Improving the hole mobility of conjugated semiconducting polymer films by fast backbone aggregation during the film formation process

Jin, Tianya; Li, Jichen; Li, Hongxiang; Liu, Xinyu; Li, Junhang; Zhang, Qiang; Yu, Xinhong; Duan, Xiaozheng; Han, Yanchun

doi:10.1039/d4tc00148f

J. Mater. Chem. C

2024

DOI: 10.1039/d4tc00148f

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Improving the hole mobility of conjugated semiconducting polymer films by fast backbone aggregation during the film formation process

Tianya Jin,

Jichen Li,

Hongxiang Li

et al.

Abstract: How to increase the carrier mobility of Donor-acceptor (D-A) conjugated polymer semiconductor film has always been a hot topic in the field of organic electronics. The aggregations via π-π interaction...

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Cited by 3 publications

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Deformation mechanism of conjugated polymer films during single and cyclic stretching

Zhang,

Liu,

et al. 2024

Polymer

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Deformation mechanism of conjugated polymer films during single and cyclic stretching

Zhang,

Liu,

et al. 2024

Polymer

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Introducing Noncovalent Interactions in Conjugated Polymers to Enhance Backbone Coplanarity and Aggregation at the Interface to Improve Carrier Mobility

Liu,

Chen,

et al. 2024

ACS Appl. Mater. Interfaces

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In organic field-effect transistors (OFETs), the high carrier mobility of conjugated polymers (CPs) is significantly influenced by the maintenance of excellent coplanarity and aggregation, especially at the interface between the organic semiconductor and dielectric layer. Unfortunately, CPs typically exhibit poor coplanarity due to the single bond rotations between donor and acceptor units. Furthermore, there is relatively little research on the coplanarity of CPs at the interface. Herein, we propose a strategy of introducing noncovalent interactions to enhance the coplanarity of the backbone and promote the aggregation of the polymer at the interface, which should lead to significant enhancements in carrier mobility. The idea is proved by incorporating different volume fractions of oleic acid (OA) into poly(indacenodithiophene-cobenzothiadiazole) (IDTBT). OA can form hydrogen bonds, which has been verified by Fourier transform infrared spectroscopy (FT-IR). OA promotes the migration of IDTBT toward the interface, thereby enhancing aggregation, as verified by film-depth-dependent light absorption spectroscopy (FLAS) and contact angle (CA) experiments. The results from film-depth-dependent Raman spectroscopy (FRS), twodimensional grazing incidence wide-angle X-ray scattering (2D GIWAXS), atomic force microscopy (AFM), and density functional theory (DFT) calculations suggest that films treated with OA exhibit enhanced backbone coplanarity and aggregation at the interface, resulting in an increase in carrier mobility to 4.24 ± 0.11 cm 2 V −1 s −1 with the addition of OA.

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Increasing the Content of Edge-On Orientation to Improve the Hole Mobility of IDTBT Film by the van der Waals Interaction between the Side Chain and Alkane Additives

Jin,

Li,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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The molecular orientation in the conjugated polymer film critically impacts the performance of organic electronic devices. As for organic field-effect transistors (OFETs), the edge-on orientation is beneficial for efficient interchain charge transport. However, for the near amorphous indacenodithiophene-co-benzothiadiazole (IDTBT) film, the face-on orientation was dominated in the drop cast thin film. Herein, we proposed a strategy to increase the edge-on orientation in IDTBT films by inserting n-hexadecane (16C) additives with a high boiling point between the side chains. Because the 16C additives had a similar structure to that of the side chain, the 16C additives were distributed around the side chain in the nucleation stage. Then, the backbone aggregated quickly with the nuclei formation speed (k) nearly twice as high as that without the 16C additives. In the growth stage, some face-on nuclei turned to edge-on nuclei due to the van der Waals interactions between the side chain and 16C additives. This was verified by the results of in situ GIWAXS, where the intensity of (010) decreased and the intensity of (100) increased in the out-of-plane direction. The edge-on orientation content of the film with 16C additives reached 57%, higher than that of the neat film (33%). Moreover, compared to the neat IDTBT film, the lamellar packing distance of the film with 16C additives increased the lamellar packing distance from 16.97 to 23.26 Å and the π−π stacking distance decreased from 4.36 to 4.19 Å. The hole mobility of the film with 16C additives (3.24 ± 0.19 cm 2 V −1 s −1 ) was higher than that of the neat film (0.94 ± 0.07 cm 2 V −1 s −1 ).

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Improving the hole mobility of conjugated semiconducting polymer films by fast backbone aggregation during the film formation process

Abstract: How to increase the carrier mobility of Donor-acceptor (D-A) conjugated polymer semiconductor film has always been a hot topic in the field of organic electronics. The aggregations via π-π interaction...

Cited by 3 publications

References 72 publications

Deformation mechanism of conjugated polymer films during single and cyclic stretching

Deformation mechanism of conjugated polymer films during single and cyclic stretching

Introducing Noncovalent Interactions in Conjugated Polymers to Enhance Backbone Coplanarity and Aggregation at the Interface to Improve Carrier Mobility

Increasing the Content of Edge-On Orientation to Improve the Hole Mobility of IDTBT Film by the van der Waals Interaction between the Side Chain and Alkane Additives

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