Fabrication of Bi-La-Sr-Mn-O uncooled microbolometer

Ken Ichi Hayashi, Eiji Ohta, Hideo Wada, Hiroko Higuma, Shoji Miyashita

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Since perovskite manganese oxide Bi-La-Sr-Mn-O (BLSMO) has a large temperature coefficient of resistance (TCR: defined as 1/R dR/dT) of above 3%/K, it has been considered to be a suitable candidate for use as an uncooled IR bolometer material. We fabricated a single pixel device of the BLSMO microbolometer and evaluated it. The BLSMO film was deposited by RF magnetron sputtering at ambient temperature in an oxygen atmosphere. The film showed the TCR of 3.1%/K at room temperature. The size of the single pixel device is 38 × 38 μm2. To achieve high infrared absorption, the detector contains an infrared absorbing membrane with a high fill factor of 90%. In a vacuum, the detector showed a thermal conductance of 1.3 × 10-7 W/K and a responsivity of 4.8 × 105 V/W. According to these numerical values, a noise equivalent temperature difference (NETD) of the BLSMO microbolometer was estimated as being about 0.1 K with f/1.0 optics.

Original languageEnglish
Pages (from-to)5281-5284
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number9 A
Publication statusPublished - 2001 Sept


  • Lanthanum manganite
  • Microbolometer
  • Noise equivalent temperature difference
  • Temperature coefficient of resistance
  • Uncooled infrared detector

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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