May I know why most literature, including yours, use ITO/ETL/P3HT:PCBM/MoOx/Ag configuration instead of .../MoOx/Au configuration? Does MoOx/Ag have any workfunction advantage over MoOx/Au (Since Au has a higher work function than Ag)? If so, is it possible to please explain or give any guidance to find reference articles that discuss this?