Talk:Photoresist

Wiki Education Foundation-supported course assignment

This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): May lam. Peer reviewers: Halie1758.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 06:36, 17 January 2022 (UTC)

More Information about Positive Photoresist

There are definitions of positive and negative photoresist in the beginning. However, there is only detailed information about negative photoresist. So should we add more explanation and detail about positive photoresist to supplement the whole topic? May lam (talk) 03:44, 23 January 2017 (UTC)

Dear All, I am a student editor. Could I still use some of the information in the previous pages but change the article structure? And I also want to add more information into the previous pages. May lam (talk) 19:49, 19 February 2017 (UTC)

Hoechst AZ 4562

Can I still buy Hoechst AZ 4562; or a similar photoresist?

The text infers that Hoechst AZ 4620, Hoechst AZ 4562 are still available to buy from Celanese but I spoke them and Celanese have only taken on some of the Hoechst products. It appears that Hoechst was split between Celanese and some other companies but I can't find out who the others were or if they still produce photoresists.

Is AZ 4562 still available please? SpinJinny (talk) 15:49, 30 April 2009 (UTC)

I have now found a European supplier at: http://www.az-em.com/products.html SpinJinny (talk) 15:24, 6 May 2009 (UTC)

What about e-beam?

I don't know much about resists but it seems like a mention of resist for e-beam lithography is in order, and perhaps a few words about resists for soft lithography like PDMS. Maybe a table would be a good way to summarize this kind of material? Alison Chaiken 06:04, 28 January 2006 (UTC)

Sounds like a natural idea to include e-beam. Other articles have referred to photoresists in electron beam lithography? 61.62.56.136 03:39, 29 January 2006 (UTC)

Huh, I just noticed that not only is there an electron beam lithography article, there's a long one called resist that this article should be merged with. Assuredly photoresist is a better article title. Alison Chaiken 03:56, 29 January 2006 (UTC)

Yes, it looks like the resist and photoresist articles can be merged. Some organization will be necessary afterwards. The resist article focuses more on applications, the photoresist article focuses more on how photoresists work.Guiding light 04:20, 29 January 2006 (UTC)

I put the previous contribution by Chemprof on low energy electron interactions in the section on electron exposure. 61.61.254.9 02:42, 16 May 2006 (UTC)

Hi, I manage a cleanroom and use both photo and e-beam resists. Photo resists are a subject unto themselves, they cover a huge range of process parameters, and resist behaviors. E-beam resists by comparrison are a very small subject. Since you are getting picky don't forget X-Ray resists and nano imprinting "resists" Brig Young <@uidaho.edu> 12:00, 17 May 2006 (PDT)

Hi, can you specify more clearly how photoresists are distinguished from electron beam resists? Usually the photoresists are chemically more complicated and sensitive, so we can have simpler procedures for the ebeam resists like PMMA or ZEP.211.72.108.18 14:34, 18 May 2006 (UTC)

Quite simply, the substances that react to light are not the same substances that react to electrons. The article needs to make this clear. --Smack (talk) 22:20, 2 January 2007 (UTC)

It's true, electron-beam resists do not need to be photoresists, even though photoresists have some response to electrons (though not necessarily ideal). The photoresist must have a component that is sensitive to a particular wavelength, but the electron-beam resist does not need it. For electron beam resists, the polymer chain molecular weight is more critical.Guiding light 05:03, 10 January 2007 (UTC)

Scission

First of all, what is it? The article assumes that the reader knows. Secondly, is there a Wikipedia article that links to it? Directly linking to scission redirects to a science-fiction writer's page. TimD 01:36, 5 June 2007 (UTC)

Scission has to do with "cutting" the polymer chain bonds. — Preceding unsigned comment added by 169.233.214.159 (talk) 20:48, 11 January 2012 (UTC)

Photoresist Process Flow

Should we include a diagram showing the process flow for positive and negative resists? It provides a succinct explanation of the difference between the two, and more importantly will be an invaluable reference. (Markscott85 (talk) 19:22, 3 March 2010 (UTC))

there is an excellent description and diagram outlining he process att http://www.ami.ac.uk/courses/topics/0224_img/index.html Biketag (talk) 17:58, 4 April 2010 (UTC)

External links section

I do not see any links that are truly worth keeping. Yhis section is degraded into a vendors' directory. Any objections to a cleanup in the near furure? --DrTorstenHenning (talk) 15:34, 21 January 2009 (UTC)

Please don't, It has been very useful to me. GCS Feb 09

As a vendor? Or as a typical Wikipedia user? Or as someone who is looking to buy photoresist? --DrTorstenHenning (talk) 14:39, 7 March 2009 (UTC)

Clarification about positive photoresists versus negative photoresists

Are positive photoresists generally "temporary" resists and negative photoresists generally "permanent" resists? My only exposure to this field is SU-8, which is a negative near UV photoresist. I have access to UV-6, which is a positive deep UV photoresist, so before I design a process, which necessitates a "temporary" [as in easy to remove and not desired in the final device fabrication] photoresists, around UV-6 I'd like to know that it'll work out.

My intuition says that's likely because positive photoresists are baked on and the parts that are exposed become soluble, so you can just develop the exposed parts away whereas negative photoresists have parts that are exposed and become _insoluble_. In SU-8's case, it's seemingly indestructible to the point where if I do manage to "destroy" the exposed SU-8, I will end up destroying any devices that were patterned with the help of SU-8.

SU-8 seems like it's used as a structural support element in MEMS and not really used in electronics. — Preceding unsigned comment added by 169.233.214.159 (talk) 20:54, 11 January 2012 (UTC)