Tag: Photoresist

Member Post

 

Today we’re talking about strippers. By which I mean the machines and the process of stripping photoresist off of your material once the pattern has been applied. Now, the main problem with the strip operation, before you even get to the chemistry involved, is the number of bad jokes that are available. You don’t start […]

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How to Build a Computer 15: Developing

 

No, this isn’t a story that’s still in progress, this is a process step. ‘Developing’ in this context means you’re chemically removing half your photoresist (either the stuff that was exposed in a positive photoresist or the stuff that wasn’t in a negative photoresist.) And no, it’s not about guys making software either. Look, if you’re going to stop us every single time the chance for a bad joke comes up… actually that’s pretty much the game plan. Carry on.

An exposed photoresist molecule. The cheese is carbon, the sausage is oxygen, and I’m thinking it’s high time to conduct some more chemistry, if you know what I mean.

How to Build a Computer 14: Alignment

 

Last time we saw how you physically expose a panel. That is, how you shoot it with ultraviolet light to get a pattern into the stuff so that you can do things to that pattern later on. Today the plan is to talk about all the ways this can go wrong. We’ll start with the big one: alignment. If you’ll recall the profile of the jumping trace we looked at a couple weeks ago:

Hooray for a well-stocked media library!

How to Build a Computer 12: Exposing

 

We know how photoresist works and how to get it on your material. Or my material rather; most of you aren’t going to be running laminators but no matter. How about transferring a pattern to the photoresist? That’s what we’re going over today. To change the photoresist you’ve got to hit it with an ultraviolet photon. Here, let me demonstrate:

A chunk of photoresist with a bunch of common engineering tools on it. Especially the fez.

Member Post

 

We’ve seen how photoresist works, now we’re going to see how that actually works in the real world. Before you can print things with the patterns you draw in your photoresist you’ve got to draw those patterns. Before you can draw those patterns you’ve got to stick your photoresist on there. Today we’re going to […]

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How to Build a Computer 9: Photoresist

 

We’ve just got off a quick overview on organic chemistry. Now we’re getting back to photoresist. The point of photoresist, if you’ll recall, is to take a pattern so you can print stuff on your wafer. To do that it has to be a chemical that responds to ultraviolet light. And I mean more “responds to” than get a mild sunburn; it’s got to chemically change so you can transfer the pattern of light into a pattern of stuff.

It’s a polymer made of benzene rings. Someone’s showing off.