Can anyone suggest proved method to activate electrical conductivity of metal oxides thin film?
Transition metal oxides are good semiconductors. Putting the material into a reducing environment at elevated temperature will create defects on the oxide lattice. This increases the conductivity. There is a great book on the topic from 1972 by Per Kofstad. See
https://books.google.com/books/about/Nonstoichiometry_diffusion_and_electrica.html?id=QFIvAQAAIAAJ
I extended the work to multi-component metal oxides with good success. You will see beautiful color due to the bandgap introduced from doping and defect generation.
Hi Akram, I suggest to use laser annealing via (excimer or second harmonic generation SHG (diode laser 532nm)) or thermally by oven.
Thank you Shams Ali. I tried thermal annealing by oven, but doesn't workout. Thus for laser annealing at which atmosphere ?
Thank you Muhammad Sultan Irshad. In this case the electrical conductivity will be due to silver nanoparticle not from metal oxide thin film!. Or did you mean special type of doping, maybe you can explain more.
Hi Akram,
In my previous work I used (532 and 650)nm lasers under atmosphere (room conditions), but you have to be awared the laser intensity and can reduce that by using beam expander!
Hi Shams,
Thanks i will try it. Just for more clarification, did you mean your film was insulating, and when you annealed under this condition it became electrical conductive?
Transition metal oxides are good semiconductors. Putting the material into a reducing environment at elevated temperature will create defects on the oxide lattice. This increases the conductivity. There is a great book on the topic from 1972 by Per Kofstad. See
https://books.google.com/books/about/Nonstoichiometry_diffusion_and_electrica.html?id=QFIvAQAAIAAJ
I extended the work to multi-component metal oxides with good success. You will see beautiful color due to the bandgap introduced from doping and defect generation.
I would ad to the very useful information provided by Prof. Bickmore that the effects of hydrogen or small ions intercalation, etc. in transition metal oxides have been intensively studied as electrochromic, gasochromic, photochromic and thermochromic effects.
Thank you Dr. Daniela Gogova. I already tried this approach yes sure there are changing in color, but still not conductive!.
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