Tunable Donor Aggregation Dominance in a Ternary Matrix of All‐Polymer Blends with Improved Efficiency and Stability

Advanced Materials, Год журнала: 2023, Номер 36(15)

Опубликована: Июль 7, 2023

Abstract Using two structurally similar polymer acceptors in constructing high‐efficiency ternary all‐polymer solar cells is a widely acknowledged strategy; however, the focus thus far has not been on how acceptor(s) would tune aggregation of donors, and furthermore film morphology device performance (efficiency stability). Herein, it reported that matching celebrity acceptor PY‐IT donor PBQx‐TCl results enhanced H ‐ PBQx‐TCl, which can be finely tuned by controlling amount second PY‐IV. Consequently, efficiency‐optimized PY‐IV weight ratio (0.2/1.2) leads to state‐of‐the‐art power conversion efficiency 18.81%, wherein light‐illuminated operational stability also along with well‐protected thermal stability. Such enhancements stabilities attributed optimization desired glass transition temperature target active layer based comprehensive characterization. In addition being high‐power case for cells, these are successful attempt using combined toward optimal morphology, provides theoretical basis construction other types organic photovoltaics beyond cells.

Язык: Английский

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

Energy & Environmental Science, Год журнала: 2024, Номер 17(5), С. 1916 - 1930

Опубликована: Янв. 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.

Язык: 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, Год журнала: 2024, Номер 36(33)

Опубликована: Июнь 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.

Язык: Английский

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Efficient Dual Mechanisms Boost the Efficiency of Ternary Solar Cells with Two Compatible Polymer Donors to Exceed 19%

Advanced Materials, Год журнала: 2024, Номер 36(21)

Опубликована: Фев. 9, 2024

Abstract Ternary strategyopens a simple avenue to improve the power conversion efficiency (PCE) of organic solar cells (OSCs). The introduction wide bandgap polymer donors (PDs) as third component canbetter utilize sunlight and mechanical thermal stability active layer. However, efficient ternary OSCs (TOSCs) with two PDs are rarely reported due inferior compatibility shortage match acceptors. Herein, PDs‐(PBB‐F PBB‐Cl) adopted in dual‐PDs systems explore underlying mechanisms their photovoltaic performance. findings demonstrate that components exhibit excellent miscibility PM6 embedded host donor form alloy‐like phase. A more profound mechanism for enhancing through dual mechanisms, guest energy transfer charge transport at donor/acceptor interface, has been proposed. Consequently, PM6:PBB‐Cl:BTP‐eC9 TOSCs achieve PCE over 19%. Furthermore, better than binary reduction spatial site resistance resulting from tightly entangled long‐chain structure. This work not only provides an effective approach fabricate high‐performance TOSCs, but also demonstrates importance developing compatible PD materials.

Язык: Английский

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

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Март 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.

Язык: Английский

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A Pseudo Planar Heterojunction Structure for Eco‐Friendly Printable Organic Solar Cells Achieving 19.05% Efficiency

Advanced Functional Materials, Год журнала: 2024, Номер 34(38)

Опубликована: Апрель 27, 2024

Abstract Obtaining a well‐accurate vertical distribution active layer morphology through the air‐printing process is an essential task for achieving efficient scalable large‐area organic solar cells (OSCs). In this target, desired and controllable pseudo planar heterojunction (PPHJ) structure with suitable phase separation developed by pre‐deposited D18‐Cl under PM6:BTP‐eC9 film via eco‐friendly manufacturing method. The addition of regulates molecular crystallization leads to ideal stratification while simultaneously suppressing voltage loss, optimizing energetic disorder, carrier management. Impressively, optimal PPHJ devices perform superior power conversion efficiencies (PCEs) 19.05% (100 nm), 17.33% (300 14.14% (4 cm 2 ) compared BHJ devices. Importantly, OSCs also exhibit impressive extrapolated T 80 (the time required reach 80% initial PCE) long‐time storage operational stability, as well thermal stability.

Язык: Английский

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High-Efficiency Ternary Polymer Solar Cells with a Gradient-Blended Structure Fabricated by Sequential Deposition

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(12), С. 15121 - 15132

Опубликована: Март 19, 2024

Acquiring the ideal blend morphology of active layer to optimize charge separation and collection is a constant goal polymer solar cells (PSCs). In this paper, ternary strategy sequential deposition process were combined make sufficient use spectrum, energy-level structure, regulate vertical phase morphology, ultimately enhance power conversion efficiency (PCE) stability PSCs. Specifically, donor acceptor illustrated gradient-blended distribution in deposition-processed films, thus resulting facilitated carrier characteristics devices. Consequently, PSCs based on D18-Cl/Y6:ZY-4Cl have achieved device over 18% with synergetic improvement open-circuit voltage (VOC), short-circuit current density (JSC), fill factor (FF). Therefore, work reveals facile approach fabricating improved performance stability.

Язык: Английский

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Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

Energy & Environmental Science, Год журнала: 2024, Номер 17(14), С. 4944 - 4967

Опубликована: Янв. 1, 2024

Quinoxaline-based nonfullerene acceptors show highly tunable photoelectric properties and superior performance for sunlight utilization enabled by their powerful core-functionalization ability.

Язык: Английский

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Ionic Bonding Without Directionality Facilitates Efficient Interfacial Bridging for Perovskite Solar Cells

Small, Год журнала: 2024, Номер 20(28)

Опубликована: Фев. 11, 2024

Abstract Interface passivation through Lewis acid–base coordinate chemistry in perovskite solar cells (PSCs) is a universal strategy to reduce interface defects and hinder ion migration. However, the formation of covalent bonding demands strict directional alignment coordinating atoms. Undoubtedly, this limits selected range molecules, because successful molecular bridge between charge transport layer bottom needs well‐placed orientation. In study, it discovered that potassium ions can migrate hollow sites multiple iodine from form K‐I x ionic bonding, bonds without directionality support backbone rotation facilitate polar (carboxyl groups) chelating Pb at interface, finally forming closed‐loop structure. The synergy significantly reduces defects, changes electric field distribution, immobilizes resulting eliminating hysteresis effect enhancing performance PSCs. As result, corresponding devices achieve high efficiency exceeding 24.5% (0.09 cm 2 ), mini‐module with 21% (12.4 ). These findings provide guidelines for designing bridging strategies buried

Язык: Английский

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Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(25)

Опубликована: Апрель 16, 2024

Ternary organic solar cells (T-OSCs) represent an efficient strategy for enhancing the performance of OSCs. Presently, majority high-performance T-OSCs incorporates well-established Y-acceptors or donor polymers as third component. In this study, a novel class conjugated small molecules has been introduced component, demonstrating exceptional photovoltaic in T-OSCs. This innovative molecule comprises ethylenedioxythiophene (EDOT) bridge and 3-ethylrhodanine end group, with EDOT unit facilitating creation multiple conformation locks. Consequently, EDOT-based exhibits two-dimensional charge transport, distinguishing it from thiophene-bridged molecule, which displays fewer locks provides one-dimensional transport. Furthermore, robust electron-donating nature imparts cascade energy levels relative to electron acceptor. As result, OSCs incorporating component demonstrate enhanced mobilities, yielding remarkable efficiency 19.3 %, surpassing 18.7 % observed thiophene-based The investigations study underscore excellence building block constructing materials high carrier thereby contributing elevated

Язык: Английский

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