π-Extended Nonfullerene Acceptor for Compressed Molecular Packing in Organic Solar Cells To Achieve over 20% Efficiency

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(17), P. 12011 - 12019

Published: April 19, 2024

Organic photovoltaics (OPVs) suffer from a trade-off between efficient charge transport and suppressed nonradiative recombination due to the aggregation-induced luminance quenching of organic semiconductors. To resolve this grand challenge, π-extended nonfullerene acceptor (NFA) B6Cl with large voids among honeycomb network is designed introduced into photovoltaic systems. We find that presence small amount (i.e., 0.5 or 1 wt %) can compress molecular packing host L8-BO, leading shortened π–π stacking distance 3.59 3.50 Å (that will improve transport) together ordered alkyl chain inhibit energy loss C–C C–H bonds vibrations), as validated by high-energy X-ray scattering measurements. This morphology transformation ultimately results in simultaneously improved JSC, FF, VOC OPVs. As result, maximum PCEs PM6:L8-BO D18:L8-BO are increased 19.1 19.3% 19.8 20.2%, respectively, which highest values for single-junction The university increase performance OPVs further evidenced range polymer:NFA

Language: Английский

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Achieving Record‐High Stretchability and Mechanical Stability in Organic Photovoltaic Blends with a Dilute‐absorber Strategy

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(8)

Published: Oct. 22, 2023

Organic solar cells (OSCs) have potential for applications in wearable electronics. Except high power conversion efficiency (PCE), excellent tensile properties and mechanical stability are required achieving high-performance OSCs, while the present metrics barely meet stretchable requirements. Herein, this work proposes a facile low-cost strategy constructing intrinsically OSCs by introducing readily accessible polymer elastomer as diluent all-polymer photovoltaic blends. Remarkably, record-high stretchability with fracture strain of up to 1000% elastic recovery >90% under cyclic tests realized active layers first time. Specifically, best-performing blends increased 250 times after blending. Previously unattainable performance (fracture >50% PCE >10%) achieved simultaneously resulting films. Furthermore, an overall evaluation parameter y is proposed efficiency-cost- balance blend The value dilute-absorber system two orders magnitude greater than those prior state-of-the-art systems. Additionally, devices prepared showcase stability. Overall, offers new avenue comprehensively evaluating organic electronic

Language: Английский

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Intrinsically Stretchable Organic Photovoltaic Cells with Improved Mechanical Durability and Stability via Dual‐Donor Polymer Blending

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(29)

Published: Feb. 8, 2024

Abstract Intrinsically stretchable organic photovoltaic cells (OPVs) have garnered significant attention as crucial devices for powering next‐generation wearable electronics. Despite the rapid power conversion efficiency gains in champion OPVs, their brittle stretchability has failed to meet demands of Internet Things era, severely hindering further development and practical applications. In this regard, a new dual‐donor polymer blending strategy is demonstrated constructing intrinsically OPVs by designing novel high‐molecular–weight conjugated PM6‐HD. This PM6 derivative featuring long alkyl chains can reach sufficiently high molecular weight thus exhibits fracture strain exceeding 90%, which ≈12 times higher than benchmark PM6. Synergistic optimization mechanical properties performance polymer:small molecule all‐polymer systems constructed from physical blends PM6‐HD achieved. Crucially, resulting OPV demonstrates excellent stability, with record PCE 80% 50.3% retention above even after 1000 cycles cyclic stretching at strains. work contributes advancement technology opens up possibilities its integration into electronic devices.

Language: Английский

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Control over the aggregated structure of donor–acceptor conjugated polymer films for high‐mobility organic field‐effect transistors

Aggregate, Journal Year: 2024, Volume and Issue: 5(3)

Published: Jan. 15, 2024

Abstract Donor–acceptor (D‐A) conjugated polymers have demonstrated great potential in organic field‐effect transistors application, and their aggregated structure is a crucial factor for high charge mobility. However, the of D‐A polymer films complex structure–property relationship difficult to understand. This review provides an overview recent progress controlling higher mobility, including mechanisms, methods, properties. We first discuss multilevel microstructures films, then summarize current understanding between film transport Subsequently, we theory crystallization. After that, common methods control semi‐crystalline near‐amorphous such as crystallites aggregates, tie chains, alignment, attempt understand them from basic Finally, provide challenges relationship.

Language: Английский

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Unveiling the Strain‐induced Microstructural Evolution and Morphology‐Stretchability Correlations of Intrinsically Stretchable Organic Photovoltaic Films

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(18)

Published: Feb. 9, 2024

Abstract The progress of stretchable and wearable photovoltaics relies heavily on intrinsically active layer films. Nevertheless, there is a paucity research clarifying the connections between their microstructure, performance, adaptation to large strain in polymer electronic current study utilizes multiple synchrotron X‐ray scattering methods collectively examine correlations morphology stretchability, as well microstructural evolution induced by stretching three sample cases highly ternary blend These blends contain over 30% weight elastomer, such styrene‐ethylene‐butylene‐styrene block copolymer, integrated into high‐performance polymer:nonfullerene small molecule mixture. Specifically, real‐time changes these durable organic photovoltaic films with elastomers are monitored when subjected tensile through situ scattering. experiments demonstrate that polymeric can effectively lower degree crystallinity deform crystallites semiconductor molecules. elastomeric component aids stress dispersion during stretching, thereby improving durability This provides new recommendations for advancing optoelectronic devices.

Language: Английский

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Insight Into Designing High‐Performance Polythiophenes for Reduced Urbach Energy and Nonradiative Recombination in Organic Solar Cells

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

Published: April 18, 2024

Abstract In the pursuit of high‐efficiency polythiophene (PT) organic solar cells (OSCs), a critical challenge is reduction nonradiative recombination. This study comprehensively explores polydithienylthiazolothiazole (PTTz)‐based PT terpolymers: PTTz‐Tz and PTTz‐TzT, in which it demonstrate that molecular structure alterations greatly influence aggregation kinetics orientation these polymers. Specifically, PTTz‐TzT achieves rapid ordering during spin coating, effectively suppressing excessive polymer facilitating appropriate phase separation upon mixing with acceptor. Meanwhile, inherently adopts face‐on orientation, resulting more structured π–π stacking vertical direction after acceptor integration, compared to intrinsic edge‐on PTTz‐Tz. These factors collectively contribute lower Urbach energy substantial recombination PTTz‐TzT‐based OSCs, culminating high photovoltaic conversion efficiency (PCE) exceeding 16%. Furthermore, prominent PCE 19.11% obtained by via ternary blend strategy, among highest values reported for OSCs. investigation underscores significance PT‐based polymers, especially regarding recombination, offers novel insights designing high‐performance donors.

Language: Английский

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Passive Photovoltaic Cooling: Advances Toward Low‐Temperature Operation

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(2)

Published: Nov. 27, 2023

Abstract With the great increase in installation, photovoltaics will develop as main power supply source for world shortly. However, actual generation and lifetime of are greatly compromised by high working temperature under outdoor operation. In this review, recent advances four promising passive photovoltaic cooling methods summarized with aim to uncover their principles, performance, application potential devices. For radiative cooling, light management strategies ultraviolet‐photon downshift sub‐bandgap reflection discussed detail reveal reducing enhancing generation. Subsequently, benefits evaporative underlined terms its superior drop Moreover, integrated strategy is further highlighted due electricity production fresh water supply. Most crucially, remaining challenges authors'r insights presented advance commercial applications photovoltaics.

Language: Английский

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Cyanoesterthiophene Based Low‐Cost Polymer Donors for High Efficiency Organic Solar Cells

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(19)

Published: Jan. 11, 2024

Abstract To achieve commercial application of organic solar cells (OSCs), it is necessary to reduce material costs and improve device efficiency. This paper reports on the utilization a multifunctional building block, namely 3‐cyanoesterthiophene, which exhibits simple structure accessibility synthetic for cost‐effective high‐performance polymer donors (PDs). Meanwhile, ternary terpolymerization strategies have been studied. Two similar PDs, PBTCl0‐TCA PBTCl100‐TCA, are synthesized, devices exhibit less‐than‐satisfactory efficiency 13.21% 11.53% due mismatching energy level imperfect morphology. The two PDs with comparable structures commendable compatibility easily form alloy‐like phase in active layer, can effectively boost 14.17% retained high J SC significant improved open‐circuit voltage ( V OC ) fill factor (FF). Encouraged by blending phenomenon, donor (PBTCl50‐TCA) same ratio random designed. And over 17% binary OSCs using demonstrated. synergies incorporation cyanoester‐group terpolymer endow developed deep‐lying levels, face‐on orientation, thermodynamic miscibility prevailing nonfullerene acceptor appropriate crystallinity. findings study provide valuable insights support advancement PDs.

Language: Английский

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How can we improve the stability of organic solar cells from materials design to device engineering?

Aggregate, Journal Year: 2024, Volume and Issue: 5(5)

Published: April 22, 2024

Abstract Among a promising photovoltaic technology for solar energy conversion, organic cells (OSCs) have been paid much attention, of which the power conversion efficiencies (PCEs) rapidly surpassed over 20%, approaching threshold potential applications. However, device stability OSCs including storage stability, photostability and thermal remains to be an enormous challenge when faced with practical The major causes instability are rooted in poor inherent properties light‐harvesting materials, metastable morphology, interfacial reactions highly sensitive external stresses. To get rid these flaws, comprehensive review is provided about recent strategies methods improving from active layers, engineering encapsulation techniques high‐performance OSC devices. In end, prospectives next stage development devices satisfactory long‐term afforded community.

Language: Английский

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Establishing Co‐Continuous Network of Conjugated Polymers and Elastomers for High‐Performance Polymer Solar Cells with Extreme Stretchability

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(26)

Published: May 13, 2024

Abstract High power conversion efficiency (PCE) and mechanical robustness are prerequisites for wearable applications of organic solar cells (OSCs). However, stretchability present active systems (i.e., crack‐onset strain (COS) < 30%) should be improved. While introducing elastomers into is considered a simple method improving stretchability, the inclusion typically results in decrease PCE OSC with limited enhancement due to lack interconnected electrical pathways. In this study, it developed efficient intrinsically stretchable (IS)‐OSCs exceptional robustness, by constructing co‐continuous networks conjugated polymers (D18) (SEBS) within layers. It demonstrated that blend film specific ratio (40:60 w/w) D18:SEBS crucial forming structures, establishing well‐connected channels. Consequently, D18 0.4 :SEBS 0.6 /L8‐BO OSCs achieve 16‐times higher (COS = 126%) than based on D18/L8‐BO 8%), while achieving 4‐times (12.13%) compared SEBS‐rich layers (D18 0.2 0.8 /L8‐BO, 3.15%). Furthermore, ‐based IS‐OSCs preserve 86 90% original PCEs at 50% after 200 stretching/releasing cycles 15% strain, respectively, demonstrating highest among reported IS‐OSCs.

Language: Английский

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