Chromium–niobium co-doped vanadium dioxide films: Large temperature coefficient of resistance and practically no thermal hysteresis of the metal–insulator transition

Abstract

We investigated the effects of chromium (Cr) and niobium (Nb) co-doping on the temperature coefficient of resistance (TCR) and the thermal hysteresis of the metal–insulator transition of vanadium dioxide (VO2) films. We determined the TCR and thermal-hysteresis-width diagram of the V1−x−yCrxNbyO2 films by electrical-transport measurements and we found that the doping conditions x ≳ y and x + y ≥ 0.1 are appropriate for simultaneously realizing a large TCR value and an absence of thermal hysteresis in the films. By using these findings, we developed a V0.90Cr0.06Nb0.04O2 film grown on a TiO2-buffered SiO2/Si substrate that showed practically no thermal hysteresis while retaining a large TCR of 11.9%/K. This study has potential applications in the development of VO2-based uncooled bolometers.

Tuning the hysteresis of a metal-insulator transition via lattice compatibility

“…5c 3 and 5 K for the V 1− x W x O 2 / c -Al 2 O 3 sample and the V 1− x W x O 2 /Si sample, respectively) obtained in this single-element-substitution composition spread is not necessarily a universal minimum in doped VO 2 samples. In fact, Miyazaki et al have obtained a hysteresis width as small as 0.6 K using both Cr and Nb to substitute V 51 . According to reported phase diagrams 39 , 46 of VO 2 , W or Nb substitution leads to a reduction effect and also an increase in the lattice constant, and in comparison, using Cr to substitute V leads to an oxidation effect and also a decrease in the lattice constant.…”

One-step hydrothermal synthesis of rare earth/W-codoped VO2 nanoparticles: Reduced phase transition temperature and improved thermochromic properties

“…In recent studies, it was reported that Mg/W-codoping could exhibit low τ c and enhanced T lum / ΔT sol by combining the advantages of Mg and W doping in T lum increasing and τ c reducing respectively [37] and W/F-codoped VO 2 thin films could also show the reduced τ c and improved visible transmittance [43]. Besides, the Cr/Nb-codoping was reported to be helpful in achieving the large TCR (temperature coefficient of resistance) with no thermal hysteresis [44]. Therefore, codoping may be a promising approach to optimize the thermochromic performance of VO 2 smart windows.…”

Metal-insulator transition (MIT) materials for biomedical applications

“…At this temperature, TCR value is in the range of 10-70%. 8,17 and the maximum detection voltage is about 3.73V for 1mK change in temperature. For a gain value of 1000 and TCR=5.0%, we can achieve 0.25V/mK sensitivity using our device.…”

“…By chromium and niobium co-doping, TCR can be increased to 11.9%/°C with practically no thermal hysteresis. 8 Strelcov et al, 9 proposed and tested a novel gas sensor using single crystal VO 2 nanowire. 9 Single crystal VO 2 nanowire (VO 2 ) has sharp and superior transition properties.…”