Regulation of High Miscibility for Efficient Charge‐Transport in n‐Doped Conjugated Polymers

Li, Qiyi; Yao, Ze‐Fan; Wu, Hang; Luo, Longfei; Ding, Yifan; Yang, Chi‐Yuan; Wang, Xinyi; Shen, Zhihao; Wang, Jieyu; Pei, Jian

doi:10.1002/anie.202200221

Cited by 27 publications

(24 citation statements)

References 48 publications

(39 reference statements)

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“…Very recently, Pei and co-workers researched in depth the relationship between side-chain branching point and doping efficiency in TAMdoped π-CP F 4 BDPPV systems. 75 They discovered that the larger disorders caused by the farther branching point in sidechains would offer enough space for molecular dopants without damaging the original π-backbone packing and charge transport pathways, as shown in Figure 8b.…”

Section: Electrical Characteristicsmentioning

confidence: 99%

“…In this respect, designing a branching point farther from the πbackbone in alkyl side-chains seem to be more promising for elevating the doping efficiency and carrier density. 75 (3) Carrier mobility (μ) is another crucial factor in determining the TE performance of π-CPs. Extensive studies were focused on designing polymers with high μ in the pristine state, which cannot be necessarily preserved upon chemical doping.…”

Section: Strengthening Thermoelectric Performancementioning

confidence: 99%

Section: Correlating Polymeric Structures With Electrical Characteris...mentioning

confidence: 99%

“…Finally, pNB-TzDP polymer achieved an impressively high σ up to 11.6 S cm –1 and a PF as high as 53.4 μW m –1 K –2 thanks to its three-dimensional conduction channels and excellent capacity for dopant molecules. Very recently, Pei and co-workers researched in depth the relationship between side-chain branching point and doping efficiency in TAM-doped π-CP F 4 BDPPV systems . They discovered that the larger disorders caused by the farther branching point in side-chains would offer enough space for molecular dopants without damaging the original π-backbone packing and charge transport pathways, as shown in Figure b.…”

Section: Correlating Polymeric Structures With Electrical Characteris...mentioning

confidence: 99%

“…Moreover, numerous studies introduced polar side-chains to enhance the miscibility between polymers and dopants for a higher degree of charge transfer, while the carrier mobility was severely deteriorated. In this respect, designing a branching point farther from the π-backbone in alkyl side-chains seem to be more promising for elevating the doping efficiency and carrier density Carrier mobility (μ) is another crucial factor in determining the TE performance of π-CPs.…”

Section: Supplementary Strategies For Strengthening Thermoelectric Pe...mentioning

confidence: 99%

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Strategic Insights into Semiconducting Polymer Thermoelectrics by Leveraging Molecular Structures and Chemical Doping

2022

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Thermoelectric (TE) materials can realize the direct transformation between heat and electricity, thereby facilitating the recycling of waste heat. Semiconducting π-conjugated polymers (π-CPs) have been largely explored as organic TE materials thanks to the facile molecular tunability of their electronic properties, their room-temperature solution-processability, their intrinsic low thermal conductivity, and their outstanding mechanical flexibility. In this Focus Review, we describe two key strategieschemical doping and structural tailoringin polymeric TEs for strengthening TE power factors of π-CPs. First, the doping mechanisms are unraveled by a sequential process of charge transfer and free carrier release, followed by the introduction of various doping methods for enhancing the chemical doping. Second, the design principles for polymeric structures including the π-backbone and side-chain engineering are presented. Third, supplementary strategies such as polymer chain alignment and construction of polymer blends are identified. Finally, the existing prime obstacles to future development are discussed and an outlook on feasible solutions to resolving them is provided.

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Section: Electrical Characteristicsmentioning

confidence: 99%

Section: Strengthening Thermoelectric Performancementioning

confidence: 99%

Section: Correlating Polymeric Structures With Electrical Characteris...mentioning

confidence: 99%

Section: Correlating Polymeric Structures With Electrical Characteris...mentioning

confidence: 99%

Section: Supplementary Strategies For Strengthening Thermoelectric Pe...mentioning

confidence: 99%

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Strategic Insights into Semiconducting Polymer Thermoelectrics by Leveraging Molecular Structures and Chemical Doping

2022

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Effects of Halogenation of Small‐Molecule and Polymeric Acceptors for Efficient Organic Solar Cells

Han

Wang

Zou

et al. 2023

Adv Funct Materials

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Tuning the properties of non-fullerene acceptors (NFAs) through halogenation, including fluorination and chlorination, represents one of the most promising strategies to boost the performance of organic solar cells (OSCs). However, it remains unclear how the F and Cl choice influences the molecular packing and performance between small-molecule and polymeric acceptors. Here, a series of small-molecule and polymeric acceptors with different amounts and types of halogenation is synthesized, and the effects of fluorination and chlorination between small-molecule and polymeric acceptors are investigated. It is found that chlorinated small-molecule acceptors lead to longer exciton diffusion length and better performance compared to the corresponding fluorinated ones, which attributes to their stronger intermolecular packing mode. For polymer acceptors, in contrast, the fluorinated polymers achieve a denser packing mode and better performance, because chlorinated polymers exhibit reduced intrachain conjugation between end group moieties and linker units. This study demonstrates different halogenation effects on the packing modes and performances for small-molecule and polymeric acceptors, which provides important guidance for the molecule design of high-performance acceptors for OSCs.

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Density of States Engineering of n‐Doped Conjugated Polymers for High Charge Transport Performances

Wang

et al. 2023

Advanced Materials

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Charge transport of conjugated polymers in functional devices closely relates to their density of states (DOS) distributions. However, systemic DOS engineering for conjugated polymers is challenging due to the lack of modulated methods and the unclear relationship between DOS and electrical properties. Here, the DOS distribution of conjugated polymers is engineered to enhance their electrical performances. The DOS distributions of polymer films are tailored using three processing solvents with different Hansen solubility parameters. The highest n‐type electrical conductivity (39 ± 3 S cm−1), the highest power factor (63 ± 11 µW m−1 K−2), and the highest Hall mobility (0.14 ± 0.02 cm2 V−1 s−1) of the polymer (FBDPPV‐OEG) are obtained in three films with three various DOS distributions, respectively. Through theoretical and experimental exploration, it is revealed that the carrier concentration and transport property of conjugated polymers can be efficiently controlled by DOS engineering, paving the way for rationally fabricating organic semiconductors.

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Regulation of High Miscibility for Efficient Charge‐Transport in n‐Doped Conjugated Polymers

Cited by 27 publications

References 48 publications

Strategic Insights into Semiconducting Polymer Thermoelectrics by Leveraging Molecular Structures and Chemical Doping

Strategic Insights into Semiconducting Polymer Thermoelectrics by Leveraging Molecular Structures and Chemical Doping

Effects of Halogenation of Small‐Molecule and Polymeric Acceptors for Efficient Organic Solar Cells

Density of States Engineering of n‐Doped Conjugated Polymers for High Charge Transport Performances

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