Abstract
Thermochromic properties of polycrystalline molybdenum doped vanadium pentoxide thin films grown by the spray pyrolysis technique were investigated. Tetragonal thin film structures of this system are grown. The transmittance spectral analysis with temperature indicates a record semiconductor-metal transition temperature of < 50oC. This critical temperature is approximately 1/3 to 1/6 of magnitude expected for V2O5 thin films. The resistance of the thermochromic thin film also underwent a transition or phase change as expected, a reduction from more than few mega ohms to less than kilo ohm regime indicating potential applications in optoelectronics.
Highlights
Thermochromic process is seen in a large number of compounds.[1,4] Thermochromic (TC)materials reversibly change their color with temperature
For the doped thin film samples X-ray diffractions (XRD) peak patterns seem to be developing at around 27◦ and 29◦ belonging to VO2 tetragonal structure
The optical properties of vanadium oxide thin films are sensitive to temperature
Summary
Thermochromic process is seen in a large number of compounds.[1,4] Thermochromic (TC). Considering that undoped V2O5 and Mo-doped V2O5 are semiconductor and n-type semiconductor respectively, the transition process is SMT. These materials could be semi-conductor compounds, liquid crystals or metal compounds. Blum et al reported that V2O5 (001) single crystal surface undergoes a reversible transition at 77–127 ◦C They argued that this transition is limited to the surface layer, because bulk V2O5 does not exhibit the transition. This transition makes V2O5 thin films a promising material for various applications, such as optical and electrical switching, thermochromic devices, and thermal sensors.[6,7]. V2O5 could become a promising candidate for TC applications or TC windows, with record low semiconductor -metal transition temperature
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