Rigid- and soft-block-copolymerized conjugated polymers enable high-performance intrinsically stretchable organic solar cells

Joule, Journal Year: 2023, Volume and Issue: 8(1), P. 204 - 223

Published: Dec. 1, 2023

Language: Английский

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Two-Dimensional Conjugation Extended CH-Series Acceptors with a Distinctive A–D–A Character

Accounts of Materials Research, Journal Year: 2023, Volume and Issue: 4(9), P. 772 - 785

Published: Aug. 2, 2023

ConspectusAs one of the most important indicators for evaluating photovoltaic devices, power conversion efficiencies (PCEs) first-class organic solar cells (OSCs) have reached level ∼20%, but they still lag far behind that over 25% their inorganic counterparts. With similar if not better fill factor and short-circuit current, this wide gap PCEs should be fundamentally attributed to greatly larger nonradiative energy losses in OSCs, which are usually above 0.2 eV OSCs only 0.03–0.04 high-performance cells. Note stubbornly severe recombination is associated with multiple characteristics light-harvesting molecules, such as intrinsically large exciton binding energies small relative dielectric constants, defective intermolecular packing networks, or more crystal defects caused by flexibility molecular skeletons, nonideal nanoscale film morphologies, so on. All factors require rational design molecules carried out at single molecule also aggregation levels further dramatic improvement PCE achieved OSCs.In Account, we will first expound unique merits acceptor–donor–acceptor (A–D–A) type materials frontier orbital distribution, tuning, packings, meanwhile revealing dominant role A–D–A facilitating charge transfer/transport, suppressing loss, improving performance eventually. In light conspicuous superiority a convincing conclusion can made exploration novel crucially shrink between Second, our recent studies really exciting platform (CH-series) discussed comprehensively, involving various nonfullerene acceptors (NFAs) molecular, dimer-like, polymerized architectures. distinctive feature CH-series NFAs two-dimensional (2D) conjugation extension, especially central units. Therefore, favorable effects 2D extension these on fundamental physicochemical properties, modes, blended parameters, resulting fully discussed. Abiding unveiled rules NFAs, highest approaching 20% has been based molecules. The evolution path previous traditional PCBM, ITIC, Y6, etc. could lesson; very likely offer great capable achieving record-breaking along much decreased losses, considering structural modification possibilities. Finally, despite rapidly surging there several insurmountable hurdles when attempting break through bottlenecks existing OSCs. propose some perspectives conducted may conquer challenge too thus boost toward commercial applications further.

Language: Английский

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Regiospecific Incorporation of Acetylene Linker in High‐Electron Mobility Dimerized Acceptors for Organic Solar Cells with High Efficiency (18.8%) and Long 1‐Sun Lifetime (> 5000 h)

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(34)

Published: July 26, 2023

Abstract The commercialization of organic solar cells (OSCs) requires both high power conversion efficiency (PCE) and long‐term stability. However, the lifetime OSCs containing small‐molecule acceptors (SMA) should be significantly enhanced. In this study, a series planarity‐controlled is developed, electron mobility dimerized SMAs (DSMAs) realize with high‐performance (PCE = 18.8%) high‐stability ( t 80% 5380 h under 1‐Sun illumination). An acetylene linker planar triple bond designed for dimerization SMA units to afford backbone planarity necessary achieve crystallinity mobility. To further engineer molecular conformation DSMAs, different regioisomers Y‐based are yield three regioisomerically distinct denoted as DYA‐I, DYA‐IO, DYA‐O, respectively. It found that crystallinity, mobility, glass transition temperature DSMAs gradually increase in order which, turn, enhance PCE device stability resulting OSCs; DYA‐O 16.45% 3337 h) < DYA‐IO 17.54% 4255 DYA‐I 18.83% h).

Language: Английский

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Modular‐Approach Synthesis of Giant Molecule Acceptors via Lewis‐Acid‐Catalyzed Knoevenagel Condensation for Stable Polymer Solar Cells

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(35)

Published: June 16, 2023

The operational stability of polymer solar cells is a critical concern with respect to the thermodynamic relaxation acceptor-donor-acceptor (A-D-A) or A-DA'D-A structured small-molecule acceptors (SMAs) within their blends donors. Giant molecule (GMAs) bearing SMAs as subunits offer solution this issue, while classical synthesis via Stille coupling suffers from low reaction efficiency and difficulty in obtaining mono-brominated SMA, rendering approach impractical for large-scale low-cost preparation. In study, we present simple cost-effective challenge through Lewis acid-catalyzed Knoevenagel condensation boron trifluoride etherate (BF3 ⋅ OEt2 ) catalyst. We demonstrated that monoaldehyde-terminated A-D-CHO unit methylene-based A-link-A (or its silyl enol ether counterpart) substrates can be quantitatively achieved 30 minutes presence acetic anhydride, affording variety GMAs connected flexible conjugated linkers. photophysical properties was fully studied, yielding high device over 18 %. Our findings promising alternative modular yields, easier work up, widespread application such methodology will undoubtedly accelerate progress stable cells.

Language: Английский

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Over 18% Efficiency Ternary Organic Solar Cells with 300 nm Thick Active Layer Enabled by an Oligomeric Acceptor

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(2)

Published: Sept. 18, 2023

The development of high-efficiency thickness-insensitive organic solar cells (OSCs) is crucially important for the mass production panels. However, increasing active layer thickness usually induces a substantial loss in efficiency. Herein, ternary strategy which an oligomer DY-TF incorporated into PM6:L8-BO system as guest component adopted to break this dilemma. S···F intramolecular noncovalent interactions backbone endow with high planarity. Upon addition DY-TF, crystallinity blend effectively improved, leading increased charge carrier mobility, highly desirable fabrication thick-film devices. As result, thin-film PM6:L8-BO:DY-TF-based device (110 nm) shows power conversion efficiency (PCE) 19.13%. Impressively, when increases 300 nm, 18.23% (certified 17.8%) achieved, representing highest reported nm thick OSCs thus far. Additionally, blade-coated (300 delivers promising PCE 17.38%. This work brings new insights construction efficient tolerance, showing great potential roll-to-roll printing large-area cells.

Language: Английский

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Ultra Robust and Highly Efficient Flexible Organic Solar Cells with Over 18 % Efficiency Realized by Incorporating a Linker Dimerized Acceptor

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(41)

Published: Aug. 24, 2023

The wearable application of flexible organic solar cells (f-OSCs) necessitates high power conversion efficiency (PCE) and mechanical robustness. However, photoactive films based on efficient non-fullerene small molecule acceptors (NF-SMAs) are typically brittle, leading to poor stability in devices. In this study, we achieved a remarkable PCE 18.06 % f-OSCs while maintaining ultrahigh robustness (with crack-onset strain (COS) higher than 11 %) by incorporating linker dimerized acceptor (DOY-TVT). Compared binary blends, ternary systems exhibit reduced non-radiative recombination, suppressed crystallization diffusion NF-SMAs, improved load distribution across the chain networks, enabling dissipation energy. Thus, developed study achieved, stability, surpassing OSCs. Moreover, retained 97 initial even after 3000 bending cycles, indicating excellent (9.1 systems). Furthermore, rigid device with inverted structure optimal active layer exhibited substantial increase retention, 89.6 865 h at 85 °C 93 more 1300 shelf storage 25 °C. These findings highlight potential oligomer for realizing high-performing

Language: Английский

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Terminally Chlorinated and Thiophene‐linked Acceptor‐Donor‐Acceptor Structured 3D Acceptors with Versatile Processability for High‐efficiency Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(38)

Published: Aug. 7, 2023

Abstract To exploit the potential of our newly developed three‐dimensional (3D) dimerized acceptors, a series chlorinated 3D acceptors (namely CH8‐3/4/5) were reported by precisely tuning position chlorine (Cl) atom. The introduction Cl atom in central unit affects molecular conformation. Whereas, replacing fluorinated terminal groups (CH8‐3) with (CH8‐4 and CH8‐5), red‐shift absorption enhanced crystallization are achieved. Benefiting from these, all devices received promising power conversion efficiencies (PCEs) over 16 % as well decent thermal/photo‐stabilities. Among them, PM6:CH8‐4 based device yielded best PCE 17.58 %. Besides, merits multi alkyl chains enable their versatile processability during preparation. Impressive PCEs 17.27 16.23 could be achieved for non‐halogen solvent processable prepared glovebox ambient, respectively. 2.88 cm 2 modules also obtained 13 via spin‐coating blade‐coating methods, These results among performance acceptors. CH8‐4 on small‐area devices, solvent‐processed highlights processing capability applications future.

Language: Английский

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Strengthening the Hetero‐Molecular Interactions in Giant Dimeric Acceptors Enables Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Nov. 23, 2023

Abstract Giant dimeric acceptor (G‐Dimer) is becoming one of the most promising organic solar cell (OSC) materials because its definite structure, long‐term stability, and high efficiency. Strengthening hetero‐molecular interactions by monomer modification greatly influences morphology thus device performance, but lacks investigation. Herein, two novel quinoxaline core‐based G‐Dimers, Dimer‐QX Dimer‐2CF, are synthesized. By comparing trifluoromethyl‐substituted Dimer‐2CF non‐substituted Dimer‐QX, trifluoromethylation effect on G‐Dimer investigated revealed. The trifluoromethyl with strong electronegativity increases electrostatic potential reduces surface energy G‐Dimer, weakening homo‐molecular ordered packing reinforcing interaction donor. suppresses fast assembly during film formation, facilitating small domains molecular in blend, which a trade‐off conventional control. Together favorable vertical phase separation, efficient charge generation, reduced bimolecular recombination concurrently obtained. Hence, Dimer‐2CF‐based OSCs obtain cutting‐edge efficiency 19.02% fill factor surpassing 80%, an averaged extrapolated T 80 ≈12 000 h under continuous °C heating. This study emphasizes importance strategy, providing facile strategy for designing highly stable OSC materials.

Language: Английский

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Design of Star‐Shaped Trimer Acceptors for High‐Performance (Efficiency > 19%), Photostable, and Mechanically Robust Organic Solar Cells

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(8)

Published: Jan. 2, 2024

Abstract High power conversion efficiency (PCE), long‐term stability, and mechanical robustness are prerequisites for the commercial applications of organic solar cells (OSCs). In this study, a new star‐shaped trimer acceptor (TYT‐S) is developed high‐performance OSCs with PCE 19.0%, high photo‐stability ( t 80% lifetime = 2600 h under 1‐sun illumination), crack‐onset strain (COS) 21.6% achieved. The isotropic molecular structure TYT‐S affords efficient multi‐directional charge transport electron mobility. Furthermore, its amorphous prevents formation brittle crystal‐to‐crystal interfaces, significantly enhancing properties OSC. As result, TYT‐S‐based demonstrate higher (19.0%) stretchability (COS 21.6%) than linear‐shaped (TYT‐L)‐based (PCE 17.5% COS 6.4%) small‐molecule (MYT)‐based 16.5% 1.3%). addition, increased size TYT‐S, relative to that MYT dimer (DYT), suppresses diffusion kinetics molecules, substantially improving photostability OSCs. Finally, effectively potential intrinsically stretchable (IS)‐OSCs constructed. IS‐OSCs exhibit device (strain at 31%) 14.4%.

Language: Английский

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Correlating miscibility, mechanical parameters, and stability of ternary polymer blends for high-performance solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(11), P. 5052 - 5064

Published: Jan. 1, 2023

The established miscibility–function relationships are helpful to predict mechanical properties and stability in organic photovoltaic devices based on multicomponent systems.

Language: Английский

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