How Silicon Wafers are made

[EastCoasthandle]

I found this when someone inquired why wafers were not square in another thread and found a what appears to be the answer why (good stuff IMO).

Silicon Wafer

because the ingots are made by slowly pulling a single big chrystal (vital for IC production; solar cells are multi chrystal -->cheaper to produce) out of molten silicon (most commonly used technique)

then, those are cut into ~1mm thick wafers

Ingot & Wafer

you dont get a single christal if you cast the silicon (and it wouldnt be as pure as necessary)


here you can see what happens if you cast silicon (the picture is cast titanium, but you can see the diffrent christals clearly

This is because the Crystal Pulling process will naturally form a cylinder shape monocystalline ingot.

The ingot is then cut into thin slide which become what you see in the picture you show.

IE: the 1st picture in this post.

Ingot

 

[CyberDruid]

Those ingots are incredibly sexy. I want one.

 

[phanbuey]

this may also be helpful

http://en.wikipedia.org/wiki/Czochralski_process

 

[LittleLizard]

i dont get why they arent square but they look nice.

 

[a_ump]

i've always been quite interested in silicon wafers and hwo all that stuff was made and why in circles as someone apparently asked u b4. thx

 

[mlee49]

Thanks EastCoast, top notch as always.

 

[EastCoasthandle]

Here is another pic showing an ingot being drawn out of melt.

You can see why it's round and not square.

 

[largon]

Those ingots are incredibly sexy. I want one.

Agreed.
No Feng Shui deco is complete without a ½-1 ton weighing 2 meter long lump of rock.
A techgeek without an ingot sitting in the corner of the livingroom is like an indian without a totem pole.

 

[diredesire]

Agreed.
No Feng Shui deco is complete without a ½-1 ton weighing 2 meter long lump of rock.
A techgeek without an ingot sitting in the corner of the livingroom is like an indian without a totem pole.

I think you mean: lump of melted sand

 

[largon]

Sand = small rocks.

 

[denice25]

great info.. thanks...

 

[yogurt_21]

interesting, now where's the teckgeeks ingot store so we can keep up with the gates's

 

[NdMk2o1o]

I seen some people having embolisms over 2 year old dead threads being resurrected, but well done to you, you've managed to reply to a 7 year old dead thread

 

[jboydgolfer]

I seen some people having embolisms over 2 year old dead threads being resurrected, but well done to you, you've managed to reply to a 7 year old dead thread

isnt there like a Whole disclaimer??

"are You sure you want to repy to this thread from when Ronald Regan was president"? with a check-box too...sort of like a Self destruct sequence Key/Button.... takes two guards, and the correct launch codes

 

[dorsetknob]

this is about the 4th resurected thread in as many days
Mussels or
@Tatty_One will be here soon

 

[rtwjunkie]

Wait, did the offending party delete his post? That's screwed up.

 

[RCoon]

Wait, did the offending party delete his post? That's screwed up.

No, he/she/it was banned.

 

[AsRock]

isnt there like a Whole disclaimer??

"are You sure you want to repy to this thread from when Ronald Regan was president"? with a check-box too...sort of like a Self destruct sequence Key/Button.... takes two guards, and the correct launch codes

Thing is i don't see why people get so bent up over it tbh.

Get over it and move long, people tell you search the internet to find some thing then they tell you make a new thread because the last one was old, what a load of BS.

 

[RCoon]

Thing is i don't see why people get so bent up over it tbh.

Get over it and move long, people tell you search the internet to find some thing then they tell you make a new thread because the last one was old, what a load of BS.

A substantial amount of thread necros are made by bots or complete morons. There have been a number in the last week, all bots, or idiots spouting nonsense for no particular reason and not adding anything to the thread of value (example: http://www.techpowerup.com/forums/threads/msi-geforce-gtx-970-gaming-4-gb.208093/page-2#post-3452903).

If some new member who's not a bot nor a total chungus necros a thread with valuable information pertaining to the OP, then we as mods leave it be. Members can scream about necros all they want, if the resurrecting post is of value, we don't do a thing no matter how much they moan and stomp their feet. They're not mods so... who cares?

 

[dorsetknob]

Did Suggest in one of those threads after they had been necroed weather it was possible for thread coding to flag it to the mods for authorization before a necroed post could be displayed
but it was deleted in the thread clean up

 

[AsRock]

Anyways missed this thread when it was posted .

 

[rtwjunkie]

Anyways missed this thread when it was posted .

Actually, some of these give me a chance to go back and possibly pick up cool information!

 

[jboydgolfer]

A substantial amount of thread necros are made by bots or complete morons. There have been a number in the last week, all bots, or idiots spouting nonsense for no particular reason and not adding anything to the thread of value (example: http://www.techpowerup.com/forums/threads/msi-geforce-gtx-970-gaming-4-gb.208093/page-2#post-3452903).

If some new member who's not a bot nor a total chungus necros a thread with valuable information pertaining to the OP, then we as mods leave it be. Members can scream about necros all they want, if the resurrecting post is of value, we don't do a thing no matter how much they moan and stomp their feet. They're not mods so... who cares?

That guys "special".
Ive done it i think, but iirc, the check box warning about the thread being ancient wasnt implemented at the time,and i misread the date.but im certainly guilty of content-less posts myself.

I can also see what asrock means too... but i suppose leaving them dead is best.

One has to wonder tho,is reviving the dead thread worse than 10 posts regarding the revival off topic of the original subject?a quandry

 

[Tatty_Two]

Also regarding thread necro, if you take a look at those that are intentionally genuine and not spam, most often it turns out that a 5 year old problem that is the same or similar rarely is and therefore the thread goes off in a completely different direction, IMO far better to start a thread with a new issue rather than posting in a 5 year old thread simply because it was perceived as being related, probably just laziness in the end anyway....... ohhh and I hate necro's, I take great pleasure in hunting them down

 

[dorsetknob]

TATTY and the Ban Stick V the Zombie thread Resurrectionist