Copper iodide as a potential low cost dopant for spiro MeOTAD in perovskite solar cells
Low cost inorganic copper iodide (CuI) is introduced as a potential oxidizer for hole transport material (HTM) in perovskite solar cells (PSCs) Characterization of oxidizability and energy levels indicates that the CuI can effectively oxidize spiro MeOTAD. Through solvent engineering and concentration optimization, the CuI (20% mole ratio) doped spiro MeOTAD gives higher power conversion efficiency (PCE) than that of the FK209 dopant. This work shows the promise of a state of the art method using a low cost dopant for hole transport material in perovskite solar cells.