Dear Artur sir, " Why do you want to store WO3 films ? "-- because I need to do I-V measurement later.

keeping samples in desicator with drying agent might prevent the H2O pick up process.

thank you for your response, Sir

Dear Thomas Sir, I can't do the measurement right after the deposition as for measurement and even for growth I depend on other lab. but keeping your suggestion in mind I will try to do it as quickly as I can.

thank you sir.