I am working on Low temp. schottky diodes. It is the extended work of my recent publication " The influence of antimony doping on I–V, C–V-f and (G/w)-V-f characteristics of indium/ SbXW1-XSe2 (X=0, 0.1, 0.5) alloy Schottky diodes".
Normally, ln(I0/T2)-1000/T have negative slope , but i got positive slope in one case. can it be possible??
Hi Abhishek B Patel ,
the short answer: for a standard (and thermally stable!) Schottky diode: no. I0 is usually determined by thermionic currents, and these increase with temperature.
There something I would suggest you check: Do a temperature cycle, i.e. measure your IV while going first up and then down again in temperature, and see if the values of the fitting parameters are the same for both directions. If they're not, you might have a degradation of the diode during the scan going on, or maybe the temperature you set (and likely also measure somewhere) is not the actual temperature of the device.
If that is not the problem, you might also consider the possibility that your diode is not actually showing thermionic emission. The upward bowing of your Richardson plot looks a bit like there is some deviation from that theory (it's not a straight line, at least there is some change at low temperatures). I do not know that semiconductor, but you may have additional processes like tunneling becoming important at lower temperatures when the semiconductor doping is high, or you have some shunts that you misinterpret as diode currents in your fits. Could you maybe show some IV characteristics of a case where you get the positive slope?
Sir Robert Karsthof ,
I got one research article i can share with you for the same....Fig. 5 have same characteristics after some range of temperature.
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