Halogenation Strategy of Thiophene Derived Solvent Additives Enables Optimized Morphology for Organic Solar Cells with 19.17% Efficiency

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

Published: Jan. 14, 2024

Abstract As simple and versatile tools, additives have been widely used to refine active layer morphology played a crucial role in boosting the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, three novel solvent named Th‐FSi, Th‐ClSi, Th‐BrSi with same backbone 2,5‐bis(trimethylsilyl)thiophene are designed synthesized by substituting different halogens fluorine, chlorine, bromine, respectively. Notably, Th‐ClSi exhibits more significant dipole moment engages non‐covalent interactions small‐molecule acceptor (SMA) L8‐BO, which slight adjustments intermolecular interaction, crystallinity, molecular packing PM6:L8‐BO layer. Consequently, OSCs incorporating outperform their Th‐FSi counterparts photo‐capturing, reduced energy loss, superior exciton dissociation, charge transfer properties, out‐coming yields an enhanced PCE 18.29%. Moreover, integrating near‐infrared absorbing SMA (BTP‐eC9) guest into matrix, absorption spectrum span 880–930 nm, resultant ternary achieve commendable 19.17%, ranking among highest efficiencies reported date is expanded. These findings underscore promise halogenated thiophene‐based as potent avenue for morphological fine‐tuning consequent enhancement OSCs.

Language: Английский

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Optimizing Double‐Fibril Network Morphology via Solid Additive Strategy Enables Binary All‐Polymer Solar Cells with 19.50% Efficiency

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

Published: July 16, 2024

Double-fibril network morphology (DFNM), in which the donor and acceptor can self-assemble into a double-fibril structure, is beneficial for exciton dissociation charge transport organic solar cells. Herein, it demonstrated that such DFNM be constructed optimized all-polymer cells (all-PSCs) with assistance of 2-alkoxynaphthalene volatile solid additives. It revealed incorporation induce stepwise regulation aggregation molecules during film casting thermal annealing processes. Through altering alkoxy additives, both intermolecular interactions molecular miscibility host materials precisely tuned, allows optimization process facilitation self-assembly, thus leading to reinforced packing DFNM. As result, an unprecedented efficiency 19.50% (certified as 19.1%) obtained 2-ethoxynaphthalene-processed PM6:PY-DT-X all-PSCs excellent photostability (T

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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Defining Solid Additive's Pivotal Role on Morphology Regulation in Organic Solar Cells Produced by Layer‐by‐layer Deposition

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(22)

Published: March 8, 2024

Abstract Herein, two emerging device optimization methods, solid additive and layer‐by‐layer (LBL) process, for organic solar cells (OSCs) are simultaneously studied. Through traditional blend cast recently proposed identical solvent LBL cast, BDCB (2‐monobromo‐1,3‐dichloro‐bezene), a benzene derivative, is used to improve the performance based on celebrity combination PM6:L8‐BO. The results reveal that finely optimized concentration in PM6 solution can push efficiency of 19.03% compared with only 18.12% while power conversion (PCE) changing trend determined by BDCB's ratio L8‐BO's precursor. morphology characterizations confirm there exists no significant stratification LBL‐processed devices, supported previously reported swelling‐intercalation‐phase separation (SIPS) model. Thereby, additive's 2D considered smart strategy tuning SIPS which various final states. This work not reports cutting‐edge binary OSCs, but also new insight deep understanding method‐based development.

Language: Английский

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Highly efficient organic solar cells enabled by suppressing triplet exciton formation and non-radiative recombination

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Oct. 15, 2024

The high non-radiative energy loss is a bottleneck issue that impedes the improvement of organic solar cells. formation triplet exciton thought to be main source large loss. Decreasing rate back charge transfer considered as an effective approach alleviate relaxation charge-transfer state and generation. Herein, we develops efficient ternary system based on D18:N3-BO:F-BTA3 by regulating disorder blend. With addition F-BTA3, well-defined morphology with more condensed molecular packing obtained. Moreover, reduced demonstrated in blend, which decreases well formation, therefore hinders recombination pathways. Consequently, D18:N3-BO:F-BTA3-based device produces low 0.183 eV record-high efficiency 20.25%. This work not only points towards significant role suppression loss, but also provides valuable insight for enhancing performance OSCs. Here, authors regulate through system, achieving

Language: Английский

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Low‐Volatility Fused‐Ring Solid Additive Engineering for Synergistically Elongating Exciton Lifetime and Mitigating Trap Density Toward Organic Solar Cells of 20.5% Efficiency

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

Published: Feb. 12, 2025

Abstract Volatile solid additives (VSAs) with single or fused‐ring structures have attracted much attention for enhancing power conversion efficiencies (PCEs) of organic solar cells (OSCs). While the working mechanisms high‐volatility single‐ring been well studied, influence low‐volatility VSAs on molecular aggregations and exciton/carrier dynamics remains still unclear. Herein, 3,6‐dibromothieno[3,2‐b]thiophene (3,6TTBr) is selected as a representative VSA to elucidate its mechanism. Via theoretical experimental joint investigation, it found that rigid planar 3,6TTBr molecules adsorb onto terminal units L8‐BO (acceptor), inducing loose space adjacent molecules. The thus favors center‐terminal packing larger interfragment distance, which relieves over‐aggregation induces ordered packing. Consequently, treatment reduces aggregation‐caused quenching, photoluminescence quantum yield exciton lifetime film. combination above properties reduced trap density improved carrier transport in 3,6TTBr‐treated devices contributed PCE 20.1%. To validate broad applicability findings, 1,5‐dibromonaphthalene (1,5‐BN), another solid, explored. 1,5‐BN achieved an impressive 20.5%, verifying validity strategy boosting OSC performances.

Language: Английский

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3D Crystal Framework Regulation Enables Se‐Functionalized Small Molecule Acceptors Achieve Over 19% Efficiency

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(19)

Published: March 10, 2024

Abstract Se‐functionalized small molecule acceptors (SMAs) exhibit unique advantages in constructing materials with near‐infrared absorption, but their photovoltaic performance lags behind that of S‐containing analogs organic solar cells (OSCs). Herein, two new Se‐containing SMAs, namely Se‐EH and Se‐EHp, are designed synthesized by regulating bifurcation site outer alkyl chain, which enables Se‐EHp to form different 3D crystal frameworks from CH1007. displays tighter π–π stacking denser packing framework smaller‐sized pore structure induced larger steric hindrance effect chain branched at 2‐position, a higher dielectric constant PM6:Se‐EH active layer can be obtained. OSCs based on achieved very high PCEs 18.58% binary 19.03% ternary devices FF approaching 80% for SMAs. A more significant adjusts the molecular crystallization favorable nanofiber interpenetrating network an appropriate domain size reduce rate sub‐ns recombination promote balanced transport carriers. This work provides references further design development highly efficient

Language: Английский

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High Performance as‐cast Organic Solar Cells Enabled by a Refined Double‐fibril Network Morphology and Improved Dielectric Constant of Active Layer

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: April 24, 2024

Abstract High performance organic solar cells (OSCs) are usually realized by using post‐treatment and/or additive, which can induce the formation of metastable morphology, leading to unfavorable device stability. In terms industrial production, development high efficiency as‐cast OSCs is crucially important, but it remains a great challenge obtain appropriate active layer morphology and power conversion (PCE). Here, efficient constructed via introducing new polymer acceptor PY‐TPT with dielectric constant into D18:L8‐BO blend form double‐fibril network morphology. Besides, incorporation enables an enhanced lower exciton binding energy layer. Therefore, dissociation charge transport in D18:L8‐BO:PY‐TPT‐based device, affording record‐high PCE 18.60% excellent photostability absence post‐treatment. Moreover, green solvent‐processed devices, thick‐film (300 nm) module (16.60 cm 2 ) fabricated, show PCEs 17.45%, 17.54%, 13.84%, respectively. This work brings insight construction pushing forward practical application OSCs.

Language: Английский

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A Novel Upside‐Down Thermal Annealing Method Toward High‐Quality Active Layers Enables Organic Solar Cells with Efficiency Approaching 20%

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(47)

Published: Oct. 9, 2024

Abstract The emerging non‐fullerene acceptors with low voltage losses have pushed the power conversion efficiency of organic solar cells (OSCs) to ≈20% auxiliary morphology optimization. Thermal annealing (TA), as most widely adopted post‐treatment method, has been playing an essential role in realizing potential various material systems. However, procedure TA, i.e., way that TA is performed, almost identical among thousands OSC papers since ≈30 years ago other than changes temperature and time. Herein, a reverse thermal (RTA) technique developed, which can enhance dielectric constant active layer film, thereby producing smaller Coulomb capture radius (14.93 nm), meanwhile, forming moderate nano‐scale phase aggregation more favorable face‐on molecular stacking orientation. Thus, this method reduce decline open circuit conventional by achieving decreased radiative (0.334 eV) non‐radiative (0.215 recombination loss. RTA PM6:L8‐BO‐X device increases 19.91% (certified 19.42%) compared (18.98%). It shown exhibits superb universality 4 systems, revealing its dramatic be employed wide range OSCs.

Language: Английский

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In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells

National Science Review, Journal Year: 2024, Volume and Issue: 11(12)

Published: Nov. 4, 2024

ABSTRACT Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells (all-PSCs), a promising photovoltaic technology towards multi-scenario application. Although the nano-fibrillar network of active layer induced by treatment is confirmed as key factor power conversion efficiency (PCE) all-PSCs, its formation mechanism not clearly revealed, lack precise and convincing real-time observation crystallization phase separation during liquid-to-solid transition process spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering (GIWAXS/GISAXS) screening that reveals fact naphthalene derived solid additives can suppress aggregation polymer acceptor (PY-IT) at beginning stage spin coating, which provides sufficient time space donor (PM6) to form fibril structure. Moreover, guided this knowledge, ternary system proposed, achieves cutting-edge level PCEs both small-area (0.04 cm2) (also decent operational stability) large-area (1 devices.

Language: Английский

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