Metal–oxide–semiconductor Puns

Journal of the American Chemical SocietyDOI: 10.1021/jacs.0c00561

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I'm a geochemist working on a mixed valence Fe (II, III) oxide, and I'm curious what effect doping of metal cations would have on the oxide's conductivity. For example, would Zn substitution (full 3d orbitals) make the oxide an electron-donating n-type semiconductor? And would substitution of Mg and Al (empty 3d orbitals) make it an electron-accepting p-type semiconductor?

Diffused Metal Oxide Semiconductors

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I can't seem to wrap my head around this. When doping a metal oxide by replacing the cation with a different formal charge, how does this change the properties? For example in indium oxide (In2O3), why does doping with Sn4+ increase the n-type electrical conductivity? Shouldn't it do the opposite? What effect would doping In2O3 with a monovalent or divalent cation have?

I would also gratefully accept a link to a good review on this subject. Most of the ones I've found so far are either too basic (only giving the Si n-doped vs p-doped example) or way too complicated.

Semiconductor materials vying for silicon's crown are everywhere, it seems. One substrate that's been in research for many years is cuprous oxide. Is it a blip on the radar or the next heir apparent?

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Journal of the American Chemical SocietyDOI: 10.1021/jacs.1c10535

Byung Hee Ko, Bjorn Hasa, Haeun Shin, Yaran Zhao, and Feng Jiao

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I’m attempting to reduce metallic oxides to either their metallic state or to their hydrides using gaseous hydrogen at elevated temperature. Is there a chemical property series similar to the electrochemical reduction potentials to tell with which metals this might be possible? I.e how can I predict if I can regenerate metallic Fe or Nb or W or Ti or Cu from their oxides in this way? If a one step reduction isn’t possible, how are these metals regenerated in a multi-step process?