Mn1.56Co0.96Ni0.48O4 (MCN) thin films with 2 μm thickness were deposited on amorphous Al2O3 substrates by Radio Frequency magnetron sputtering at 450℃, films were annealed at 450℃, 600℃ and 750℃ separately. XRD test showed that MCN thin films deposited at 450℃ possess preferential orientation (400). The variable temperature resistivity test revealed the resistivity of MCN films decreases with the annealed temperature increases. Aging testing showed that films grown at 450℃ and annealed at the same temperature had moderate aging coefficient, meanwhile, the films exhibited favorable noise performance. This paper reports a method to prepare MCN thin films with moderate resistivity, favorable aging and noise characteristics at low temperature(450℃), which is expected to be integrated with the silicon process and has great significance for developing MCN thin film linear or focal plane devices.
A thermal sensitive infrared and THz detector was fabricated by a double layered Mn-Co-Ni-O/Mn-Co-Ni-Cu-O films. The Mn-Co-Ni-O material, as one type of transition metal oxides, has long been used as a candidate for thermal sensors or infrared detectors. The resistivity of a most important Mn-Co-Ni-O thin film, Mn1. 96Co0.96Ni0.48O4(MCN) , is about 200 Ω·cm at room temperature, which ranges about 2 orders larger than that of VOx detectors. Therefore, the thickness of a typical squared Mn-Co-Ni-O IR detector should be about 10 μm, which is too large for focal plane arrays applications. To reduce the resistivity of Mn-Co-Ni-O thin film, 1/6 of Co element was replaced by Cu. Meanwhile, a cover layer of MCN film was deposited onto the Mn-Co-Ni-Cu-O film to improve the long term stability. The detector fabricated by the double layered Mn-Co-Ni-O/Mn-Co-Ni-Cu-O films showed large response to blackbody and 170 GHz radiation. The NEP of the detector was estimated to be the order of 10-8 W/Hz0. 5. By applying thermal isolation structure and additional absorption materials, the detection performance can be largely improved by 1-2 orders according to numerical estimation. The double layered Mn-Co-Ni-O film detector shows great potentials in applications in large scale IR detection arrays, and broad-band imaging.
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