1,5-Diiodocycloctane: a cyclane solvent additive that can extend the exciton diffusion length in thick film organic solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(5), P. 1916 - 1930

Published: Jan. 1, 2024

The addition of cyclane 1,5-diiodocycloctane (DICO) provides critical roles in extending exciton diffusion length within active layer, consequently contributing to the improvement power conversion. efficiency thick film organic solar 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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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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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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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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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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Binary All‐polymer Solar Cells with a Perhalogenated‐Thiophene‐Based Solid Additive Surpass 18 % Efficiency

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(9)

Published: Jan. 3, 2024

Abstract Morphological control of all‐polymer blends is quintessential yet challenging in fabricating high‐performance organic solar cells. Recently, solid additives (SAs) have been approved to be capable tuning the morphology polymer: small‐molecule improving performance and stability devices. Herein, three perhalogenated thiophenes, which are 3,4‐dibromo‐2,5‐diiodothiophene (SA‐T1), 2,5‐dibromo‐3,4‐diiodothiophene (SA‐T2), 2,3‐dibromo‐4,5‐diiodothiophene (SA‐T3), were adopted as SAs optimize cells (APSCs). For blend PM6 PY‐IT, benefitting from intermolecular interactions between thiophenes polymers, molecular packing properties could finely regulated after introducing these SAs. In situ UV/Vis measurement revealed that assist morphological character evolution blend, leading their optimal morphologies. Compared as‐cast device : all SA‐treated binary devices displayed enhanced power conversion efficiencies 17.4–18.3 % with obviously elevated short‐circuit current densities fill factors. To our knowledge, PCE 18.3 for SA‐T1‐treated ranks highest among APSCs date. Meanwhile, universality SA‐T1 other demonstrated unanimously improved performance. This work provide a new pathway realizing APSCs.

Language: Английский

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Molecular Precision Engineering for Efficient Binary Organic Photovoltaics through Energy Level and Fibrillar Structure Modulation

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(33)

Published: May 30, 2024

Abstract Adjusting the energy levels and fibrillar morphology is paramount to enhancing power conversion efficiency (PCE) of organic solar cells (OSCs). In present study, an increase in open‐circuit voltage ( V OC ) facilitated through elongation alkyl chain within AQx (namely AQx‐8), aiming decrease free volume ratio (FVR). This reduction FVR attenuates electron‐phonon coupling, thereby augmenting emission diminishing non‐radiative loss (Δ E nr ). To further refine morphological characteristics, external undecyl AQx‐8 substituted with a shorter carbon cyclohexane noted for its considerable steric hindrance (AQx‐H). alteration significantly mitigates intermolecular aggregation, expands bandgap, elevates lowest unoccupied molecular orbital (LUMO) level, culminating elevated 0.923 devices based on AQx‐H. Morphological analysis reveals that blends AQx‐H exhibit enhanced multi‐length‐scale structure, which conducive exciton dissociation charge transport, contributing high fill factor (FF) nearing 80%. Consequently, this study reports one highest binary PCEs documented, standing at 19.5% (with certification 19.0%).

Language: Английский

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Layer‐by‐Layer Organic Solar Cells Enabled by 1,3,4‐Selenadiazole‐Containing Crystalline Small Molecule with Double‐Fibril Network Morphology

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(21)

Published: March 27, 2024

A double-fibril network of the photoactive layer morphology is recognized as an ideal structure facilitating exciton diffusion and charge carrier transport for high-performance organic solar cells (OSCs). However, in layer-by-layer processed OSCs (LbL-OSCs), polymer donors small molecule acceptors (SMAs) are separately deposited, it challenging to realize a fibril pure SMAs with absence tight interchain entanglement polymers. In this work, crystalline (SMDs), named TDZ-3TR SeDZ-3TR, were designed introduced into L8-BO acceptor solution, forcing phase separation molecular fibrilization. SeDZ-3TR showed higher crystallinity lower miscibility than TDZ-3TR, enabling more driving force favor better fibrilization L8-BO. On other hand, two donor polymers PM6 D18 different widths lengths put together optimize layer. The simultaneously optimization layers resulted impressive power conversion efficiency (PCE) 19.38 % LbL-OSCs.

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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