# Exercise 2.6-1

## All Quick Questions / Class Exercises to

### 2. Semiconductor Materials and Products

| Subchapter 2.1: General Chemistry and Structure
|  | Ponder the history of "LCD" flat panel displays.
|  | Why does the world need saving? How shall it be done?
|  | Why do we use crystals, preferably single crystals, preferably "perfect" single crystals in case of doubt?
|  | Supply examples for critical parameter - component couplings.
|  | What makes a semiconductor interesting for technology?
|  | How would you like your bandgap, Sir?
|  | What does it mean to dope a semiconductor in reality?
|  | Come up with 2 - 3 examples where product requirements transfer to shape / structure requirements.
|  | Can you still afford it if your present product is hugely successful? - What could that mean?
|  | Provide examples (and criteria) for the products listed

| Subchapter 2.2: Silicon
|  | What is the approximate lateral size of one transistor in an IC?
|  | Why are there no 16 GB memory chips now.?
|  | What properties should a semiconductor have for making IC's?
|  | What exactly produced complexity and market growth rates of 30 % for more than 30 years (for Si IC's)?
|  | Where will it end?
|  | What do you know about MEMS?
|  | Are there any other uses of Si you know off (or can find quickly)?

| Subchapter 2.3: III-V Semiconductors
|  | What band gaps of which type would we like to have for III-V properties?
|  | What are the requirements for substituting light bulbs by LED's? Compare your answers to the list in the script.
|  | What are the requirements for substituting light bulbs by LED's? What is the state of the art?
|  | Amend and discuss the list of optoelectronic products given so far.

| Subchapter 2.4: Other Semiconductors and Products
|  | What are the strengths an weaknesses of Ge?
|  | Why is SiC both very desirable and very difficult as a semiconductor material?
|  | What are II-VI semiconductors and chalcogenides= Why are these materials of some interest?
|  | Name at least two important semiconductors of the above groups and what they are used for.
|  | What are organic semiconductors and their important uses?

With frame

2.6.1 Summary to 2. Semiconductor Materials and Products

© H. Föll (Semiconductor Technology - Script)