20.6% Efficiency Organic Solar Cells Enabled by Incorporating a Lower Bandgap Guest Nonfullerene Acceptor Without Open‐Circuit Voltage Loss

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Abstract Simultaneously mitigating both photovoltage and photocurrent losses is crucial for organic solar cells (OSCs) to approach the Shockley–Queisser limit of ideal efficiency. Incorporating a narrower bandgap nonfullerene acceptor (NFA) as guest component into host donor:NFA system broadens absorption spectrum. However, this can also increase nonradiative decay rate according energy‐gap law. In work, ternary OSCs are constructed by combining narrow AQx‐2F (as NFA) with lower eC9 NFA), significantly enhancing generation without compromising photovoltage. The addition acts crystallization inducer, extending period increasing ordered packing distance. This leads suppressed trap states, elevated dielectric constant, prolonged exciton lifetime, balanced hole/electron transport, reduced recombination loss. Consequently, optimized D18:AQx‐2F:eC9 achieve champion power conversion efficiency (PCE) 20.6% high open‐circuit voltage 0.937 V, short‐circuit current density 27.2 mA cm −2 fill factor 80.8%, validated an independently certified PCE 20.0%, establishing new benchmark bulk heterojunction OSCs. work demonstrates effective method simultaneously mitigate losses, paving way high‐performance

Language: Английский

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Achieving 20% Efficiency in Organic Solar Cells Through Conformationally Locked Solid Additives

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Abstract Volatile solid additives (VSAs) have emerged as one of the most effective strategies for optimizing active layer morphology organic solar cells (OSCs). In this study, two VSAs, HBT‐1 and HBT‐2, are designed synthesized to investigate effect VASs’ conformation on photovoltaic performances. Compared HBT‐1, HBT‐2 incorporates internal noncovalent conformational locks (NoCLs), resulting in reduced disorder, improved molecular planarity, enhanced crystallinity. These features significantly influence intermolecular packing both donor acceptor materials layer, which can facilitate charge transport reduce recombination. Consequently, D18:L8‐BO:PY‐C11 OSCs utilizing additive achieved an impressive efficiency 20.01%, markedly higher than devices fabricated without (17.83%) those processed with (18.76%). Furthermore, demonstrated excellent compatibility across multiple systems. This work underscores NoCL strategy a straightforward approach designing VSAs high performance OSCs.

Language: Английский

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Doping a Main-Chain Twisted Wide Bandgap Bifunctional Molecule Enables Efficient Ternary Organic Solar Cells

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

The rapid development of organic solar cells (OSCs) has been particularly remarkable following the introduction high-performance small molecule electron acceptor Y6 and its derivatives. Despite advances in state-of-the-art OSCs, challenges remain, notably relatively low open circuit voltage (VOC) charge mobility imbalance, which continue to hinder further improvements OSCs' performance. To address these issues, this work, we synthesized a main-chain twisted wide bandgap i-IEDTB, not only possesses superior hole over but also higher lowest unoccupied molecular orbital (LUMO) energy levels, adopted it as bifunctional third compound couple with terpolymer Z10 based OSC system. integration i-IEDTB Z10:Y6 blend, either an or donor, significantly reduces excessive aggregation facilitates harmonized distribution mobilities by modulating crystallization properties materials. This strategic intervention leads marked improvement VOC fill factor (FF). Consequently, power conversion efficiency (PCE) optimized Z10:(Y6:i-IEDTB) ternary device is elevated impressive 17.70%, surpassing 16.50% binary OSC. Besides, after doping 5% weight replaced that Z10, device's VOC, FF were increased 0.846 V 78.08% respectively, resulting enhanced PCE 17.47%. Further investigation demonstrates universality PM6:BTP-eC9-based PM6:L8-BO-based achieving champion efficiencies 18.14 18.08%, respectively. work highlights key role complementary component crystallographic order carrier balance within Y-type acceptor-based OSCs.

Language: Английский

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Low‐Volatility Fused‐Ring Solid Additive Engineering for Synergistically Elongating Exciton Lifetime and Mitigating Trap Density Toward Organic Solar Cells of 20.5% Efficiency

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

Abstract Volatile solid additives (VSAs) with single or fused‐ring structures have attracted much attention for enhancing power conversion efficiencies (PCEs) of organic solar cells (OSCs). While the working mechanisms high‐volatility single‐ring been well studied, influence low‐volatility VSAs on molecular aggregations and exciton/carrier dynamics remains still unclear. Herein, 3,6‐dibromothieno[3,2‐b]thiophene (3,6TTBr) is selected as a representative VSA to elucidate its mechanism. Via theoretical experimental joint investigation, it found that rigid planar 3,6TTBr molecules adsorb onto terminal units L8‐BO (acceptor), inducing loose space adjacent molecules. The thus favors center‐terminal packing larger interfragment distance, which relieves over‐aggregation induces ordered packing. Consequently, treatment reduces aggregation‐caused quenching, photoluminescence quantum yield exciton lifetime film. combination above properties reduced trap density improved carrier transport in 3,6TTBr‐treated devices contributed PCE 20.1%. To validate broad applicability findings, 1,5‐dibromonaphthalene (1,5‐BN), another solid, explored. 1,5‐BN achieved an impressive 20.5%, verifying validity strategy boosting OSC performances.

Language: Английский

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Allyl-terminated Small Molecule Donors Effectively Regulate Miscibility to Improve the Performance of Organic Solar Cells

Journal of Materials Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Optimization of small molecule donor morphology in OSCs: allyl group-driven enhancements H35 for superior PCEs 15.21% (ASM) and 10.78% (SMD:PA) via improved miscibility, domain structure, charge transfer.

Language: Английский

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High‐Performance Photoactive Polymers: Innovations in Ternary Polymerization for Solar Applications

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 2, 2025

Abstract In recent years, polymer solar cells (PSCs) have achieved rapid progress, with power conversion efficiencies (PCEs) reaching up to 20.25%, driven by significant advancements in device fabrication and active‐layer materials. The ternary polymerization strategy has proven be a straightforward effective approach for developing high‐performance photoelectric polymers incorporating third monomer into the backbone. This incorporation effectively optimizes intrinsic properties, including UV–vis absorption, energy levels, solubility, crystallinity, morphology, charge transfer, mechanical robustness, batch‐to‐batch reproducibility, stability. review highlights latest designing photoactive copolymers (both donors acceptors), particular focus on stability, potential applications commercial development. aim is provide valuable guidance development of materials using strategy.

Language: Английский

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A systematic investigation on pyridine derived solid additives inducing fibrillar morphology for highly efficient organic solar cells with over 20 % efficiency

Materials Science and Engineering R Reports, Journal Year: 2025, Volume and Issue: 164, P. 100977 - 100977

Published: March 18, 2025

Language: Английский

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Impact of Linking‐Site on Photovoltaic Performance of Giant Molecular Acceptors Containing N‐Type Linker

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract Connecting small molecule acceptors through conjugated or nonconjugated linker to form giant molecular (GMAs) represents a strategic approach enhancing the morphological stability of organic solar cells (OSCs). In this study, we employed benzothiadiazole (BT) as typical n ‐type design and synthesize two GMAs linking‐site isomerization: i‐BT‐DY o‐BT‐DY. Compared i‐BT‐DY, o‐BT‐DY exhibits enhanced crystallinity more favorable face‐on orientation but lower electron mobility. This can be well explained by theoretical calculations, demonstrates delocalized LUMO distribution significantly stronger intramolecular super‐exchange coupling (43.7 meV versus 22.2 for o‐BT‐DY). Additionally, also red‐shifted absorption. Combining these attributes, PM6: blend achieved an impressive power conversion efficiency (PCE) 18.86%. The PCE further increased 19.49% in ternary blend. As expected, OSCs based on both exhibit exceptional long‐term photostability (T85% >1000 hours). work deepens our understanding how linkers at different linking sites influence performance GMAs, concluding that interaction, rather than intermolecular, are primary factor affecting charge transport acceptors. it highlights potential components OSCs.

Language: Английский

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Optimizing the ionization-energy offset for enhanced photovoltaic properties in bilayer organic solar cells

Physical Review Applied, Journal Year: 2025, Volume and Issue: 23(3)

Published: March 4, 2025

Language: Английский

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Breaking 20% Efficiency of all‐Polymer Solar Cells via Benzo[1,2‐d:4,5‐d′]Bisthiazole‐Based Terpolymer Donor Strategy for Fine Morphology Optimization

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 15, 2025

Abstract Developing high‐performance all‐polymer solar cells (all‐PSCs) remains a challenge due to the difficulty in controlling morphology of polymer blends. In this study, benzo[1,2‐d:4,5‐d′]bisthiazole (BBTz) is incorporated into PM6 main chain create series terpolymer donors, leveraging entropy increase and superior miscibility with acceptors modulate blend morphology. The introduction BBTz broadened absorption range, enhanced film crystallinity, significantly improved donor‐acceptor through its low dipole moment high electrostatic potential. This facilitated formation nanofiber structures active layer, thus optimizing As result, PBZ‐10:PY‐IT‐based device achieved an impressive power conversion efficiency (PCE) 19.06%. Incorporation PBQx‐TF binary can further improve morphology, charge transport, exciton lifetime, dissociation, collection, as well suppressed recombination, finally leading record‐breaking PCE 20.04% for all‐PSCs date. findings demonstrate effectiveness strategy enhancing all‐PSC performance. By molecular design component selection, approach provides viable pathway achieving higher supports advancement renewable energy technologies.

Language: Английский

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