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Shin, Tae Joo
Synchrotron Radiation Research Lab.
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Density Functional Theory-Based Approach For Dielectric Constant Estimation of Soluble Polyimide Insulators

Author(s)
Park, HyunjinChoi, HyukKim, JongseokYoo, SungmiMun, Hyun JungShin, Tae JooWon, Jong ChanKim, Hyun YouKim, Yun Ho
Issued Date
2024-03
DOI
10.1021/acs.jpcb.3c07296
URI
https://scholarworks.unist.ac.kr/handle/201301/81976
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.128, no.10, pp.2528 - 2536
Abstract
Evaluation of the insulating properties of polymers, such as the dielectric constant and dissipation factor, is crucial in electronic devices, including field-effect transistors and wireless communication applications. This study applies density functional theory (DFT) to predict the dielectric constant of soluble polyimides (SPIs). Various SPIs containing trifluoromethyl groups in the backbone with different pendant types, numbers, and symmetries are successfully synthesized, and their dielectric constants are evaluated and compared with the DFT-estimated values. Two types of DFT-optimized SPIs, single-chain and stacked-chain models, are used to describe the local geometries of the SPIs. In addition, to reveal the relationship between the molecular structure and dielectric constant, further investigations are conducted by considering the dielectric constant of composing ionic and electronic components. The DFT-estimated static dielectric constant of the single-chain model accurately reproduces the corresponding experimental value with at least 80% accuracy. Our approach provides a rational and accelerated strategy to evaluate polymer insulators for electronic devices based on cost-effective DFT calculations.
Publisher
AMER CHEMICAL SOC
ISSN
1520-6106
Keyword
THIN-FILM TRANSISTORSFIELD-EFFECT TRANSISTORSFLUORINEPERMITTIVITYMECHANISMSPHONONS

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