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

Miyazaki, Kenichi  ,  Shibuya, Keisuke  ,  Suzuki, Megumi  ,  Sakai, Kenichi  ,  Fujita, Jun-ichi  ,  Sawa, Akihito

6 ( 5 )  , p.055012 , 2016-05 , American Institute of Physics
ISSN:2158-3226
Description
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−yCrxNbyO2films 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 V0.90Cr0.06Nb0.04O2filmgrown 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.
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