Today in class I did two activities. First we did a flow chart showing how we go from a pile of sand to a silicon wafer. The second activity was a CMOS sandwich which is shown in the picture. I used the image from figures 3.22 and 3.23 in "Semiconductor Manufacturing Technology" by Michael Quirk as a guide and the students made CMOS sandwiches according to the following guidelines:

1. Bread is the silicon substrate.
2. Ketchup is P-doped silicon
3. Mustard is N-doped silicon
4. Cheese is oxide
5. Meat is metal or polysilicon

They need to remember to put the gate oxide under the gate polysilicon where it contacts the silicon substrate. Also we forgot to put in the interlayer oxide with contact holes. Here is an example of a finished sandwich.

This was a fun activity and makes you really think about the three dimensional structure of the CMOS device. Since our class is near supper time this makes a good activity.

Here is a generic CMOS layout:

Views: 1148


You need to be a member of The International NanoScience Community to add comments!

Join The International NanoScience Community

Welcome - about us

Welcome! Nanopaprika was cooked up by Hungarian chemistry PhD student in 2007. The main idea was to create something more personal than the other nano networks already on the Internet. Community is open to everyone from post-doctorial researchers and professors to students everywhere.

There is only one important assumption: you have to be interested in nano!

Nanopaprika is always looking for new partners, if you have any idea, contact me at

Dr. András Paszternák, founder of Nanopaprika

Next partner events of TINC

We are Media Partner of:

© 2015   Created by András Paszternák, PhD (founder).   Powered by

Badges  |  Report an Issue  |  Terms of Service

Warning: require_once(xn-app://widgetlaboratory/apps/windex.php): failed to open stream: "XN_AppFilesystemStream::stream_open" call failed in /apps/nanoscience/index.php on line 5 Fatal error: require_once(): Failed opening required 'xn-app://widgetlaboratory/apps/windex.php' (include_path='.:/php/includes/XN:/php/includes/PEAR:/php/includes/other') in /apps/nanoscience/index.php on line 5