Yin, Yiming, Zhou, Wei, Jiang, Lin, Zhang, Fei, Tong, Jinchao, Gao, Yanqing, Wu, Jing, and Huang, Zhiming
We prepare undoped Mn 1.5 Co 1 Ni 0.5 O 4 and Cu and Sc co-doped Mn 1.5 Co 1 Ni 0.25 Cu x Sc 0.25−x O 4 (x = 0.05, 0.1, 0.15) films on Al 2 O 3 substrate by chemical solution deposition method. The crystallinity, surface morphologies, electrical transport property, optical property, and 1/ f noise property of these films are characterized. It shows that the Mn 1.5 Co 1 Ni 0.25 Cu 0.15 Sc 0.1 O 4 film possesses excellent electrical transport, optical and 1/ f noise properties compared with the other films. The absolute temperature coefficient of resistance and characteristic temperature of the Mn 1.5 Co 1 Ni 0.25 Cu 0.15 Sc 0.1 O 4 film are higher than that of Mn 1.5 Co 1 Ni 0.5 O 4 film, while its resistivity of 250 Ω·cm at 295 K is half of that Mn 1.5 Co 1 Ni 0.5 O 4 film. The transmittance and reflectance spectra of the films are measured and analyzed in the range of 0.55–2.0 µm, all the films show similar absorption structures in the measured spectrum. The 1/ f noise of the co-doped Mn 1.5 Co 1 Ni 0.5 O 4 films decreases significantly. The (γ/n)0.5/| TCR | value of the Mn 1.5 Co 1 Ni 0.25 Cu 0.15 Sc 0.1 O 4 reaches 2.3 × 10−12 cm1.5 K/% at 295 K, which is two orders lower than that of Mn 1.5 Co 1 Ni 0.5 O 4 film. Our results discover a thermosensitive material with excellent performance, which is expected to be applied to high performance uncooled infrared detectors. • We did a complete and systematic study for the Cu and Sc co-dopants effects on the electrical transport, optical, and low-frequency noise properties of Mn 1.5 Co 1 Ni 0.5 O 4 (MCN) thin films. • Mn 1.5 Co 1 Ni 0.25 Cu 0.15 Sc 0.1 O 4 thin film was found to be excellent electrical transport, optical and low-frequency noise performance, and we investigated and discussed the mechanisms of enhanced performance of the Cu and Sc co-doped MCN films. • The optical and low-frequency noise properties of Cu and Sc Co-doped MCN films were studied for the first time. • This study provides an insight to understand the effects of Cu and Sc co-dopants on Mn 1.5 Co 1 Ni 0.5 O 4 thin films, which has great significance for preparing high-performance uncooled infrared detectors based on MCN films. [ABSTRACT FROM AUTHOR]