549

Published: Oct. 25, 2024

The efficiencies of dimer-based devices still lag those their small molecule-based counterparts. This is primarily due to the considerable dihedrals in dimer skeleton, which compromises molecular packing, thus influencing charge generation and nonradiative voltage loss (ΔVoc,nr). Herein, we developed two dimeric acceptors with varied π-linkers investigate influence linker-induced conformational lock on ΔVoc,nr. We find that helically lapped O-shaped delivers better intermolecular packing than planar S-shaped one incorporates a bulkier π-linker. However, its skeleton instead more favorable for forming compact ordered stacking host acceptor ternary blend. possibly promotes exciton dissociation, reducing decay excited states. Moreover, longer lifetime could offer additional charge-transfer channels. These contributions effectively minimize ΔVoc,nr 0.195 eV, while delivering high efficiency approaching 20% derived device.

Language: Английский

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