Achieving High‐Efficiency in Binary Organic Solar Cells by the Structural Fine‐Tuning of Coumarin‐Based Donor

Solar RRL, Год журнала: 2023, Номер 7(10)

Опубликована: Март 2, 2023

The choice of molecular material plays a crucial role in improving the performance organic solar cells. Herein, two coumarin‐based small molecules are designed and synthesized which π‐system is extended by introduction double bonds. differed attachment central acceptor units. replacement carbonyl group C3 dicyanomethylene unit C3–CN red‐shift absorption, reduced energy gap, stabilized highest occupied orbital lowest unoccupied levels. When blended with complementary absorbing all‐fused F13, binary devices using donor delivered power conversion efficiency (PCE) 11.09%. In contrast, C3–CN:F13‐based device displayed an impressive PCE 14.84% due to obvious increase all open circuit voltage, short current density, fill factor values. inclusion CN backbone induces tighter intermolecular packing, beneficial for charge transport properties. study demonstrates that subtle modification conjugation length tuning level proper could be promising way improve device's performance.

Язык: Английский

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Fine-tuning of film morphology through addition of a third component enables organic solar cells with efficiency over 18%

Materials Chemistry Frontiers, Год журнала: 2024, Номер 8(15), С. 2657 - 2665

Опубликована: Янв. 1, 2024

By incorporating an acceptor Y-TNF with a structure analogous to Y6 as the third component, nanofiber of active layer is further optimized, molecular arrangement more ordered, and PCE device reaches 18.1%.

Язык: Английский

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Boosting light harvesting of quaternary polymer solar cells through co-donor and co-acceptor with amine-functionalized graphene quantum dots and a ruthenium-based sensitizer

Colloids and Surfaces A Physicochemical and Engineering Aspects, Год журнала: 2024, Номер unknown, С. 135859 - 135859

Опубликована: Ноя. 1, 2024

Язык: Английский

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Computational evolution of high-performing unfused non-fullerene acceptors for organic solar cells

The Journal of Chemical Physics, Год журнала: 2022, Номер 156(17)

Опубликована: Апрель 15, 2022

Materials optimization for organic solar cells (OSCs) is a highly active field, with many approaches using empirical experimental synthesis, computational brute force to screen subset of chemical space, or generative machine learning methods that often require significant training sets. While these may find high-performing materials, they can be inefficient and time-consuming. Genetic algorithms (GAs) are an alternative approach, allowing the "virtual synthesis" molecules prediction their "fitness" some property, new candidates suggested based on good characteristics previously generated molecules. In this work, GA used discover unfused non-fullerene acceptors (NFAs) power conversion efficiency (PCE) provides design rules future work. The electron-withdrawing/donating strength, as well sequence symmetry, those units examined. utilization over brute-force approach resulted in speedups up 1.8 × 1012. New types units, not frequently seen OSCs, suggested, total 5426 NFAs discovered GA. Of these, 1087 predicted have PCE greater than 18%, which roughly current record efficiency. symmetry showed no correlation PCE, analysis arrangement revealed higher performance achieved donor core acceptor end groups. Future NFA designs should consider strategy A-D-A'-D-A architecture.

Язык: Английский

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High-Efficiency Ternary Organic Solar Cells Enabled by Synergizing Dicyanomethylene-Functionalized Coumarin Donors and Fullerene-Free Acceptors

ACS Applied Energy Materials, Год журнала: 2022, Номер 5(7), С. 9020 - 9030

Опубликована: Июль 11, 2022

The small-molecule-based donor/acceptor blend is an important component in bulk-heterojunction organic solar cells (OSCs). Although a variety of small-molecule donors have been developed recent years, only few them reached efficiencies over 15% using fullerene-free acceptors OSCs. Therefore, it to develop high-performing molecular donor materials with ideal orbital energy levels, complementary absorption the acceptors, and good charge-transporting character. Herein, design development two wide band gap functional coumarin-based C1-CN C2-CN are presented, which synthesized efficiently readily accessible starting materials, criterion for realization cost-effective large area associated effect excellent optoelectronic thermal properties frontier levels enabled application solution-processed Ternary OSCs fabricated C1-CN:DBTBT-IC:Y6 displayed up 15.28%, one highest values reported all-small-molecule low loss 0.43 eV.

Язык: Английский

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