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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Selenium substitution for dielectric constant improvement and hole-transfer acceleration in non-fullerene organic solar cells

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

Опубликована: Март 7, 2024

Abstract Dielectric constant of non-fullerene acceptors plays a critical role in organic solar cells terms exciton dissociation and charge recombination. Current feature dielectric 3-4, correlating to relatively high recombination loss. We demonstrate that selenium substitution on acceptor central core can effectively modify molecule constant. The corresponding blend film presents faster hole-transfer ~5 ps compared the sulfur-based derivative (~10 ps). However, blends with Se-acceptor also show after 100 upon optical pumping, which is explained by disordered stacking Se-acceptor. Encouragingly, dispersing an optimized cell system interrupt aggregation while still retain With improved fibril morphology, ternary device exhibits obvious reduction non-radiative 0.221 eV efficiency 19.0%. This work unveils heteroatom-substitution induced improvement, associated dynamics morphology manipulation, finally contributes better material/device design performance.

Язык: Английский

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

Advanced Energy Materials, Год журнала: 2024, Номер 14(19)

Опубликована: Март 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

Язык: Английский

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Halogenated Dibenzo[f,h]quinoxaline Units Constructed 2D‐Conjugated Guest Acceptors for 19% Efficiency Organic Solar Cells

Advanced Science, Год журнала: 2024, Номер 11(31)

Опубликована: Июнь 17, 2024

Abstract Halogenation of Y‐series small‐molecule acceptors (Y‐SMAs) is identified as an effective strategy to optimize photoelectric properties for achieving improved power‐conversion‐efficiencies (PCEs) in binary organic solar cells (OSCs). However, the effect different halogenation 2D‐structured large π‐fused core guest Y‐SMAs on ternary OSCs has not yet been systematically studied. Herein, four 2D‐conjugated (X‐QTP‐4F, including halogen‐free H‐QTP‐4F, chlorinated Cl‐QTP‐4F, brominated Br‐QTP‐4F, and iodinated I‐QTP‐4F) by attaching halogens into 2D‐conjugation extended dibenzo[ f , h ]quinoxaline are developed. Among these X‐QTP‐4F, Cl‐QTP‐4F a higher absorption coefficient, optimized molecular crystallinity packing, suitable cascade energy levels, complementary with PM6:L8‐BO host. Moreover, among PM6:L8‐BO:X‐QTP‐4F blends, PM6:L8‐BO:Cl‐QTP‐4F obtains more uniform size‐suitable fibrillary network morphology, well vertical phase distribution, thus boosting charge generation, transport, extraction, suppressing loss OSCs. Consequently, PM6:L8‐BO:Cl‐QTP‐4F‐based achieve 19.0% efficiency, which state‐of‐the‐art based superior devices host (17.70%) guests H‐QTP‐4F (18.23%), Br‐QTP‐4F (18.39%), I‐QTP‐4F (17.62%). The work indicates that promising gain efficient

Язык: Английский

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Sensitive SWIR Organic Photodetectors with Spectral Response Reaching 1.5 µm

Advanced Materials, Год журнала: 2024, Номер 36(41)

Опубликована: Авг. 17, 2024

Abstract The performance of organic photodetectors (OPDs) sensitive to the short‐wavelength infrared (SWIR) light lags behind commercial indium gallium arsenide (InGaAs) primarily due scarcity semiconductors with efficient photoelectric responses exceeding 1.3 µm. Limited by Energy‐gap law, ultralow‐bandgap usually suffer from severe non‐radiative transitions, resulting in low external quantum efficiency (EQE). Herein, a difluoro‐substituted quinoid terminal group (QC‐2F) exceptionally strong electron‐negativity is developed for constructing new non‐fullerene acceptor (NFA), Y‐QC4F an ultralow bandgap 0.83 eV. This subtle structural modification significantly enhances intermolecular packing order and density, enabling absorption onset up 1.5 µm while suppressing non‐radiation recombination films. SWIR OPDs based on achieve impressive detectivity ( D *) over 10 11 Jones 0.4 under 0 V bias, maximum 1.68 × 12 at 1.16 Furthermore, demonstrate competitive high‐quality imaging even 1.4 irradiation.

Язык: Английский

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Multi‐Selenophene Strategy Enables Dimeric Acceptors‐Based Organic Solar Cells with over 18.5% Efficiency

Advanced Energy Materials, Год журнала: 2024, Номер 14(30)

Опубликована: Май 9, 2024

Abstract Dimeric acceptor (DMA) becomes a promising alternative to small‐molecular and polymeric acceptor‐based organic solar cells (OSCs) due its well‐defined chemical structure, high batch‐to‐batch reproducibility, low molecular diffusion properties. However, DMAs usually exhibit blueshifted absorptions, limiting their photon utilization abilities. Herein, multi‐selenophene strategies are adopted develop redshifted DMAs. From monomer (YSe) dimers (DYSe‐1 DYSe‐2), reduced electron reorganization energies exciton binding enable the efficient charge dynamics in DMAs‐based OSCs. Together with effective absorption extending ≈920 nm, DYSe‐1‐ DYSe‐2‐ based OSCs outstanding short‐circuit current densities ( J SC s) over 27 mA cm −2 , which best among Besides, compared YSe‐based device, both DMA‐based devices have higher electroluminescence quantum efficiencies thus reduce nonradiative recombination loss (ΔE 3 ), contributing energy losses. The resultant open‐circuit voltages V OC of ≈0.88 V, which, combining super values, lead power conversion 18.56% 18.22%, respectively. These results highlight great potential strategy for development performance.

Язык: Английский

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Quinoxaline-based Y-type acceptors for organic solar cells

Chemical Science, Год журнала: 2024, Номер 15(22), С. 8265 - 8279

Опубликована: Янв. 1, 2024

Minimizing energy loss plays a critical role in the quest for high-performance organic solar cells (OSCs). However, origin of large OCSs is complicated, involving strong exciton binding semiconductors, nonradiative charge-transfer state decay, defective molecular stacking network, and so on. The recently developed quinoxaline (Qx)-based acceptors have attracted extensive interest due to their low reorganization energy, high structural modification possibilities, distinctive packing modes, which contribute reduced superior charge generation/transport, thus improving photovoltaic performance OSCs. This perspective summarizes design strategies Qx-based (including small-molecule, giant dimeric polymeric acceptors) resulting optoelectronic properties device performance. In addition, ternary strategy introducing as third component reduce briefly discussed. Finally, some perspectives further exploration toward efficient, stable, industry-compatible OSCs are proposed.

Язык: Английский

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Intrinsic Reactivity Index as Descriptor for Accurately Predicting Short-Circuit Current Density in Ternary Organic Solar Cells

ACS Applied Energy Materials, Год журнала: 2025, Номер 8(1), С. 36 - 42

Опубликована: Янв. 1, 2025

Designing high short-circuit current density (JSC) nonfullerene acceptor (NFA)-based ternary organic solar cells (OSCs) is challenging due to the vast diversity of materials. This study presents an eXtreme Gradient Boosting (XGBoost) model utilizing intrinsic reactivity index (IRI) for accurate JSC prediction, achieving R2 0.86. Feature importance analysis reveals that electrophilicity NFAs significantly influences JSC. The model's predictions align well with experimental values from three fabricated devices and exhibit excellent generalization OSCs 19% power conversion efficiency reported in literature. These findings offer avenues advancing NFA-based enhanced through intelligent design.

Язык: Английский

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Preparation of Dual-Asymmetric Acceptors via Selenium Substitution Combined with Terminal Group Optimization Strategy for High Efficiency Organic Solar Cells

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Фев. 25, 2025

Improving both the open-circuit voltage (VOC) and short-circuit current density (JSC) through development of photovoltaic materials to achieve high power conversion efficiency (PCE) is critical a significant challenge for organic solar cells (OSCs). Here, we designed novel dual-asymmetric acceptors A-SSe-TCF A-SSe-LSF by simultaneously asymmetrically regulating backbone terminal groups investigated their synergistic effects on performance in comparison with monoasymmetric acceptor A-SSe-4F. The exhibit broader spectral absorption larger half-molecule dipole moment differences, which favored enhancement JSC reduction energy loss (Eloss). Among binary blends, PM6:A-SSe-TCF exhibits superior phase separation, vertical distribution morphology, more ordered π-π stacking compared PM6:A-SSe-LSF PM6:A-SSe-4F. As result, OSCs based achieved higher PCE 18.53% VOC due suppressed nonradiative recombination enhanced charge extraction capabilities. Furthermore, incorporating as third component, PM6:L8-BO:A-SSe-TCF-based device achieves champion 19.73% without account decrement Eloss. strategy provides new insights into molecular design improvement OSCs.

Язык: Английский

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Synergy Effect of Symmetry-Breaking and End-Group Engineering Enables 16.06% Efficiency for All-Small-Molecule Organic Solar Cells

ACS Materials Letters, Год журнала: 2024, Номер 6(2), С. 713 - 719

Опубликована: Янв. 25, 2024

Molecular innovation is an urgent necessity to realize efficient all-small-molecule organic solar cells (ASM-OSCs). Asymmetric strategy and end-group engineering have been widely utilized for photovoltaic materials with great success. However, the synergistic effect of asymmetric combined on blend film morphology performance remains insufficiently explored. In this vein, two small molecule donors thiophene/thiazolyl side chains different end-groups 3-(2-ethylhexyl)-2-thioxo-4-thiazolidinone (Reh) cyanoacetic acid esters (CA), W2-CA W2-Reh, were designed gain insight into effects symmetry-breaking engineering. Compared exhibits a preferable face-on orientation good bicontinuous phase-separated morphology, which benefit improving carrier mobility ensuring high-efficiency charge transfer pathway in blended films. 16.06% power conversion efficiency (PCE) achieved W2-CA-based ASM-OSCs, one highest efficiencies reported up now binary ASM-OSCs. A promising avenue donor design provided achieve

Язык: Английский

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