Impact of Intermolecular Interactions between Halogenated Volatile Solid Additives and the Nonfullerene Acceptor in Organic Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(50)

Published: Sept. 5, 2023

Abstract The halogenated volatile solid additives can delicately optimize the active layer morphology of organic solar cells, improving devices' performance, stability, and reproducibility. However, what type intermolecular interaction occurs between whether truly impacts donor or acceptor remains debatable. Herein, focus is on with conjugated benzene rings their influence composed PM6:Y6 as they evaporated. absorbance spectra exhibit apparent red‐shift features in Y6 absorption regions, while part unaffected. theoretical calculation results reveal that stay two molecules form halogen bonds, affecting π–π aggregation properties Y6. As a result, crystalline are altered, leading to increased charge carrier mobilities, extended diffusion lengths, reduced bimolecular recombination, thus device performance. Especially when 1,3,5‐tri bromobenzene used, champion power conversion efficiency 17.9% attained, among best‐performed cells comprising PM6:Y6. findings shed light experimental guidelines for designing developing highly efficient nonfullerene cells.

Language: Английский

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Solid Additive‐Assisted Selective Optimization Strategy for Sequential Deposited Active Layers to Construct 19.16% Efficiency Binary Organic Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(13)

Published: Dec. 21, 2023

Abstract Volatile solid (VS)‐additives are regarded as an effective tool to manipulate morphology of sequential deposited (SD) active layers for improving power conversion efficiencies (PCEs) organic solar cells (OSCs), while the independent effect VS‐additives on donor and acceptor is often overlooked. Herein, a new VS‐additive named 2‐(2‐methoxyphenyl)benzo[ b ]thiophene (BTO) synthesized applied in SD binary PM6/L8‐BO layers. Introducing it into bottom PM6 layer (PM6 + ), BTO has low volatility longer volatilization distance, which prolongs interaction time between L8‐BO /L8‐BO film, leading over‐aggregated L8‐BO. While inserting top (L8‐BO fast evaporation excellent dipole help enhance molecular absorption, crystallinity, ordered packing system. Therefore, optimized with proper phase separation achieved increase exciton dissociation charge transfer properties, restrain recombination energy loss OSCs, yielding impressive PCE over 19%. Furtherly, using D18 instead PM6, SD‐systems offer record‐high 19.16%. The developed selective optimization strategy provides deep insight working mechanism boosting OSCs.

Language: Английский

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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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Room-temperature-modulated polymorphism of nonfullerene acceptors enables efficient bilayer organic solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(15), P. 5666 - 5678

Published: Jan. 1, 2024

Polymorphism of nonfullerene acceptors enhances electron transport properties and potentially impacts the performance organic electronic devices.

Language: Английский

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Vertical Phase Regulation with 1,3,5‐Tribromobenzene Leads to 18.5% Efficiency Binary Organic Solar Cells

Advanced Science, Journal Year: 2023, Volume and Issue: 10(26)

Published: July 9, 2023

The sequential deposition method assists the vertical phase distribution in photoactive layer of organic solar cells, enhancing power conversion efficiencies. With this film coating approach, morphology both layers can be fine-tuned with high boiling solvent additives, as frequently applied one-step casting films. However, introducing liquid additives compromise morphological stability devices due to residuals. Herein, 1,3,5-tribromobenzene (TBB) volatility and low cost, is used a solid additive acceptor solution combined thermal annealing regulate cells composed D18-Cl/L8-BO. Compared control treated TBB those that underwent additional processing exhibit increased exciton generation rate, charge carrier mobility, lifetime, reduced bimolecular recombination. As result, TBB-treated achieve champion efficiency 18.5% (18.1% averaged), one highest efficiencies binary open circuit voltage exceeding 900 mV. This study ascribes advanced device performance gradient-distributed donor-acceptor concentrations direction. findings provide guidelines for optimizing sequentially deposited top high-performance cells.

Language: Английский

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Bicontinuous donor and acceptor fibril networks enable 19.2% efficiency pseudo‐bulk heterojunction organic solar cells

Interdisciplinary materials, Journal Year: 2023, Volume and Issue: 2(6), P. 866 - 875

Published: Nov. 1, 2023

Abstract Realizing bicontinuous fibrillar charge transport networks in the photoactive layer has been considered a promising method to achieve high‐efficiency organic solar cells (OSCs); however, this rarely achieved due interference of molecular organization donor and acceptor components during solution casting. In contribution, fibrillization polymer PM6 small nonfullerene L8‐BO is realized with assistance conjugated D18‐Cl. Atomic force microscopy photo‐induced reveal that D18‐Cl co‐assemble into long slender fibrils within wide blending ratios their high compatibility; contrast, can be encouraged incorporation 1% By utilizing pseudo‐bulk heterojunction (p‐BHJ) active fabricated by layer‐by‐layer deposition, optimized PM6+20% D18‐Cl/L8‐BO+1% OSCs obtain fibril networks, leading enhanced exciton dissociation processes superior power conversion efficiency 19.2% (certified 18.91%) compared 18.8% PM6:D18‐Cl:L8‐BO ternary BHJ OSCs.

Language: Английский

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18.9% Efficiency Binary Organic Solar Cells Enabled by Regulating the Intrinsic Properties of PEDOT:PSS

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(7)

Published: Nov. 1, 2023

Abstract Anode interlayers play critical roles in organic solar cells, impacting the electrode's work function, energy level alignment, hole extraction, and electrode surfaces. However, development of commonly used anode interlayer PEDOT:PSS lags behind rapid cells due to its low conductivity, acidity, poor electron‐blocking capabilities. Herein, an innovative strategy is proposed regulate intrinsic properties by incorporating molybdenum‐containing semiconductors (MoO 3 , MoS 2 ), which validated using state‐of‐the‐art active layer consisting PM6:Y6 conventional devices. The addition alters aggregation morphology layer, increasing conductivity reducing acidity. Furthermore, extraction ability are improved changing function with influence deep forming a trap capture electrons. Consequently, when employed, champion power conversion efficiency 17.1% devices 18.9% composed PM6:L8‐BO achieved. results, enhance semiconductors, offer valuable guidelines for engineering fabricate highly efficient non‐fullerene cells.

Language: Английский

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18.63% Efficiency of Ternary Organic Solar Cells Achieved via Nonhalogenated Solvent and Hot Spin‐Coating Process

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(27)

Published: March 5, 2024

Abstract The solubility problem of conjugated polymers in nonhalogenated solvents limits the application Organic solar cells (OSCs). By combining with a hot spin‐coating process, efficient PM6:BTP‐BO‐4F:GS‐ISO ternary OSCs are prepared by employing o‐xylene as solvent. After adding 10 wt% content GS‐ISO to PM6:BTP‐BO‐4F, surface morphology active layers is improved and charge extraction, transport, collection enhanced. Compared efficiency PM6:BTP‐BO‐4F (16.25%), an 18.63% achieved for OSCs. Moreover, 14.13% air. work provides new strategy preparing environmentally friendly using green solvents.

Language: Английский

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Recent development in solid additives enables high-performance organic solar cells

EnergyChem, Journal Year: 2024, Volume and Issue: 6(4), P. 100129 - 100129

Published: June 15, 2024

Language: Английский

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Effective N‐Doping of Non‐Fullerene Acceptor via Sequential Deposition Enables High‐Efficiency Organic Solar Cells

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(24)

Published: April 1, 2024

Abstract Charge transport in the active layer, which can be effectively modulated by molecular doping of organic semiconductors, significantly affects photovoltaic performance solar cells (OSCs). However, it is difficult to control dopant distribution bulk heterojunction (BHJ) films, hinders efficient OSCs. Herein, an effective n‐doping strategy developed via sequential deposition (SD) D18 donor and doped acceptor. The favorable vertical component SD films helps optimize carrier pathways. method confines n‐dopant N‐DMBI acceptor allowing positive effects doping. Consequently, device exhibits superior charge with suppressed recombination, lower trap density, enhanced extraction compared undoped one, resulting a high power conversion efficiency 19.55% for D18/L8‐BO binary In addition, does not affect thermal stability devices, retaining over 90% its initial after 1200 h heating at 80 °C. universality also verified other non‐fullerene systems. These results demonstrate great potential building high‐performance OSCs transport.

Language: Английский

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