I am conducting an electrochemistry experiment that requires an n-type doped single crystal wafer of ZnO. It seems that any manufacturers of these wafers have stopped producing them 2+ years ago. Does anyone have a lead on where I can find some urgently?
Hi Matt,
Check these sites:
http://www.pmoptics.com/zno_wafer_substrate.html
http://www.universitywafer.com/Wafers___Services/Zinc_Oxide_Wafers/zinc_oxide_wafers.html
http://www.semiwafer.com/products/zno.htm
Serge
Unfortunately pmoptics, universitywafer and semiwafer do not carry n-type doped ZnO, only intrinsic ZnO!
Did you go after every single company you can find in Internet for n-type?
What do you mean by intrinsic? Even if nominally undoped, ZnO single crystals are typically n-type. For example, 0.003 wt-% of Al (n-type dopant) means about 5e18 cm-3.
Typical free carrier (electron) concentrations in nominally undoped ZnO single crystals are im the 1e17 cm-3 range.
"The native doping of the semiconductor (due to oxygen vacancies or zinc interstitials) is n-type... Most ZnO has n-type character, even in the absence of intentional doping. Nonstoichiometry is typically the origin of n-type character, but the subject remains controversial. An alternative explanation has been proposed, based on theoretical calculations, that unintentional substitutional hydrogen impurities are responsible."
http://en.wikipedia.org/wiki/Zinc_oxide
...unless you need concentrations exceeding 10^17 cm-3
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