Semiconductors ELCT503

Device Simulation using Silvaco

LAB I

Assignment 1

Write a code to simulate a PN junction with cross-sectional area of 1μm2. The donor concentration is

1018

and the acceptor concentration is 1016

. The doping is uniform in both the n-region and the p-

region. The length of the junction is 5 μm.

Plot :

- The net doping in both p-region and n-region

- The energy band diagram of the structure

- The electric charge across the structure

- The electric field across the structure

- The potential across the structure

Then plot the IV characteristics, showing the effect of:

- The doping concentration in both regions

- The area of the junction

On the IV characteristics of the junction

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Hint:

For the plotting of the different quantities above, you would use the following command lines:

After : solve init

use the command :

OUTPUT … …

To save the required quantities such as:

CON.BAND VAL.BAND E.Field etc…

Then save the obtained values in a new file:

save outfile=xxx.sta

then extract the required data :

extract name="xxx xxx" curve(depth, impurity="Net Doping" material="All" x.val=0.5)

outfile="xyz.dat"

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For help, you can refer to user manual or visit:

http://nanohub.org/resources/1595/download/silvaco.pdf