as an organometallic chemist I'm certainly not a proven expert in this field. To my knowledge, researchers normally use sol-gel techniques and organic solutions of soluble vanadium precursors for spin-coating of V2O5 thin films. However, I just discovered a very interesting literature reference which exactly meets your needs outlined in your question. It was published in 1990 in the Japanese Journal of Applied Physics. The title is:
New Preparation Process of V2O5 Thin Film Based on Spin-Coating from Organic Vanadium Solution
Article New Preparation Process of V2O5 Thin Film Based on Spin-Coat...
In this study the authors start from commercially available V2O5 powder which was dissolved in a mixture of benzyl alcohol and iso-butanol to obtain a vanadium-containing solution which was subsequently spin-coated. Unfortunately this important paper has not been posted as public full text on RG. However, the senior author has an RG profile (Youichi Shimizu
). Thus it is certainly worth a try to directly contact this author via RG and request the full text of the article from him.
Good luck with your research and best wishes, Frank Edelmann