Design of Non-fused Ring Acceptors toward High-Performance, Stable, and Low-Cost Organic Photovoltaics

Accounts of Materials Research, Journal Year: 2022, Volume and Issue: 3(6), P. 644 - 657

Published: May 25, 2022

ConspectusToward future commercial applications of organic solar cells (OSCs), photovoltaic materials that enable high efficiency, excellent stability, and low cost should be developed. Fused-ring electron acceptors (FREAs) have declared OSCs are capable showing efficiencies over 19%, whereas stability not solved yet. As the counterparts FREAs, non-fused ring (NFREAs) more flexible in molecular design. They better because reduction intramolecular tension via breaking fused backbone advantages with synthetic complexity. However, challenge for NFREAs is relatively lower (around 15% at current stage), which require designs addressing issues conformational unicity effective packing.In this Account, we comprehensively summarize works about carried out our group from three main frameworks, including design efficiency optimization, material cost, stability. First, part existing rotatable single bond will bring problem uncertainty, but it can through proper design, also regulates energy levels, light absorption range, packing mode molecule obtaining higher performance. Thus, part, discuss evolution aspects, skeleton terminal modification, side chain engineering. Many strategies used a skeleton, such as utilizing quinoid effect, introducing functional groups push–pulling using multiple lock. Furthermore, simplifying preferred development tendency. terminal, modification strategy adjusting conjugation length halogen atoms. What more, by to induce appropriate steric hindrance, fix orientation molecules, thus regulating modes. Second, regarding compare synthesis complexities between state-of-the-art FREAs NFREAs. Because processes reduce complex cyclization reactions, routes greatly simplified, obtained minimal steps. Third, analyze workable views intrinsic photostability, thermal Finally, conclude challenges conquered propose perspectives could performed NFREAs, hope pushing toward performance, cost.

Language: Английский

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Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

Aggregate, Journal Year: 2022, Volume and Issue: 3(6)

Published: Oct. 13, 2022

Abstract The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have improved considerably in recent years with the development fused‐ring electron acceptors (FREAs). Currently, FREAs‐based OSCs achieved high PCEs over 19% single‐junction OSCs. Whereas relatively synthetic complexity and low yield FREAs typically result production costs, hindering commercial application In contrast, noncovalently (NFREAs) can compensate for shortcomings facilitate large‐scale industrial by virtue simple structure, facile synthesis, yield, cost, reasonable efficiency. At present, based on NFREAs exceeded 15% are expected to reach comparable efficiency as Here, advances this review provide insight into improving performance particular, paper focuses effect chemical structures molecule conformation, aggregation, packing mode. Various molecular design strategies, such core, side‐chain, terminal group engineering, presented. addition, some novel polymer all‐polymer also introduced. end, provides an outlook developing efficient, stable, low‐cost achieving applications.

Language: Английский

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20.2% Efficiency Organic Photovoltaics Employing a π‐Extension Quinoxaline‐Based Acceptor with Ordered Arrangement

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(33)

Published: June 20, 2024

Organic solar cells, as a cutting-edge sustainable renewable energy technology, possess myriad of potential applications, while the bottleneck problem less than 20% efficiency limits further development. Simultaneously achieving an ordered molecular arrangement, appropriate crystalline domain size, and reduced nonradiative recombination poses significant challenge is pivotal for overcoming limitations. This study employs dual strategy involving development novel acceptor ternary blending to address this challenge. A non-fullerene acceptor, SMA, characterized by highly arrangement high lowest unoccupied orbital level, synthesized. By incorporating SMA guest in PM6:BTP-eC9 system, it observed that staggered liquid-solid transition donor facilitating crystallization ordering maintaining suitable size. Furthermore, optimized vertical morphology bimolecular recombination. As result, device achieved champion 20.22%, accompanied increased voltage, short-circuit current density, fill factor. Notably, stabilized 18.42% attained flexible devices. underscores synergistic approach integrating material innovation techniques optimizing bulk heterojunction photovoltaic performance.

Language: Английский

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3D acceptors with multiple A–D–A architectures for highly efficient organic solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(4), P. 1773 - 1782

Published: Jan. 1, 2023

Efficient 3D NFAs through central unit connection blaze a new trail in further molecular structural optimization of state-of-the-art NFAs.

Language: Английский

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Geometry design of tethered small-molecule acceptor enables highly stable and efficient polymer solar cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 22, 2023

With the power conversion efficiency of binary polymer solar cells dramatically improved, thermal stability small-molecule acceptors raised main concerns on device operating stability. Here, to address this issue, thiophene-dicarboxylate spacer tethered are designed, and their molecular geometries further regulated via thiophene-core isomerism engineering, affording dimeric TDY-α with a 2, 5-substitution TDY-β 3, 4-substitution core. It shows that processes higher glass transition temperature, better crystallinity relative its individual acceptor segment isomeric counterpart TDY-β, more stable morphology donor. As result, based delivers 18.1%, most important, achieves an extrapolated lifetime about 35000 hours retaining 80% initial efficiency. Our result suggests proper geometry design, can achieve both high

Language: Английский

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Recent progress in flexible organic solar cells

eScience, Journal Year: 2022, Volume and Issue: 3(1), P. 100085 - 100085

Published: Nov. 17, 2022

Photovoltaic cells are one of the most promising renewable energy sources to address and environmental issues. Amongst many photovoltaic technologies, organic solar (OSCs) have numerous advantages, such as low cost, light weight, semi-transparency, flexibility. This last is a special merit OSCs, arising due intrinsic flexibility active layers. With applications in fields building-integrated photovoltaics wearable electronics, flexible OSCs (F-OSCs) developed rapidly, significant process has been made recent years. In this review, we summarize progress F-OSCs from perspective transparent electrodes. addition, large-area their potential briefly discussed. Finally, challenges for further development presented.

Language: Английский

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A-π-A structured non-fullerene acceptors for stable organic solar cells with efficiency over 17%

Science China Chemistry, Journal Year: 2022, Volume and Issue: 65(7), P. 1374 - 1382

Published: May 25, 2022

Language: Английский

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Tethered Small‐Molecule Acceptors Simultaneously Enhance the Efficiency and Stability of Polymer Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(2)

Published: Nov. 17, 2022

Abstract For polymer solar cells (PSCs), the mixture of donors and small‐molecule acceptors (SMAs) is fine‐tuned to realize a favorable kinetically trapped morphology thus commercially viable device efficiency. However, thermodynamic relaxation mixed domains within blend raises concerns related long‐term operational stability devices, especially in record‐holding Y‐series SMAs. Here, new class dimeric Y6‐based SMAs tethered with differential flexible spacers reported regulate their aggregation behavior. In blends PM6, it found that they favor an improved structural order relative Y6 counterpart. Most importantly, show large glass transition temperatures suppress domains. high‐performing blend, unprecedented open circuit voltage 0.87 V realized conversion efficiency 17.85%, while those regular Y6‐base devices only reach 0.84 16.93%, respectively. dimer‐based possesses substantially reduced burn‐in loss, retaining more than 80% initial after operating at maximum power point under continuous illumination for 700 h. The tethering approach provides direction develop PSCs high excellent stability.

Language: Английский

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Near-infrared absorbing acceptor with suppressed triplet exciton generation enabling high performance tandem organic solar cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: March 4, 2023

Reducing the energy loss of sub-cells is critical for high performance tandem organic solar cells, while it limited by severe non-radiative voltage via formation non-emissive triplet excitons. Herein, we develop an ultra-narrow bandgap acceptor BTPSeV-4F through replacement terminal thiophene selenophene in central fused ring BTPSV-4F, constructing efficient cells. The substitution further decrease optical BTPSV-4F to 1.17 eV and suppress exciton BTPSV-4F-based devices. cells with as demonstrate a higher power conversion efficiency 14.2% record short-circuit current density 30.1 mA cm-2 low 0.55 benefitted from due suppression formation. We also high-performance medium O1-Br front By integrating PM6:O1-Br based PTB7-Th:BTPSeV-4F rear cell demonstrates 19%. results indicate that excitons near-infrared-absorbing molecular design effective way improve photovoltaic

Language: Английский

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High‐Performance Organic Solar Cells Containing Pyrido[2,3‐b]quinoxaline‐Core‐Based Small‐Molecule Acceptors with Optimized Orbit Overlap Lengths and Molecular Packing

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(30)

Published: May 26, 2023

Abstract The central core in A‐DA 1 D‐A‐type small‐molecule acceptor (SMAs) plays an important role determining the efficiency of organic solar cells (OSCs), while principles governing efficient design SMAs remain elusive. Herein, we developed a series with pyrido[2,3‐ b ]quinoxaline (PyQx) as new electron‐deficient unit by combining cascade‐chlorination strategy, namely Py1, Py2, Py3, Py4 and Py5. introduction chlorine atoms reduces intramolecular charge transfer effects but elevates LUMO values. Density functional theory (DFT) reveals that Py2 ortho substituted PyQx Py5 two yield larger dipole moments smaller π⋅⋅⋅π stacking distances, compared other three acceptors. Moreover, shows strongest light absorption capability induced extended orbit overlap lengths more packing structures dimers. These features endow best device performance due to better molecular aggregation behaviors, suitable domain sizes exciton dissociation recombination. This study highlights significance incorporating large moments, small distances dimers into development high‐performance SMAs, providing insight for OSCs.

Language: Английский

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