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pn tcad - Getting Started with ISE-TCAD 8.0 Maneesh...

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Getting Started with ISE-TCAD 8.0 Maneesh Shanbhag 02/01/2003 1. You have been assigned a TCAD working directory which can be accessed by typing ece439 at the command prompt of any EWS workstation. Your working directory will be $HOME/ece439.work/ise and contains 20MB of space. 2. The ISE-TCAD design flow is as follows: create device boundaries, doping profiles, and grids using mdraw , edit simulation parameters in des0.cmd , run the simulation using dessis , and finally visualize the results using tecplot and/or inspect . Some of these tools can be run from the command line or from the ISE-TCAD graphical environment. To run the graphical environ- ment, type (case-sensitive): tcad-8.0 & Note: If ’tcad-8.0’ produces an error, run the following: mkdir -p $HOME/ise/solaris and try running ’tcad-8.0’ again. 3. To setup your device geometry and doping, at the command prompt, type: mdraw & Once all mdraw steps are completed, you will have the following files: <filename>.bnd , <filename>.cmd , <filename>_mdr.grd , <filename>_mdr.dat , and <filename>_mdr.log . 4. For our example, we will do a simple pn-diode. Before starting, notice there are two possible environments (bottom left hand box), boundary and doping . We will first define device boundaries and contacts in the boundary environ- ment and then go on to define doping profiles and meshes in the doping environment. Before starting with our example, make sure the box for Exact Coordinates is checked. This makes mdraw confirm the coordinates you have chosen. 1
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Figure 1: Screenshot of MDraw after drawing a rectangle. 5. We will create a 10 μ m × 4 μ m silicon diode. First we choose the material Si from the Materials menu. Then, on the left, click on the Add Rectangle button. In the drawing window, use the mouse to create a rectangle of size 10 by 4. The Dimensions window will now appear (Fig. 1). Enter the exact values you would like. Click OK . 6. We will now add the contacts. Click Add Contact and enter the name of your first contact, we will use cathode . Click on the Set/Unset Contact button. Now, in the drawing window, click on the left-hand boundary of our diode. That line should turn red, indicating that it is now a contact. Repeat this procedure for our anode (right-hand boundary). 7. You can edit your contacts, doping profiles, or refinements at any time from the View menu. 8. Switch to the doping environment. Click on the Add Constant P. button.
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