In this work, a method of enhancing the electrical properties of the electrodeposited p-type Cu 2 O film is described. Sodium doped Cu 2 O was achieved by adding sodium aluminate complex solution to the electrodeposition alkaline Cu (II) lactate electrolyte. The optimal Na content [Na at% atomic ratio] incorporated in the Cu 2 O film was found to be approximately 1.34 at.%. The XPS result shows that the binding energy at 1072.4±0.2 eV corresponds to the presence of sodium in sodium oxide. The optimized resistivity and the hole concentration were approximately 291 Ω cm and 2.13×10 18 cm 3 , respectively. A Cu 2 O p-n homojunction solar cell with 2.05% efficiency was fabricated using a Cl-doped n-type Cu 2 O film and an optimized Na-doped Cu 2 O film.

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