How should doped silicon wafers be handled?

  • Thread starter radaballer
  • Start date
  • #1
86
0

Main Question or Discussion Point

I am doing a side project with some doped silicon wafers. What precautions should I take when handling wafers? Is it necessary to wear gloves and use deionized water when rinsing the wafers?
 

Answers and Replies

  • #2
Drakkith
Staff Emeritus
Science Advisor
20,745
4,451
What are you using them for?
 
  • #3
86
0
  • #4
nsaspook
Science Advisor
925
1,228
Most dopant's are extremely toxic so yes you need to use the proper facility PPE when handling wafers. That usually includes gloves and eye protection at a minimum. Your body is also a large source of contamination (like skin oils) so proper handling devices like wafers tweeters should be used. Ultra pure DI water should always be used as a rinse to reduce surface contamination.
 
  • #5
86
0
Most dopant's are extremely toxic so yes you need to use the proper facility PPE when handling wafers. That usually includes gloves and eye protection at a minimum. Your body is also a large source of contamination (like skin oils) so proper handling devices like wafers tweeters should be used. Ultra pure DI water should always be used as a rinse to reduce surface contamination.
I touched them with my hands, should i be alarmed?
 
  • #6
2
0
Extremely carefully!! Although its mostly because you don't want to break it. I've done work in a semiconductor lab where we handled doped silicon wafers in the form of silicon detectors used in collider experiments, although these are doped with different concentrations compared to wafers for commercial purposes. The most commonly used dopants are boron or phosphorus, but they exist in concentrations that are too small to affect you biologically. They are also bound within the crystal lattice of the silicon. The silicon is usually passivated, so you wouldn't be touching the dopants, but it's not recommend as getting skin oil on them could affect them electrically. So, touching them with your bare hands is, while safe, not good for the electronics. As nsaspook said, you can clean it with deionized water.

When you say you are building a diode, do you mean you currently have plain silicon wafer?
 

Related Threads on How should doped silicon wafers be handled?

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
5
Views
9K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
1
Views
1K
Replies
10
Views
2K
  • Last Post
Replies
1
Views
319
  • Last Post
Replies
11
Views
4K
  • Last Post
Replies
7
Views
4K
Top