Embedded Host/Guest Alloy Aggregations Enable High‐Performance Ternary Organic Photovoltaics

Advanced Materials, Год журнала: 2023, Номер 35(51)

Опубликована: Июль 31, 2023

The ternary strategy has been intensively studied to improve the power conversion efficiencies of organic photovoltaics. Thereinto, location guest component plays a critical role, but few reports have devoted this concern. Hereon, distribution LA1 as acceptor in variety scenarios is reported and dominating driving forces managing operating modes are outlined. Governed by appropriate relationship compatibility, crystallinity, surface energies between host acceptors, well interfacial interactions donor dual most molecules permeate into internal phases, forming embedded host/guest alloy-like aggregations. characteristic distributions greatly optimize morphologies, maximize energy transfer, enhance exciton/charge behaviors. Particularly, PM6:IT-4F:LA1 cells afford high efficiency 15.27% with impressive fill factors (FF) over 81%. popularization studies further verify superiority LA1-involved alloy structures, Y6-family component, an outstanding 19.17% received. results highlight importance systems shed light on governing distributing guests cells.

Язык: Английский

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Self‐Assembled Molecules with Asymmetric Backbone for Highly Stable Binary Organic Solar Cells with 19.7 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(18)

Опубликована: Март 9, 2024

The hole-transporting material (HTM), poly (3,4-ethylene dioxythiophene) poly(styrene sulfonate) (PEDOT : PSS), is the most widely used in realization of high-efficiency organic solar cells (OSCs). However, stability PEDOT PSS-based OSCs quite poor, arising from its strong acidity and hygroscopicity. In addition, PSS has an absorption infrared region high highest occupied molecular orbital (HOMO) energy level, thus limiting enhancement short-circuit current density (J

Язык: Английский

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Efficient all-small-molecule organic solar cells processed with non-halogen solvent

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 2, 2024

Abstract All-small-molecule organic solar cells with good batch-to-batch reproducibility combined non-halogen solvent processing show great potential for commercialization. However, of all-small-molecule are rarely reported and its power conversion efficiencies very difficult to improve. Herein, we designed synthesized a small molecule donor BM-ClEH that can take advantage strong aggregation property induced by intramolecular chlorine-sulfur non-covalent interaction improve molecular pre-aggregation in tetrahydrofuran corresponding micromorphology after film formation. Tetrahydrofuran-fabricated based on BM-ClEH:BO-4Cl achieved high 15.0% binary device 16.1% ternary under thermal annealing treatment. In contrast, weakly aggregated BM-HEH without bond is almost inefficient same conditions due poor disordered π-π stacking, indistinct phase separation exciton dissociation. This work promotes the development provides further guidance.

Язык: Английский

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Designing a Novel Wide Bandgap Small Molecule Guest for Enhanced Stability and Morphology Mediation in Ternary Organic Solar Cells with over 19.3% Efficiency

Advanced Science, Год журнала: 2024, Номер 11(23)

Опубликована: Апрель 3, 2024

Abstract In this study, a novel wide‐bandgap small molecule guest material, ITOA, designed and synthesized for fabricating efficient ternary organic solar cells (OSCs) ITOA complements the absorbance of PM6:Y6 binary system, exhibiting strong crystallinity modest miscibility. optimizes morphology by promoting intensive molecular packing, reducing domain size, establishing preferred vertical phase distribution. These features contribute to improved well‐balanced charge transport, suppressed carrier recombination, exciton dissociation. Consequently, significantly enhanced efficiency 18.62% device is achieved, accompanied increased short‐circuit current density ( J SC ), fill factor (FF), open‐circuit voltage V OC ). Building on success, replacing Y6 with BTP‐eC9 leads an outstanding PCE 19.33% OSCs. Notably, introduction expedites formation optimized morphology, resulting in impressive 18.04% without any postprocessing. Moreover, exhibits operational stability under maximum power point (MPP) tracking. This comprehensive study demonstrates that rationally can optimize reduce energy loss, streamline fabrication process, essential achieving high OSCs, paving way practical commercial applications.

Язык: Английский

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Optical and electrical losses in semitransparent organic photovoltaics

Joule, Год журнала: 2024, Номер 8(2), С. 527 - 541

Опубликована: Янв. 9, 2024

Язык: Английский

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Polymer Fiber Rigid Network with High Glass Transition Temperature Reinforces Stability of Organic Photovoltaics

Nano-Micro Letters, Год журнала: 2024, Номер 16(1)

Опубликована: Июнь 18, 2024

Organic photovoltaics (OPVs) need to overcome limitations such as insufficient thermal stability be commercialized. The reported approaches improve either rely on the development of new materials or tailoring donor/acceptor morphology, however, exhibiting limited applicability. Therefore, it is timely develop an easy method enhance without having donor-acceptor compatibilizers, by introducing another third component. Herein, a unique approach presented, based constructing polymer fiber rigid network with high glass transition temperature (T

Язык: Английский

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Strengthening Near‐Infrared Photon Harvesting in Semi‐Transparent All‐Polymer Solar Cells through the Synergy of Fluorination on the Selenide Monomer Backbone

Advanced Functional Materials, Год журнала: 2024, Номер 34(33)

Опубликована: Апрель 26, 2024

Abstract All‐polymer solar cells (all‐PSCs) offer promising potential for large‐scale manufacturing due to their remarkable mechanical and thermal stability. However, the limited capacity of polymer acceptors near‐infrared (NIR) photon harvesting has impeded progress in semi‐transparent (ST) all‐PSCs. Here, study develops a pair new NIR acceptors, named PYSeF‐T PYSe2F‐T, with mono‐/di‐fluorinated end groups capped selenide monomer backbone, respectively. Owing stronger intermolecular interaction intramolecular charge transfer effect di‐fluorinated PYSe2F‐T exhibits crystallinity more bathochromic absorption 1000 nm. When blended donor, PM6, PY2SeF‐T‐based all‐PSC demonstrates higher efficiency 16.73% short‐circuit current ( J SC ) 27.7 mA cm −2 , which is highest Based on these, ST device based PM6:PYSe2F‐T superior 12.52% an average visible transmittance 26.2% light utilization 3.28%, outperforming mono‐fluorinated counterpart. The work provides in‐depth understanding above synergistic effects develop establishes solid foundation future investigations into large‐area flexible

Язык: Английский

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Exploring the Impact of Structural Modifications of Phenothiazine-Based Novel Compounds for Organic Solar Cells: DFT Investigations

Polymers, Год журнала: 2025, Номер 17(1), С. 115 - 115

Опубликована: Янв. 5, 2025

This paper explores a novel group of D-π-A configurations that has been specifically created for organic solar cell applications. In these material compounds, the phenothiazine, furan, and two derivatives thienyl-fused IC act as donor, π-conjugated spacer, end-group acceptors, respectively. We assess impact substituents by introducing bromine atoms at potential substitution sites on each acceptor (EG1 EG2). With donor π-bridge held constant, we have employed density functional theory time-dependent DFT simulations to explore photophysical optoelectronic properties tailored compounds (M1–M6). demonstrated how structural modifications influence materials cells. Moreover, all proposed exhibit greater Voc exceeding 1.5 V, suitable HOMO-LUMO energy gap (2.14–2.30 eV), higher dipole moments (9.23–10.90 D). Various decisive key factors are crucial exploring compounds—frontier molecular orbitals, transition matrix, electrostatic potential, open-circuit voltage, maximum absorption, reduced gradient, charge transfer length (Dindex)—were also explored. Our analysis delivers profound insights into design principles optimizing performance applications based halogenated compounds.

Язык: Английский

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Delayed Crystallization Kinetics Allowing High‐Efficiency All‐Polymer Photovoltaics with Superior Upscaled Manufacturing

Advanced Materials, Год журнала: 2023, Номер 36(3)

Опубликована: Сен. 22, 2023

Though encouraging performance is achieved in small-area organic photovoltaics (OPVs), reducing efficiency loss when evoluted to large-area modules an important but unsolved issue. Considering that polymer materials show benefits film-forming processability and mechanical robustness, a high-efficiency all-polymer OPV module demonstrated this work. First, ternary blend consisting of two donors, PM6 PBQx-TCl, one acceptor, PY-IT, developed, with which triplet state recombination suppressed for reduced energy loss, thus allowing higher voltage; donor-acceptor miscibility compromised enhanced charge transport, resulting improved photocurrent fill factor; all these contribute champion 19% OPVs. Second, the delayed crystallization kinetics from solution film solidification gives longer operation time window optimized morphology module, relieving factor record 16.26% on upscaled area 19.3 cm

Язык: Английский

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Recent Progress in Materials and Device Design for Semitransparent Photovoltaic Technologies

Advanced Energy Materials, Год журнала: 2023, Номер 13(39)

Опубликована: Сен. 5, 2023

Abstract Semitransparent photovoltaic (STPV) solar cells offer an immense opportunity to expand the scope of photovoltaics special applications such as windows, facades, skylights, and so on. These new opportunities have encouraged researchers develop STPVs using traditional thin‐film cell technologies (amorphous‐Si, CdTe, CIGS or emerging (organic, perovskites, dye‐sensitized). There are considerable improvements in both power conversion efficiency (PCE) semitransparency these STPV devices. This review studies device structure state‐of‐the‐art devices thereby analyzes different approaches toward maximizing product PCE average visible transmittance. The origins losses during opaque‐to‐semitransparent transition discussed. In addition, critical practical aspects relevant all devices, compatibility top transparent electrode with structure, buffer layer optimization, light management engineering, scale‐up, stability, also reported. overview is expected facilitate across identify overcome challenges achieving higher utilization efficiencies STPVs.

Язык: Английский

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