A thick TiO_2-CuO composite ?lm is deposited on a Si substrate by a low-cost screen printing method. Both anatase and CuOdoped TiO_2 are characterized for diode applications. X-ray Diffraction (XRD) con?rms that the composite ?lm exists as an anatase phase of TiO_2 and a monoclinic phase of CuO with a maximum diffraction of (101) plane. SEM images depict the less severe agglomeration of particles for the doped TiO_2 as compared to the anatase TiO_2. The UV-visible spectra reveal a direct band gap shift of 3.35 eV (pure TiO_2) to 3.26 eV (doped TiO_2). From the PL study, the blue shaded emission is perfectly derived for anatase TiO_2 while the color is seen to change to the white zone supporting TiO_2-CuO composite formation as depicted by the CIE diagram. The diode parameters such as ideality factor (n) and barrier height (Φb) are calculated with the help of I-V characteristics. This only reported novel effort on screen-printed TiO_2-CuO thick ?lm may help in manufacturing possible LEDs for optoelectronic applications.
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