ZnO/CuO/CdS Heterojunction Nanostructures as N-P-N for Optoelectronic Applications Effectiveness of Optoelectronic Devices.

A simple chemical method for producing ZnO/ CuO/ CdS nanoparticles using a chemical route (SILAR) method has been utilized. XRD patterns show hexagonal structures for ZnO, spheres, and cubic-formed CuO/CdS nanoparticles. Nanoparticles showed a blue shift in their UV-VIS energy band edge with (3.7, 3, and 3.2) eV for ZnO, CuO, and CdS. The morphology of ZnO, CuO, and CdS nanoparticles is investigated using scanning electronic microscopy (SEM). The XRD pattern reveals that the crystallites size are 15–30 nm. Photoluminescence reveals a yellow-green (520 nm) region for ZnO, a blue (380 nm) region for CuO, and a red (440 nm) region for CdS. The CdS wideband gap restricts its application. In this manner, we combined ZnO, CdS, and CuO for the band gap design of the heterojunction and to get improved optoelectronic properties. Present results show that heterojunctions could be useful for long-term usage and effective photodiode applications. [ABSTRACT FROM AUTHOR]