Author Topic: I-V curve of DTB device  (Read 3015 times)

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Offline OMG123

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I-V curve of DTB device
« on: May 21, 2012, 03:18 »
I redid the calculation of transmission spectrum and I-V curve illustrated in Fig2 and Fig4 in ' Comp. Mat. Sci. 27, 151 (2003) '
The parameter setting is followed by tutorial 'Molecular Devices' except for k-point sampling. I set (1,1,50) instead of (3,3,50).
As we calculated I-V curve of DTB device, our result couldn't match the result in paper at voltage higher than 4 Volt.
I guessed it due to iteration tolerance because I reduced iteration tolerance to 0.05 at higher bias. However, I didn't found
the exact problem, so I need some advises from you.
thanks you

Offline kstokbro

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Re: I-V curve of DTB device
« Reply #1 on: May 21, 2012, 15:46 »
Difficult to determine what is the exact reason. The geometries are also not exactly the same, and I do not have the old geometry.
It is  important that you have a fine mesh for:
DoubleContourIntegralParameters(
real_axis_point_density )
thus, you might try lowering this value, and check convergence.

However, I would not be concerned about what is going on at 4 V bias, this is a very high bias of no experimental importance.