I'm using cvd to deposit Cu2O onto FTO glass. I have a basic understanding as to how cvd works, but I can't explain certain things. For example, I'm using a Cu(acac) precursor and I'm getting different oxidation states of Cu on the substrate. For lower temperatures I'm getting Cu metal, as I increase the temperature I get Cu2O and increasing even more I get CuO.
Can somebody help me explain why the oxidation states are changing with increasing temperature?