I want to change the size of moscap

[신성현]

Hello,

I want to change the moscap2d.geo file. But I don`t know the meaning of this code. I try to change Tox to 2nm. Please help me.

w=1;

tox=2; 

tsi=60;

trf=tox+8; /*thickness of refinement area*/

tcl0=0.3; /*cl in ox*/

tcl1=0.03; /*cl near interface*/

tcl2=0.3;

tcl3=0.3; /*cl near backside */

Point(1) = {-w/2.0,  -tox, 0, tcl0};

Point(2) = { 0,      -tox, 0, tcl0};

Point(3) = { w/2.0,  -tox, 0, tcl0};

Point(4) = {-w/2.0,    0.0, 0, tcl1};

Point(5) = { 0,        0.0, 0, tcl1};

Point(6) = { w/2.0,    0.0, 0, tcl1};

Point(7) = {-w/2.0,   trf, 0, tcl2};

Point(8) = { w/2.0,   trf, 0, tcl2};

Point(9) =  {-w/2.0,  tsi, 0, tcl3};

Point(11) = { w/2.0,  tsi, 0, tcl3};

Line(1) = {1, 2};

Line(2) = {2, 3};

Line(3) = {1, 4};

Line(4) = {4, 5};

Line(5) = {5, 6};

Line(6) = {3, 6};

Line(7) = {4, 7};

Line(8) = {6, 8};

Line(9) = {8, 11};

Line(10) = {11, 9};

Line(11) = {9, 7};

Physical Line("gate") = {1, 2};

Physical Line("sub") = {10};

Physical Line("interface") = {4, 5};

Line Loop(14) = {1, 2, 6, -5, -4, -3};

Plane Surface(15) = {14};

Line Loop(16) = {7, -11, -10, -9, -8, -5, -4};

Plane Surface(17) = {16};

Physical Surface("oxide") = {15};

Physical Surface("silicon") = {17};

I want to know how to change this code. Thank you for reading this.

Regards,

Shin

[chenq...@gmail.com]

Hi:

 There are several materials about geo file and Gmsh.

 

https://openfoamwiki.net/index.php/2D_Mesh_Tutorial_using_GMSH

Gmsh official instruction:

https://gmsh.info/doc/texinfo/gmsh.html#Geometry

and you can also learn it through video-course from YouTube. 

https://www.youtube.com/results?search_query=Gmsh

 

The first paragraph you pasted is some parameters about the structure. You can change them 

to scale your device.

[신성현]

Hi

I changed tox which is in the first paragraph to 3.5nm. But there`s no change in the result pdf file. Are there other jobs to change parameter I have to?

2021년 3월 9일 화요일 오후 10시 58분 8초 UTC-9에 chenq...@gmail.com님이 작성:

[Juan Sanchez]

Hello,

If you are using this file with:
https://github.com/devsim/devsim_density_gradient

# Edit moscap.geo
# generate moscap2d.msh
gmsh -2 -format msh22 moscap2d.geo
# create moscap2d_devsim.msh
python moscap2d.py
# run example
python test_2d.py

Please let me know if you have any additional questions.

Regards,

Juan

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