Low-Cost and High-Performance Polymer Solar Cells with Efficiency Insensitive to Active Layer Thickness

Kong, Xiaolei; Zhang, Jinyuan; Li, Meng; Sun, Chenkai; Jiang, Xin; Zhang, Jianqi; Zhu, Chen; Sun, Guangpei; Li, Jing; Li, Xiaojun; Wei, Zhixiang; Li, Yongfang

doi:10.31635/ccschem.023.202202720

Cited by 27 publications

(27 citation statements)

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“…The side chains in NFAs can be categorized into two classes: the inner versus outer side chains. 30,31 The first group plays a critical role in the solubility of the molecules and molecular packing. 1,30 Long side chains are preferred to improve the solubility 1,32,33 though an excessive length can promote a large separation of the conjugated cores in the solid phase, which constitutes an obstacle for charge transport between molecules.…”

Section: Introductionmentioning

confidence: 99%

The impact of side chain elongation from the Y6 to Y6-12 acceptor in organic solar cells: a fundamental study from molecules to devices

et al. 2023

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Section: Introductionmentioning

confidence: 99%

The impact of side chain elongation from the Y6 to Y6-12 acceptor in organic solar cells: a fundamental study from molecules to devices

et al. 2023

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“…To date, appreciable PCEs over 18.5% have been recorded using polymer donor and fullerene‐free acceptors (FFAs) for a binary device. [ 8,9 ] The development of A–D–A structured fused‐ring electron acceptors, such as ITIC and Y6, brought a major outbreak by providing the highest PCEs, up to 19%. [ 10–12 ] The innovation of small molecule‐based donor material with superior advantages of facile synthesis, high purity, structural variability, and reproducibility could be capable of solving the issues associated with polymeric molecules, including synthesis, high cost, and complicated molecular structures.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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

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“…[ 18–21 ] Hence, despite the better repeatability without batch‐to‐batch problems, the photovoltaic performance of SM‐OSCs lags behind that of the PSCs. [ 14,22–24 ] Therefore, achieving desirable phase‐separated morphology, which could enable efficient exciton dissociation and charge carrier transport and suppress the charge recombination of small molecule blend films, becomes the main strategy to improve the photovoltaic performance of the SM‐OSCs. [ 25,26 ]…”

Section: Introductionmentioning

confidence: 99%

Miscibility Regulation and Thermal Annealing Induced Hierarchical Morphology Enables High‐Efficiency All‐Small‐Molecule Organic Solar Cells Over 17%

Guo

Qiu

Xia

et al. 2023

Advanced Energy Materials

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Achieving an ideal morphology to realize efficient charge generation and transport is an imperative avenue to improve the photovoltaic performance of all small‐molecule organic solar cells (SM‐OSCs). Here, ternary SM‐OSCs are fabricated based on a new small molecule donor, SM‐mB, and an alloyed blend acceptor of Y6 and its derivative, L8‐BO, and desirable hierarchical morphology with appropriate nanoscale phase separation is successfully realized through adjusting the thermal annealing treatment conditions and compositions of mixed acceptors in the active layer. Then the ternary SM‐OSCs achieve an excellent PCE of 17.06 %, which is one of the best results for the SM‐OSCs so far. The desirable morphology can be ascribed to the optimization of the miscibility‐driven donor and acceptor blend morphology that takes full advantage of the individual advantages of both acceptors, which facilitate efficient charge generation and extraction with more balanced charge carrier mobilities. More importantly, the photovoltaic performance of the ternary SM‐OSCs possesses a high tolerance to the device fabrication conditions, including thermal annealing treatment, and is insensitive to film thickness, which is beneficial for large‐area manufacture and future practical applications.

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Low-Cost and High-Performance Polymer Solar Cells with Efficiency Insensitive to Active Layer Thickness

Cited by 27 publications

References 0 publications

The impact of side chain elongation from the Y6 to Y6-12 acceptor in organic solar cells: a fundamental study from molecules to devices

The impact of side chain elongation from the Y6 to Y6-12 acceptor in organic solar cells: a fundamental study from molecules to devices

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

Miscibility Regulation and Thermal Annealing Induced Hierarchical Morphology Enables High‐Efficiency All‐Small‐Molecule Organic Solar Cells Over 17%

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