Origin of the enhanced electrical characteristics of BaTiO3-based thermistors by sputtered Al and Ni-Cu buffer electrode films

Hong Je Choi, Jin Woo Jang, Myoung Pyo Chun, Yong Soo Cho

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Significant improvements in the characteristics of positive temperature coefficient of resistance for BaTiO3/Ag-based temperature sensors are reported by utilizing buffer electrode films of Al and Ni-Cu. The Ni-Cu buffer layer was more effective in reducing room temperature electrical resistance than the Al layer, which results in a significant increase in the resistance jump ratio. As a promising example, the use of a 541 nm thick Ni-Cu buffer film demonstrated a substantially increased log(Rmax/Rmin) value of 3.15, compared to 1.80 for only the Ag electrode without the buffer layer. Origin of the enhancement by Ni-Cu is attributed due to the improved ohmic behavior with a lowered Schottky barrier potential at the ceramic-electrode interfaces. The thicker layer is preferred regardless of the type of buffer layer since it demonstrates a lower interfacial electrical resistance as confirmed by the impedance analysis.

Original languageEnglish
Pages (from-to)435-439
Number of pages5
JournalCurrent Applied Physics
Volume16
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

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