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Abstract
In this work, pure and monovalent Na+ ion-doped Cu2Se thin films were deposited on glass substrates using a simple chemical bath deposition method and the films were annealed at 200 °C. The effect of Na+ doping on the structural, surface morphological, compositional, optical, and electrical properties of the Cu2Se thin films was investigated using X-ray diffraction, field-emission scanning electron microscopy (FESEM), diffuse reflectance spectra, and Hall effect analysis. The X-ray pattern reveals that both pure and Na+-doped Cu2Se thin films crystallized in cubic structure with a shift for Na-doped films indicating the incorporation of Na into host Cu2Se site. FESEM images show uniformly distributed multi geometrical shape particles. Na-doped films show higher absorption in the visible region. The energy bandgap is about 2.5–1.52 eV for Na-doped films. The films were found to be p type and the electrical conductivity of the doped films is found to be less than the Cu2Se films.
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