Talk:Piezoresistive effect

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J. Bartholomeyczik, I appreciate that you are studying the piezoresistive effect, and I'm sure you obviously understand the material, but it is one thing to include images from your thesis in here; quite another to cite yourself as a reference for more information. Interested readers with access to IEEE's resources should search there or find papers that are highly cited (by NON-wikipedia sources). Citing your own works is generally considered vanity on Wikipedia, NPOV, and is frowned upon in the community. Good luck with your thesis. Jwigton 02:42, 30 January 2007 (UTC)

Dear Jwigton, my thesis has been done for quite a while and I am not working in the field of academia anymore. I have added the reference using my username login not trying to obscure the source of this just because I wanted to reference to the source I took most of the information from (there was no pizeoresistive Effect in Wikipedia until I added it). The article was checked and modified by quite a few people before and nobody seemed to object. If it is not good wiki style to reference my own work being the source of some the information or not, plaease excuse that. Julian Bartholomeyczik 07:47, 1 February 2007 (UTC)

Explanation of Piezoresistive Effect in Silicon

The "three valley" and other things mentioned do not help in clarifying the relation between Resistivity and Stress on a semiconductor. Please hyperlink these terms to relevant articles in wiki or expand the explanation here.

--Ankurtg (talk) 20:45, 10 April 2008 (UTC)

Mention of Bridgman?

Not freely available, but the Smith article is here: http://prola.aps.org/abstract/PR/v94/i1/p42_1

He says in the first paragraph, "The effect of pure hydrostatic pressure on resistance has been extensively studied, notably by Bridgman, who also made the first piezoresistance measurements known to us on several polycrystalline metals." This refers to an article, "P. W. Bridgman, Proc. Am. Acad. Arts Sci. 60, 423 (1925)."

It seems to me this might be worthy of mention in the wiki article. (I could not find the Bridgman article online.)

Gauge Factor equation correct?

I am not quite sure, but I think you left out one of the most important parts of Gauge Factor. Namely, in the case of piezoresistive materials resistivity $\rho$ of the material itself is not constant. Therefore piezoresistive term should be added to GF:

$K={\frac {d\rho }{\rho }}+1+2\nu$

and ${\frac {d\rho }{\rho }}$ is piesoresistive term. --FERcsI (talk) 13:48, 8 September 2009 (UTC)

Piezoresistive effect ONLY on semiconductors?

Hello! im doing a little work on gauges. I have found in a source (Pallas - Areny) that the piezoresistive effect applies to metals as well, whereas this article states the contrary... any ideas? Please contact me if you have an opinion on this.

Thanks! —Preceding unsigned comment added by Dracheschreck (talk • contribs) 22:01, 1 November 2010 (UTC)

Yes, I'm certain that the statement that the piezoresistive effect applies to metals, and is not due just to the geometry change. This article is incorrect, and I'll work on updating it.

To the person who wrote that metals are not subject to the piezoresistive effect, if you wish to stand by this point then please find a citation for your claim.--JB Gnome (talk) 20:44, 9 February 2011 (UTC)

It is incorrect that metals do not show the piezoresistive effect. Making the metal film thin enough will change the properties from the bulk equation as it mentioned in the article to a more complex equation. Surface roughness starts to have an effect in the continuity of the film and thus piezoresistive properties are shown for metal strain gauges. For instance this patent can be found: http://www.google.com/patents/US7617736 — Preceding unsigned comment added by 80.60.119.152 (talk) 12:03, 15 April 2012 (UTC)

The piezoresistive effect applies to more than just semiconductors. See Xinyu Liu - Lab on a chip, vol 11, pages 2189-2196, year 2011, for an example. — Preceding unsigned comment added by 24.168.28.22 (talk) 19:19, 8 September 2012 (UTC) (Joshua Lessing)

Seems plenty of people found out about this issue, but nobody actually corrected it. The false claim seemed to have been corroborated by that textbook citation (Liu) but if you actually read that bookpage you find Liu says something different (*not* ruling out piezoresistivity in metals, only saying it is *usually* *small*). Therefore I revamped the "mechanism" section. I left the rest intact, as it at least seems not to be wrong even though heavily semiconductor biased.WikiPidi (talk) 09:03, 5 July 2013 (UTC)