# Exercise 3.1-1

## Class Exercises and Quick Questions to

### 3.1 Thin Films - General

| Here are some class exercises and quick questions:
|  | Interference causes the color of a thin film and betrays its thickness? Explain!
|  | Give examples of what "thin" could mean in relation to intrinsic length scales. Provide (and discuss briefly) some intrinsic lengths, in particular with respect to semiconductors
|  | Give a few numbers for the meaning of "thin": Thickness of a human hair »» ???? Thickness of a gate oxide in an integrated transistor »» ???? Thickness of antireflection layers of optical lenses »» ???? Thickness of a thin film solar cell »» ???? Other examples you can come up with ???
|  | Give some examples of thin film applications outside of semiconductor technology.
|  | Give the equation for the capacity C of a parallel plate capacitor with plate area A for a maximum voltage of 10 V. How can you achieve maximum capacity and what are the limits? Hint: Consider field strength and relvant intrinsic length scales.

With frame

3.1.3 Summary to: 3.1 Thin Films - General

© H. Föll (Semiconductor Technology - Script)