Talk:Indium gallium arsenide

Incomplete list of photodiodes
The commercial list of InGaAs photodiodes is incomplete. Please add www.judsontechnologies.com to the roster. Judson is a world leader in infrared photodetector technology. Thank you George Gasparian Judson Technologies
 * Adding most commercial links is against wikipedia policies. Materialscientist (talk) 05:56, 16 February 2010 (UTC)

Confusion about Gain-Bandwidth product in the section on electron mobility (Mobility of electrons and holes)
Is the equation formatted correctly? As it is, it renders like this:

$$Gain = \frac{\mu_{\rm e}}{\mu_{\rm h}}Gain-Bandwidth = \frac{\mu_{\rm e}V}{\pi L^2}$$

Which makes very little sense from a dimensional analysis standpoint. Gain (I assume) is dimensionless, and mu-e/mu-h is also dimensionless (since the dimensions of the top and bottom terms cancel), so (mu-e/mu-h)*Gain should also be dimensionless. But the way it's formatted implies that (mu-e/mu-h)*Gain has Bandwidth subtracted from it, which would mean we're subtracting Bandwidth (I assume measured in Hertz, units time^-1) from a dimensionless quantity. I was also confused about what L stands for, but after some dimensional analysis I conjectured that it must be length (length of what?), in order to get mu-e * Volts / (pi * L^2) to give units in Hertz (time^-1). But that would still imply Gain is measured in Hertz, which makes no sense to me.

When I looked at the page source, I (think I) finally figured out what was going on: there were actually two equations posted with no line break in between, combining them into what looks like a single nonsensical equation. Also, the phrase "Gain-Bandwidth" renders as (Gain minus Bandwidth), when it's actually supposed to be (Gain times bandwidth). So the correct rendering of the equations should be:

$$Gain = \frac{\mu_{\rm e}}{\mu_{\rm h}}$$

$$Gain \times Bandwidth = \frac{\mu_{\rm e}V}{\pi L^2}$$

Which at least makes sense from a dimensional analysis POV, although it still leaves me confused about how the second equation was derived: I can conjecture that Bandwidth must equal (mu-h * volts)/(pi * length^2), but there's no explanation for why this would be.

Can someone in the know fix this, or at least explain it better? Or both?

97.84.96.60 (talk) 06:03, 21 March 2015 (UTC)


 * After consultation with another user, I removed the offending subsection. Here's a link to the diff page, in case the material can be corrected and merged back into the article: http://en.wikipedia.org/w/index.php?title=Indium_gallium_arsenide&diff=653437660&oldid=648673983 97.84.96.60 (talk) 09:51, 25 March 2015 (UTC)

External links modified
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Band Gap Confusion of InGaAs
It is confusing to state that the band gap of a ternary alloy is just 1 discrete value. This is due to the band gap changing with alloy fraction. I do believe that this band gap is for STANDARD InGaAs (53% InAs 47%GaAs). Maybe it would be useful to add the bowing equation for InGaAs/InP? Tigercatface (talk) 12:47, 14 April 2023 (UTC)