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Scalable Ultrathin All-Organic Polymer Dielectric Films for High-Temperature Capacitive Energy Storage.
- Source :
-
Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2022 Nov; Vol. 34 (47), pp. e2207421. Date of Electronic Publication: 2022 Oct 25. - Publication Year :
- 2022
-
Abstract
- The miniaturization of electronic devices and power systems for capacitive energy storage under harsh environments requires scalable high-quality ultrathin high-temperature dielectric films. To meet the need, ultrasonic spray-coating (USC) can be used. Novel polyimides with a dipolar group, CF <subscript>3</subscript> (F-PI), and all-organic composites with trace organic semiconductor can serve as models. These scalable high-quality ultrathin films (≈2.6 and ≈5.2 µm) are successfully fabricated via USC. The high quality of the films is evaluated from the micro-millimeter scale to the sub-millimeter and above. The high glass transition temperature T <subscript>g</subscript> (≈340 °C) and concurrent large bandgap E <subscript>g</subscript> (≈3.53 eV) induced by weak conjugation from considerable interchain distance (≈6.2 Å) enable F-PI to be an excellent matrix delivering a discharge energy density with 90% discharge efficiency U <subscript>η90</subscript> of 2.85 J cm <superscript>-3</superscript> at 200 °C. Further, the incorporation of a trace organic semiconductor leads to a record U <subscript>η90</subscript> of ≈4.39 J cm <superscript>-3</superscript> at 200 °C due to the markedly enhanced breakdown strength caused by deep charge traps of ≈2 eV. Also, a USC-fabricated multilayer F-PI foil capacitor with ≈85 nF (six layers) has good performance at 150 °C. These results confirm that USC is an excellent technology to fabricate high-quality ultrathin dielectric films and capacitors.<br /> (© 2022 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-4095
- Volume :
- 34
- Issue :
- 47
- Database :
- MEDLINE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 36210753
- Full Text :
- https://doi.org/10.1002/adma.202207421