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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Understanding of Fluorination Dependence on Electron Mobility and Stability of Naphthalenediimide-Based Polymer Transistors in Environment with 100% Relative Humidity

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Title
Understanding of Fluorination Dependence on Electron Mobility and Stability of Naphthalenediimide-Based Polymer Transistors in Environment with 100% Relative Humidity
Author
Cho, YongjoonLee, Hae RangJeong, AyoungLee, JunghoLee, Sang MyeonJoo, Se HunKwak, Sang KyuOh, Joon HakYang, Changduk
Issue Date
2019-10
Publisher
American Chemical Society
Citation
ACS APPLIED MATERIALS & INTERFACES, v.11, no.43, pp.40347 - 40357
Abstract
A family of copolymers (P(NDIOD-T2Fx)) based on naphthalenediimide (NDI) and 2,2′-bithiophene (T2) units with different amounts of 3,3′-difluoro-2,2′-bithiophene (T2F) decoration were synthesized, characterized, and used in n-type organic field-effect transistors (OFETs). With increasing T2F content in the backbone, we observe increased melting and crystallization transitions, blue-shifted absorptions, and deeper-lying highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) levels, together with improved hydrophobicity. The highest electron mobility of 4.48 × 10-1 cm2 V-1 s-1 was obtained for P(NDIOD-T2F0) without a T2F unit, which is attributed to the larger domain grains and crystallites, as well as a more tightly packed and oriented crystalline structure, as evidenced from the morphological study. In contrast, P(NDIOD-T2F100) with the highest T2F content has superior air stability, showing greater than 25% electron mobility retention after 30 days in wet conditions of 100% relative humidity without encapsulation. Even P(NDIOD-T2F100) is able to operate normally after 30 min of immersion in water, which is due to the synergistic contributions from the deep HOMO/LUMO levels and improved hydrophobicity. This study advances our fundamental understanding of how the morphology/crystallinity, device performance, and device stability of n-type copolymers are tuned by incorporating different concentrations of T2F in the backbone, shedding light on an important modification for air- and water-stable n-type materials for future OFET applications.
URI
https://scholarworks.unist.ac.kr/handle/201301/30497
URL
https://pubs.acs.org/doi/10.1021/acsami.9b14942
DOI
10.1021/acsami.9b14942
ISSN
1944-8244
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