Addition of Low-Molecular-Weight Batches Enhances Charge-Transport Properties of n-Type Polymer Semiconductors
- Authors
- Kim, Donguk; Park, Hyeonjung; Kim, Taemin; Lee, Jin-Woo; Jeong, Dahyun; Kwon, Hyuck-In; Kim, Bumjoon; Kim, Felix Sunjoo
- Issue Date
- Oct-2022
- Publisher
- American Chemical Society
- Citation
- Macromolecules, v.55, no.20, pp 9039 - 9047
- Pages
- 9
- Journal Title
- Macromolecules
- Volume
- 55
- Number
- 20
- Start Page
- 9039
- End Page
- 9047
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/58914
- DOI
- 10.1021/acs.macromol.2c01045
- ISSN
- 0024-9297
1520-5835
- Abstract
- The molecular weight (MW) and its distribution (MW-D) of conjugated polymers are important parameters to obtain desirable properties for organic field-effect transistors. Although the effects of high-MW chains on charge-carrier mobility are well-recognized, the role of low-MW chains has been overlooked. Herein, we investigate the effects of low-MW chains on the electrical properties of naphthalenediimide-based n-type polymers (PNDIs) having different electron-donating units (namely, thiophene, bithiophene, selenophene, and biselenophene). The MW-D of the PNDIs is systematically controlled by blending high- and low-MW batches of PNDIs. The presence of low amounts of low-MW chains universally enhances the field-effect electron mobility in the PNDI systems. We find that the addition of a small amount (3-10% by weight) of a low-MW polymer batch in a high-MW batch improves molecular ordering and reduces energetic disorder by optimizing the size and distribution of highly crystalline domains. As a result, the blend films exhibit ∼1.2-3.8 times higher mobility than the pristine high-MW PNDI films. This study provides new insight into the effects of MW-D on the electrical properties of polymer films and devices.
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