I saw a few articles using vanadium oxide as hole transport material for perovskite solar cell by spin coating vo(acac)2 in isopropanol on substrate. Is the isopropanol capable of dissolving vo(acac)2 or it only act as dispersing medium? I tried stirring it but the vo(acac)2 powder sediments are still there, even after heating to boiling point of isopropanol. Did I did something wrong?
I do not have a direct experience with dissolving vanadyl acetylacetonate in isopropanol but i can give a conceptual answer helping you to solve the problem:
There is a maximum solubility of a material into a solvent.
So, i would advice you to start the dissolving process with low concentration and gradually increasing the concentration and observe the solubility limit. When the solubility limit is reached you can not dissolve more material into the solvent and the material remains unsolved.
This what you perhaps you experienced in your experiment.
There is difference between dissolving and suspending or dispersing.
In dissolution process there is mixing up to the level of molecules.
However both can be used for spin coating.
Best wishes
Thank you Abdelhalim abdelnaby Zekry for your guidance. My mistake, the journal i have read mentioned 1.5 mg/mL in isopropanol, somehow I mistaken it to 5 mg/mL when preparing it, which explained the remaining undissolved powder.
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