Cascaded Energy and Charge Transfer Synergistically Prompting 18.7% Efficiency of Layered Organic Solar Cells with 1.48 eV Bandgap

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

Published: Jan. 2, 2025

Abstract Series of layer‐by‐layer organic solar cells (LOSCs) are constructed by sequentially spin‐coating donor layer and acceptor layers. A champion power conversion efficiency (PCE) 18.79% is achieved from the LOSCs with PBQx‐TCl/ITIC/PY‐DT as active layers, which should be one top values among OSCs optical bandgap over 1.48 eV. The middle material ITIC has a complementary photon harvesting range PBQx‐TCl PY‐DT, leading to enhanced Meanwhile, can play vital role in energy charge transfer relay increase exciton utilization transport, confirmed varied FFs normal or inverted ITIC/PY‐DT PY‐DT/ITIC Over 7% PCE improvement employing form cascaded This work may provide an efficient strategy for improving performance LOSCs.

Language: Английский

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Achieving 19.72% Efficiency in Ternary Organic Solar Cells through Electrostatic Potential‐Driven Morphology Control

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 9, 2024

Abstract The ternary strategy has proven effective in enhancing the performance of organic solar cells (OSCs), yet identifying optimal third component remains a challenge due to lack theoretical frameworks for predicting its impact based on molecular structure. This study addresses this by proposing quantitative parameters derived from surface electrostatic potential (ESP) as criteria selecting components. asymmetric acceptor BTP‐OS, which exhibits lower total average ESP and larger polarization index relative host acceptor, is introduced into PM6:L8‐BO system. incorporation led weakened ESP‐induced intermolecular interactions reduce miscibility with donor polymer, resulting an optimized multi‐scale morphology blend. Consequently, device achieved efficiency 19.72%, one highest values PM6:L8‐BO‐based devices, enhanced exciton dissociation charge collection, energy disorder, minimized non‐radiative losses. Comparable improvements are also verified PM6:BTP‐eC9 D18:N3 systems, demonstrating broad applicability proposed approach. not only provides practical principle components but establishes broader framework optimizing OSCs, potentially advancing development more efficient OSCs across diverse material systems.

Language: Английский

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Achieving Finely Optimized Morphology and Highly Efficient Layer-by-Layer Organic Solar Cells via Fluorinated Quinoxaline-Based Polymer Additives

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Vertical phase-separated active layer morphology is essential for organic solar cells (OSCs), which can be effectively achieved through layer-by-layer (LbL) processing, enabling independent optimization of donor and acceptor layers. Here, we present a novel strategy to optimize the D18/L8-BO-based OSCs by incorporating polyfluoroquinoxaline-type polymer additives. Three quinoxaline-based polymers with varying fluorination contents, namely, P2FQx, P3FQx, P4FQx, were synthesized evaluated. Although these showed limited performance as standalone materials in bulk heterojunction (BHJ) devices, their use additives LbL-OSCs significantly enhanced device efficiency. These promoted D18 aggregation, L8-BO penetration, facilitated formation vertically interpenetrating donor/acceptor network. Among additives, P2FQx demonstrated best performance, an optimized achieving champion power conversion efficiency (PCE) 20.13% well high fill factor (FF) 80.13%. Our results highlight potential rationally designed address morphology-related challenges provide pathway further development high-performance scalable photovoltaic devices.

Language: 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, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 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.

Language: Английский

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Precise Control Over Crystallization Kinetics by Combining Nucleating Agents and Plasticizers for 20.1% Efficiency Organic Solar Cells

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

Published: March 11, 2025

Abstract Obtaining controllable active layer morphology plays a significant role in boosting the device performance of organic solar cells (OSCs). Herein, quaternary strategy, which incorporates polymer donor D18‐Cl and small molecule acceptor AITC into host D18:N3, is employed to precisely modulate crystallization kinetics for favorable evolution within layer. In situ spectroscopic measurements during film‐formation demonstrate that while works as nucleator promote aggregation D18 foster donor/acceptor intermixing, has exactly opposite impact on N3 intermixing acceptor, working plasticizer. The mutually compensational effect dual‐guests, result, enables synergistic control over fibrillar networks, multi‐length scale morphology, vertical phase distribution, leading optimized 3D greatly enhanced exciton dissociation charge transfer, suppressed recombination, reduced energy loss. Consequently, OSCs based D18:D18‐Cl:N3:AITC achieved an excellent power conversion efficiency 20.1%, represents one highest efficiencies single‐junction OSCs. This work presents effective strategy regulate toward advanced high‐performance

Language: Английский

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A highly crystalline small molecule donor based on bithiazole units enabling efficient ternary all-small-molecule organic solar cells

Journal of Energy Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Enhancing the Thermal Stability of Organic Solar Cells by Locking Morphology with Ethyl Cellulose Additive

Solar RRL, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

The morphology of active layer the organic solar cells (OSCs) tends to transition toward its lowest energy conformation under thermal stress, significantly limiting stability OSCs. In this study, ethyl cellulose (EC) is utilized as an additive in typical PM6:Y6 and other systems. Due strong interaction between hydroxyl groups EC heteroatoms semiconductors, their bulk heterojunction nanomorphology locked, thereby enhancing device stability. Under stress at 65 °C for 1,000 h, incorporating demonstrates excellent nearly without performance loss. Furthermore, compared control device, exhibits improved a range more stringent aging conditions. Additionally, shows broad applicability various systems, effectively This work offers promising approach developing stable structures

Language: Английский

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Green synthesis of simple electron acceptors featuring non-covalent conformational locking and their application in ternary polymer solar cells achieving 18.61% efficiency

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162659 - 162659

Published: April 1, 2025

Language: Английский

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Dual Side Chain Functionalization of Small Molecule Acceptors Affords High‐Performance Organic Solar Cells With Refined Blend Morphology

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

Published: April 21, 2025

Abstract Regulating blend morphology in photoactive films is essential for enhancing the power conversion efficiency (PCE) of organic solar cells (OSCs). However, achieving precise control over remains a significant challenge due to difficulty simultaneously controlling thermodynamic and kinetic parameters that govern formation. In this study, series new small‐molecule acceptors (SMAs) employing dual side chain functionalization strategy designed incorporates trifluoromethyl (CF 3 ) phenyl (Ph) groups: SMA‐CH , SMA‐CF (with CF group), SMA‐Ph‐CF both groups). This approach successfully enables delicate tuning development high‐performance OSCs (PCE = 18.5%). enhances compatibility SMAs with hydrophobic D18 polymer donor, promoting formation intermixed donor/acceptor domains efficient charge generation. Meanwhile, improves SMA aggregation crystallinity, facilitating strong interconnected assembly transport. As result, binary based on D18:SMA‐Ph‐CF achieve significantly higher PCE 18.5%, compared 14.3% D18:SMA‐CH 16.5% D18:SMA‐CF OSCs. These results highlight importance optimizing

Language: Английский

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Tailoring selenium alkyl chain-containing small molecule donor enables efficient ternary solar cells with reduced charge recombination

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 513, P. 163009 - 163009

Published: April 23, 2025

Language: Английский

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