The preparation and characterization of copper aluminum diselenide (CuAlSesub2/sub) and Titanium dioxide (TiOsub2/sub)-doped with carbon based graphene nanocomposite thin films were examined. The temperature, deposition time, and pH of the medium was varied by spin coating method. Samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy dispersive x-ray (EDX) and UV visible spectroscopy techniques for the structural, morphological, compositional features and photo-response for photovoltaic devices. The optical property revealed that CuAlSesub2/sub films have energy band gaps range 2.22-5.80 eV and 2.10-2.14 eV at room and peak temperature. The XRD patterns of CuAlSe thin films showed peaks (101), (102), (006), (110), (108), and (116) corresponding to the formation of hexagonal phase of CuInSesub2/sub and the particle size D 38.20 nm. XRD pattern of C: CuAlSesub2/sub and TiOsub2 /subflakes were perfectly crystallized and the inter-planar spacing of 0.053 nm. FESEM analysis indicated smooth and uniform structures. The graphene-TiOsub2/sub displayed glistering surfaces due to less density of electronic trap states and improved absorption in the UV region. The resistivity of the samples were 1.95s/m and 12.93s/m for GO and GO-TiOsub2/sub. The results indicated that the average electron mobility depends on the probability of the electrons in the conduction band and as the quasi-Fermi level approaches the CB, a higher current, power supply and lower resistivity level.
Aminu et al. (Fri,) studied this question.