How expensive are germanium wafers? Wikipedia states that historically cuprous oxide is one of the most studied semiconductors: https://en.wikipedia.org/wiki/C

How expensive are germanium wafers? Wikipedia states that historically cuprous oxide is one of the most studied semiconductors: https://en.wikipedia.org/wiki/Copper(I)_oxide#Semiconducting_properties https://en.wikipedia.org/wiki/Copper(I)_oxide#Semiconducting... Do you know of any comprehensive reviews of cuprous oxide, referencing the most important theory and applications, and (lab or commercial) devices constructed? Do you think it is possible to make cuprous oxide transistors?