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Usefulness of blank Si / GaAs wafers

 
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ray_parkhurst



Joined: 20 Nov 2010
Posts: 2049
Location: Santa Clara, CA, USA

PostPosted: Fri Jan 18, 2019 6:32 pm    Post subject: Usefulness of blank Si / GaAs wafers Reply with quote

At the last electronics swap meet I picked up some blank Si and what I think are GaAs wafers. There are 3" and 4" Si and 2" GaAs. Some are polished one side, while others are etched to a matte finish.

My question is "what useful thing can be done with them?"

Thanks in advance for your valuable suggestions!
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1249
Location: Phoenix, Arizona

PostPosted: Fri Jan 18, 2019 7:21 pm    Post subject: Reply with quote

... frisbees?
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palea



Joined: 17 Dec 2018
Posts: 21

PostPosted: Fri Jan 18, 2019 8:28 pm    Post subject: Reply with quote

I used the one I had as a coaster for a while until it eventually and inevitably got accidentally broken. They can be entertaining for bouncing light around as well but the other main use seems to be showing people what a wafer looks like.

Some people DIY chip fab but that's uncommon.
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dickb



Joined: 05 Jul 2010
Posts: 151

PostPosted: Sat Jan 19, 2019 6:16 am    Post subject: Reply with quote

Maybe you can use the etched side to test a camera setup for perfect alignment, assuming it gives you enough detail to focus on..
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ray_parkhurst



Joined: 20 Nov 2010
Posts: 2049
Location: Santa Clara, CA, USA

PostPosted: Sat Jan 19, 2019 7:24 pm    Post subject: Reply with quote

Seems these are of limited utility. Probably will e-waste them...
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Beatsy



Joined: 05 Jul 2013
Posts: 1504
Location: Malvern, UK

PostPosted: Sun Jan 20, 2019 7:39 am    Post subject: Reply with quote

ray_parkhurst wrote:
Seems these are of limited utility. Probably will e-waste them...

Before you throw them away, use them as practice pieces for cleaving wafers. That way, when you get a nice wafer full of dies, you'll be ready to accurately dice it into smaller pieces for more convenient photography.
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ray_parkhurst



Joined: 20 Nov 2010
Posts: 2049
Location: Santa Clara, CA, USA

PostPosted: Sun Jan 20, 2019 7:47 am    Post subject: Reply with quote

Beatsy wrote:
ray_parkhurst wrote:
Seems these are of limited utility. Probably will e-waste them...

Before you throw them away, use them as practice pieces for cleaving wafers. That way, when you get a nice wafer full of dies, you'll be ready to accurately dice it into smaller pieces for more convenient photography.


I'm already pretty good at that from my day jobs.
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Beatsy



Joined: 05 Jul 2013
Posts: 1504
Location: Malvern, UK

PostPosted: Sun Jan 20, 2019 7:57 am    Post subject: Reply with quote

ray_parkhurst wrote:
Beatsy wrote:
ray_parkhurst wrote:
Seems these are of limited utility. Probably will e-waste them...

Before you throw them away, use them as practice pieces for cleaving wafers. That way, when you get a nice wafer full of dies, you'll be ready to accurately dice it into smaller pieces for more convenient photography.


I'm already pretty good at that from my day jobs.

Haha, soon as I hit "submit" I wondered if that might be the case. Soz. Embarassed
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