Messages

1

General Questions and Answers / multigrid residual error

« on: March 22, 2015, 11:12 »

Hi everyone,
I'm working on graphene tunneling FET. I built the structure in the Builder and used these settings in the Script Generator
New Calculator :
                           GGA, PBE
                           K-points: 1*1*100
                           Possion Solver: multi-grid, A&B (Neumman) C(Dirichlet)
Transmission Spectrum : -2 to 2 ev , 201 points per segments
I ran the simulation but the following  error occurred
"... multigrid residual is greater than required accuracy..."
Could you please help me with this error?
thanks a lot for your consideration.

2

General Questions and Answers / Vertical Transistor

« on: March 8, 2015, 15:55 »

Dear sir,
Could you please help me with simulating Vertical nanotransistors, structures like the one used in this paper
Graphene-based lateral heterostructure
transistors exhibit better intrinsic
performance than graphene-based
vertical transistors as post-CMOS devices   [ DOI: 10.1038/srep06607],

I mean, how can I build such layered structures with the Builder and what setting I must use in the New Calculator ?
Thank you so much for your consideration.