# Exercise 4.3-1

## Quick Questions to

### 4.3 Infrastructure

| Here are some quick questions:
|  | "Cleanroom class 100" means roughly....?
|  | Describe the effects of particles on, and contamination in a chip.
|  | The electrically crucial area of an integrated transisitor is (50 × 300 ×300) nm3. The lattice constant of Si is roughly 0.5 nm; there are .... atoms per elementary cell. An Au concetration of 1 ppb "kills" the transistor. How many Au atoms can you tolerate in your transistor? If you touch a gold ring and 1 out of 1 billion surface atoms gets stuck on your finger - how many, roughly, are now on your skin?

With frame

4.3.5 Summary to: 4.3 Infrastructure

© H. Föll (Semiconductor Technology - Script)