Effect of microstructure on electrical properties of thin film alumina capacitor with metal electrode

Myung Sun Jeong, Byeong Kwon Ju, Young Jei Oh, Jeon Kook Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The power capacitors used as vehicle inverters must have a small size, high capacitance, high voltage, fast response and wide operating temperature. Our thin film capacitor was fabricated by alumina layers as a dielectric material and a metal electrode instead of a liquid electrolyte in an aluminum electrolytic capacitor. We analyzed the micro structures and the electrical properties of the thin film capacitors fabricated by nano-channel alumina and metal electrodes. The metal electrode was filled into the alumina nano-channel by electroless nickel plating with polyethylene glycol and a palladium catalyst. The spherical metals were formed inside the alumina nano pores. The breakdown voltage and leakage current increased by the chemical reaction of the alumina layer and PdCl2 solution. The thickness of the electroless plated nickel layer was 300 nm. We observed the nano pores in the interface between the alumina layer and the metal electrode. The alumina capacitors with nickel electrodes had a capacitance density of 100 nF/cm2, dielectric loss of 0.01, breakdown voltage of 0.7MV/cm and leakage current of 104 μA.

Original languageEnglish
Pages (from-to)309-313
Number of pages5
JournalKorean Journal of Materials Research
Volume21
Issue number6
DOIs
Publication statusPublished - 2011

Keywords

  • Alumina film capacitor
  • Alumina nano structure
  • Electroless Ni plating
  • Palladium
  • Polyethylene glycol

ASJC Scopus subject areas

  • Materials Science(all)

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