Halogenated Nonfused Ring Electron Acceptor for Organic Solar Cells with a Record Efficiency of over 17%

Advanced Materials, Год журнала: 2023, Номер 36(4)

Опубликована: Ноя. 23, 2023

Abstract Three nonfused ring electron acceptors (NFREAs), namely, 3TT‐C2‐F , 3TT‐C2‐Cl and 3TT‐C2 are purposefully designed synthesized with the concept of halogenation. The incorporation F or/and Cl atoms into molecular structure ( ) enhances π–π stacking, improves mobility, regulates nanofiber morphology blend films, thus facilitating exciton dissociation charge transport. In particular, films based on D18: demonstrate a high an extended diffusion distance, well‐formed network. These factors contribute to devices remarkable power conversion efficiency 17.19%, surpassing that (16.17%) (15.42%). To best knowledge, this represents highest achieved in NFREA‐based up now. results highlight potential halogenation NFREAs as promising approach enhance performance organic solar cells.

Язык: Английский

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Molecular Design of Fully Nonfused Acceptors for Efficient Organic Photovoltaic Cells

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(13), С. 9205 - 9215

Опубликована: Март 25, 2024

The nonfused thiophene–benzene–thiophene (TBT) unit offers advantages in obtaining low-cost organic photovoltaic (OPV) materials due to its simple structure. However, OPV cells, including TBT-based acceptors, exhibit significantly lower energy conversion efficiencies. Here, we introduce a novel approach involving the design and synthesis of three acceptors by substituting different position-branched side chains on TBT unit. In comparison TBT-10 TBT-11, TBT-13, which exclusively incorporates α-position branched with large steric hindrance, demonstrates more planar stable conformation. When blended donor PBQx-TF, TBT-13-based blend film achieves favorable π–π stacking aggregation characteristics, resulting excellent charge transfer performance corresponding device. Due simultaneous enhancements short-circuit current density fill factor, cell obtains an outstanding efficiency 16.1%, marking highest value for cells based fully acceptors. Our work provides practical molecular strategy high-performance materials.

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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Precisely Manipulating Molecular Packing via Tuning Alkyl Side‐Chain Topology Enabling High‐Performance Nonfused‐Ring Electron Acceptors

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(10)

Опубликована: Янв. 8, 2024

In the development of high-performance organic solar cells (OSCs), self-organization semiconductors plays a crucial role. This study focuses on precisely manipulation molecular assemble via tuning alkyl side-chain topology in series low-cost nonfused-ring electron acceptors (NFREAs). Among three NFREAs investigated, DPA-4, which possesses an asymmetric length, exhibits tight packing crystal and high crystallinity film, contributing to improved mobility favorable film morphology for DPA-4. As result, OSC device based DPA-4 achieves excellent power conversion efficiency 16.67 %, ranking among highest efficiencies NFREA-based OSCs.

Язык: Английский

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Molecular Design for Vertical Phase Distribution Modulation in High‐Performance Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(23)

Опубликована: Март 4, 2024

Component distribution within the photoactive layer dictates morphology and electronic structure substantially influences performance of organic solar cells (OSCs). In this study, a molecular design strategy is introduced to manipulate component energetics by adjusting side-chain polarity. Two non-fullerene acceptors (NFAs), ITIC-16F ITIC-E, are synthesized introducing different polar functional substituents onto side chains ITIC. The alterations result in tendencies bulk heterojunction film: with intensified hydrophobicity aligns predominantly top surface, while ITIC-E strong hydrophilicity gravitates toward bottom. This divergence directly impacts vertical excitation energy levels, thereby influencing kinetics over extended time periods larger spatial ranges including enhanced diffusion-mediated exciton dissociation stimulated charge carrier transport. Benefitting from favorable distribution, device incorporating into PBQx-TF:eC9-2Cl blend showcases an impressive power conversion efficiency 19.4%. work highlights polarity manipulation as promising for designing efficient NFA molecules underscores pivotal role OSC performance.

Язык: Английский

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Achieving 19.78%‐Efficiency Organic Solar Cells by 2D/1A Ternary Blend Strategy with Reduced Non‐Radiative Energy Loss

Advanced Functional Materials, Год журнала: 2024, Номер 34(44)

Опубликована: Июнь 2, 2024

Abstract Reducing non‐radiative energy loss (∆ E nr ) is critical for enhancing the photovoltaic performance of organic solar cells (OSCs). To achieve this, a small molecular donor, LJ1, introduced as third component in host system D: A (D18: BTP‐eC9‐4F). The cascade‐like level alignment D18, and BTP‐eC9‐4F facilitates efficient charge transfer. LJ1's good solubility processing solvent high miscibility with delay precipitation BTP‐eC9‐4F, leading to improved phase morphology blend films. Additionally, LJ1 increases spacing between polymer donor (PD) molecule acceptor (SMA), optimizing film reducing OSCs. Ternary OSCs based on D18:LJ1:BTP‐eC9‐4F power conversion efficiency (PCE) 19.43% reduced ∆ . Notably, ternary device using D18:LJ1:L8‐BO attains an outstanding PCE 19.78%, which one highest OSC. work highlights effectiveness strategy OSC while minimizing

Язык: Английский

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

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 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

Язык: Английский

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Achieving High Fill Factor in Organic Photovoltaic Cells by Tuning Molecular Electrostatic Potential Fluctuation

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(17)

Опубликована: Март 7, 2024

Abstract In the field of organic photovoltaics (OPVs), significant progress has been made in tailoring molecular structures to enhance open‐circuit voltage and short‐circuit current density. However, there remains a crucial gap development coordinated material design strategies focused on improving fill factor (FF). Here, we introduce strategy that incorporates electrostatic potential fluctuation photovoltaic materials. By reducing amplitude IT‐4F, synthesized new acceptor named ITOC6‐4F. When using PBQx‐TF as donor, ITOC6‐4F‐based cell shows markedly low recombination rate constant 0.66×10 −14 cm 3 s −1 demonstrates an outstanding FF 0.816, both which are records for binary OPV cells. Also, find small could decrease energetic disorder cells, energy loss. Finally, creates highest efficiency 16.0 % among medium‐gap Our work holds vital implication guiding high‐performance

Язык: Английский

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Generalized nonequilibrium Fermi’s golden rule and its semiclassical approximations for electronic transitions between multiple states

The Journal of Chemical Physics, Год журнала: 2024, Номер 160(3)

Опубликована: Янв. 19, 2024

The nonequilibrium Fermi's golden rule (NE-FGR) approach is developed to simulate the electronic transitions between multiple excited states in complex condensed-phase systems described by recently proposed multi-state harmonic (MSH) model Hamiltonian. MSH models were constructed faithfully capture photoinduced charge transfer dynamics a prototypical organic photovoltaic carotenoid-porphyrin-C60 molecular triad dissolved tetrahydrofuran. A general expression of fully quantum-mechanical NE-FGR rate coefficients for all pairs obtained. Besides, linearized semiclassical formula and series approximations featuring Wigner classical nuclear sampling choices different during quantum coherence period are derived. current enables possible population pathways triad, contrast previous applications that only addressed donor-to-acceptor transition. Our simulations two conformations serve as demonstration benchmarking show difference levels approximation small system, especially at room temperature. By comparing with nonadiabatic dynamics, we observe similar timescales predicted NE-FGR. It believed formulation Hamiltonian variety realistic systems.

Язык: Английский

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Comprehensive Insight into the Structure Contribution of A₂‐A₁‐D‐A₁‐A₂ Acceptor to Performance of P3HT Solar Cells

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

Опубликована: Фев. 8, 2024

Abstract Poly(3‐hexylthiophene) (P3HT) acting as one of the most popular and low‐cost polymers is quite suitable for commercialization organic solar cells but suffers from low power conversion efficiency (PCE) because limited matching non‐fullerene acceptors (NFAs). One important reason that restricts enhancement remains unresolved undisclosed contributions subtle structure modification to obvious performance change. In combination with previous reports this work, herein A 2 ‐A 1 ‐D‐A type NFAs single, dual, triple modifications based on parent BTA3 designed, including benzyl‐substitution group (namely Bn modification), fluorine‐substitution F thieno[3,2‐ b ]thiophene‐substitution D TT modification). It finally found binary devices P3HT these underwent unexpected variations in aspect molecular optoelectronic property, blend morphological feature charge generation process. The (including Bn, F, TT) gives full play their unique advantages consequently increases PCE by 60%. To knowledge, obtained optimal highest values NFAs. This study provides clearer insights into rational substitutions matched high‐performance photovoltaics.

Язык: Английский

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