Enhancing the performance of dye-sensitized solar cell using nano-sized erbium oxide on titanium oxide photoanode by impregnation route oleh S.H.A. Ahmad, Amir Al-Ahmed, Abbas Saeed Hakeem, Thamraa Alshahrani, Q. Mahmood, Umer Mehmood, H.A. Qayyum, Muhammad Younas, Muhammad Illyas, H. Dafalla, Rahila Jawaid, A. Laref, Anya Josefa Yago