Impact of Y2O3 Nanosheets on the Microstructural Characteristics of Alq3 Prepared via the Co-precipitation Route for Enhancement of Photodiode Performance.

In the present study, tris-(8-hydroxyquinoline) aluminum (Alq3) and tris-(8-hydroxyquinoline) aluminum/yttrium oxide Alq3/Y2O3 were synthesized by a facile chemical route. The crystal structure, surface morphological nature, and particle size were identified by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) micrographs. Ag/Alq3/p-Si/Al and Ag/Alq3:Y2O3/p-Si/Al diodes were fabricated by the thermal evaporation technique and the electrical characteristics were evaluated from the I-V plots in dark and under illumination intensity. Thermionic emission theory, Cheung-Cheung, and Nord model have been applied to define the main electronic parameters like series resistance (Rs), barrier height (ϕb), and ideality factor (n). The hybrid Ag/Alq3:Y2O3/p-Si/Al diode revealed a nonideal behavior with high shunt resistance Rsh and good photocurrent sensitivity. The C/G-V analysis indicated that both C and G are strongly affected by the presence of trapped charge carriers at the interface states. The obtained results indicated that Rs was decreased whereas the carrier concentration (Na) was increased by loading Y2O3 nanosheets.