Did you consider www.ossila.com ?

I hope you are not using liquid electrolite in the OPV then you just need a aluminium wire which may be deposited using a thermal evopuration technique.

There are many companies those produsing 99.9% pure Al

Alfa aser, sigma aldrich, merck etc.

Hope it will help you.

Thank you very much

small clarification - I need a film in nanometers, can we use thermal evaporator ?

if so how to control thickness of film in thermal evaporator.