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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Over 18.8% Efficiency of Layer‐By‐Layer Organic Photovoltaics Enabled by Ameliorating Exciton Utilization in Acceptor Layer

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(16)

Published: Jan. 2, 2024

Abstract The layer‐by‐layer (LbL) organic photovoltaics (OPVs) are constructed with wide‐bandgap donor PM1 and narrow‐bandgap acceptor L8‐BO. exciton utilization near cathode is still challenging considering restricted diffusion distance of excitons inability for transferring energy from L8‐BO to PM1. Herein, incorporation into layer (DIA) strategy employed improve cathode. efficiency LbL OPVs can be improved 18.02% 18.81% by incorporating 10 wt% layer, which closely associated efficient separation originated more adequate donor/acceptor interface faster charge transfer, as evidenced magneto‐photocurrent transient absorption results. in situ test morphological characterization clarify that molecular packing property benefited prolonged aggregation nucleation time assisted DIA strategy, contributing transport inhibited recombination active layers. thickness insensitive also induced indicated PCE retention value (82.2% vs. 74.0%) PM1/L8‐BO:PM1 PM1/L8‐BO when increased ≈180 nm. This work demonstrates the effectiveness improving tolerance OPVs.

Language: Английский

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Impact of Electrostatic Interaction on Vertical Morphology and Energy Loss in Efficient Pseudo‐Planar Heterojunction Organic Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)

Published: Jan. 27, 2024

Abstract Although a suitable vertical phase separation (VPS) morphology is essential for improving charge transport efficiency, reducing recombination, and ultimately boosting the efficiency of organic solar cells (OSCs), there lack theoretical guidance on how to achieve ideal morphology. Herein, relationship between molecular structure VPS pseudo‐planar heterojunction (PPHJ) OSCs established by using surface electrostatic potential (ESP) as bridge. The morphological evolution mechanism revealed studying four binary systems with vary difference (∆ESP) donors (Ds) acceptors (As). findings manifest that ∆ESP increases, active layer more likely form well‐mixed phase, while smaller favors Interestingly, it also observed larger leads enhanced miscibility Ds As, resulting in higher non‐radiative energy losses (ΔE 3 ). Based these discoveries, ternary PPHJ device meticulously designed an appropriate obtain better lower ΔE , impressive 19.09% achieved. This work demonstrates optimizing ΔESP, not only formation can be controlled, but reduced, paving way further boost OSC performance.

Language: Английский

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Over 19.2% efficiency of layer-by-layer organic photovoltaics enabled by a highly crystalline material as an energy donor and nucleating agent

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(14), P. 5173 - 5182

Published: Jan. 1, 2024

By introducing highly crystalline material D18A into donor layer acting as energy and nucleating agent, an optimal PCE of 19.25% was achieved for PM1 : D18A/L8-BO based OPVs.

Language: Английский

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Eco-friendly solvent-processed layer-by-layer ternary all-polymer solar cells exhibiting over 18.5% efficiency

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 493, P. 152558 - 152558

Published: May 25, 2024

Language: Английский

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Sequentially Processed Bulk‐Heterojunction‐Buried Structure for Efficient Organic Solar Cells with 500 nm Thickness

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(25)

Published: March 13, 2024

Abstract Large‐area printing fabrication is a distinctive feature of organic solar cells (OSCs). However, the advance upscalable challenged by thickness active layers considering importance both exciton dissociation and charge collection. In this work, bulk‐heterojunction‐buried (buried‐BHJ) structure introduced sequential deposition to realize efficient collection, thereby contributing OSCs with 500 nm thick layers. The buried‐BHJ distributes donor acceptor phases in vertical direction as transport channels, while numerous BHJ interfaces are buried each phase facilitate simultaneously. It found that configurations possess rapid transport, resulting reduced recombination losses. comparison traditional structures, displays decent tolerance film thickness. particular, power conversion efficiency 16.0% achieved at nm. To best authors’ knowledge, represents champion OSCs.

Language: Английский

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An Efficient and Stable Inverted Structure Organic Solar Cell Using ZnO Modified by 2D ZrSe₂ as a Composite Electron Transport Layer

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(37)

Published: April 10, 2024

Abstract As an electron transport layer (ETL) widely used in organic solar cells (OSCs), ZnO has problems with energy level mismatch the active and excessive defects on surface, which can reduce efficiency of OSCs. Here, ZnO/ZrSe 2 composite is fabricated by modifying 2D ZrSe . The XPS first‐principles calculation (FPC) show that obtains electrons from forms interfacial dipoles toward layer, decreases work function ZnO, thus reducing interface barrier favoring collection At same time, after modification, oxygen vacancy density surface decreases, improving conductivity ZnO. More importantly, femtosecond transient absorption (Fs‐TA) shows selectively traps holes prevents entering thereby probability recombination. Finally, as a novel ETL OSCs PBDB‐T: ITIC, PM6:Y6 PM6: L8‐BO layers, obtaining 12.09%, 16.34%, 18.24% efficiency, respectively. This study provides method for modification further investigates role nanosheets modification.

Language: Английский

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Optimizing Phase Separation and Vertical Distribution via Molecular Design and Ternary Strategy for Organic Solar Cells with 19.5% Efficiency

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(5), P. 2420 - 2427

Published: April 28, 2024

Achieving finely tuned phase separation and vertical distribution within the photoactive layer is crucial for enhancing charge transport, thereby significantly influencing photovoltaic performance of organic solar cells (OSCs). In this study, a nonfullerene acceptor, denoted as HLG, designed synthesized by introducing hydrophobic 1,2,4,5-tetrafluoro-3-((2-ethylhexyl)oxy)benzene side chains. The fluorine-substituted functional groups endow HLG with higher surface energy, rendering it suitable utilization morphological regulator in PB2:BTP-eC9 blends. morphology study reveals that plays an important role formation favorable distribution. Benefiting from desirable morphology, PB2:HLG:BTP-eC9-based OSC demonstrates impressive power conversion efficiency (PCE) 19.5%. This introduces effective approach combines molecular design ternary strategy to optimize active simultaneously, leading significant improvements PCE OSCs.

Language: Английский

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Non-fullerene acceptors with high crystallinity and photoluminescence quantum yield enable >20% efficiency organic solar cells

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

Published: Jan. 29, 2025

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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