Hyperbranched Perylene Diimide Polymers as Electron Transport Layers for Efficient Organic Solar Cells

Xia, Dongdong; Chen, Xiang; Fang, Jie; Xie, Qian; Jiang, Xudong; Zhang, Yuefeng; Li, Caifang; Hu, Zhiyun; Wan, Liying; You, Shengyong; Li, Weiwei; Zhao, Chaowei

doi:10.1021/acs.macromol.3c01740

“…The 2D charge transport channel, the cascade energy levels and the good miscibility make SD‐EDOT an excellent candidate as the third component for T‐OSCs. We constructed OSCs with the configuration of ITO/PEDOT : PSS/PM6 : L8‐BO : SD‐T (or SD‐EDOT)/HPDIN‐B02/Ag, where the HPDIN‐B02 was used as electron transport layer materials [77] and the 1,3‐dibromo‐5‐chlorobenzene (DBCl) was selected as solid additive [78] . We performed the detailed optimization of solar cells by varying the ratio of donor to acceptor and the third component to obtain the optimal performance (Figure S9, Tables S7 and S8).…”

Section: Resultsmentioning

confidence: 99%

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Xie,

Deng,

Zhao

et al. 2024

Angew Chem Int Ed

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Ternary organic solar cells (T‐OSCs) represent an efficient strategy for enhancing the performance of OSCs. Presently, the majority of high‐performance T‐OSCs incorporates well‐established Y‐acceptors or donor polymers as the third component. In this study, a novel class of conjugated small molecules has been introduced as the third component, demonstrating exceptional photovoltaic performance in T‐OSCs. This innovative molecule comprises ethylenedioxythiophene (EDOT) bridge and 3‐ethylrhodanine as the end group, with the EDOT unit facilitating the creation of multiple conformation locks. Consequently, the EDOT‐based molecule exhibits two‐dimensional charge transport, distinguishing it from the thiophene‐bridged small molecule, which displays fewer conformation locks and provides one‐dimensional charge transport. Furthermore, the robust electron‐donating nature of EDOT imparts the small molecule with cascade energy levels relative to the electron donor and acceptor. As a result, OSCs incorporating the EDOT‐based small molecule as the third component demonstrate enhanced mobilities, yielding a remarkable efficiency of 19.3%, surpassing the efficiency of 18.7% observed for OSCs incorporating thiophene‐based small molecule as the third component. The investigations in this study underscore the excellence of EDOT as a building block for constructing conjugated materials with multiple conformation locks and high charge carrier mobilities, thereby contributing to elevated photovoltaic performance in OSCs.

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Pre‐Endcapping of Hyperbranched Polymers toward Intrinsically Stretchable Semiconductors with Good Ductility and Carrier Mobility

Zhou,

Luo,

Cui

et al. 2024

Advanced Materials

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The advancement of semiconducting polymers stands as a pivotal milestone in the quest to realize wearable electronics. Nonetheless, endowing semiconductor polymers with stretchability without compromising their carrier mobility remains a formidable challenge. This study proposes a “pre‐endcapping” strategy for synthesizing hyperbranched semiconducting polymers (HBSPs), aiming to achieve the balance between carrier mobility and stretchability for organic electronics. The findings unveil that the aggregates formed by the endcapped hyperbranched network structure not only ensure efficient charge transport, but also demonstrate superior tensile resistance. In comparison to linear conjugated polymers, HBSPs exhibit substantially larger crack onset strains and notably diminished tensile moduli. It is evident that the HBSPs surpass their linear counterparts in terms of both their semiconducting and mechanical properties. Among HBSPs, HBSP‐72h‐2.5 stands out as the preeminent candidate within the field of inherently stretchable semiconducting polymers, maintaining 93% of its initial mobility even when subjected to 100% strain (1.41±0.206 cm2V−1s−1). Furthermore, thin film devices of HBSP‐72h‐2.5 remain stable after undergoing repeated stretching and releasing cycles. Notably, the mobilities are independent of the stretching directions, showing isotropic charge transport behavior. The preliminary study makes this “pre‐endcapping” strategy a potential candidate for future design of organic materials for flexible electronic devices.This article is protected by copyright. All rights reserved

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Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Xie,

Deng,

Zhao

et al. 2024

Angewandte Chemie

Self Cite

0

View full text Add to dashboard Cite

Ternary organic solar cells (T‐OSCs) represent an efficient strategy for enhancing the performance of OSCs. Presently, the majority of high‐performance T‐OSCs incorporates well‐established Y‐acceptors or donor polymers as the third component. In this study, a novel class of conjugated small molecules has been introduced as the third component, demonstrating exceptional photovoltaic performance in T‐OSCs. This innovative molecule comprises ethylenedioxythiophene (EDOT) bridge and 3‐ethylrhodanine as the end group, with the EDOT unit facilitating the creation of multiple conformation locks. Consequently, the EDOT‐based molecule exhibits two‐dimensional charge transport, distinguishing it from the thiophene‐bridged small molecule, which displays fewer conformation locks and provides one‐dimensional charge transport. Furthermore, the robust electron‐donating nature of EDOT imparts the small molecule with cascade energy levels relative to the electron donor and acceptor. As a result, OSCs incorporating the EDOT‐based small molecule as the third component demonstrate enhanced mobilities, yielding a remarkable efficiency of 19.3%, surpassing the efficiency of 18.7% observed for OSCs incorporating thiophene‐based small molecule as the third component. The investigations in this study underscore the excellence of EDOT as a building block for constructing conjugated materials with multiple conformation locks and high charge carrier mobilities, thereby contributing to elevated photovoltaic performance in OSCs.

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Hyperbranched Perylene Diimide Polymers as Electron Transport Layers for Efficient Organic Solar Cells

Cited by 4 publications

References 57 publications

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Pre‐Endcapping of Hyperbranched Polymers toward Intrinsically Stretchable Semiconductors with Good Ductility and Carrier Mobility

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

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