Abstract
The effect of the volumetric ratio of the tris(8-hydro)(yquinoline) aluminum (Alq(3)) on its blend with the N,N'-Di [(1-nalahthyl)-N,Ni-Biphenyl]-(1,11-bipheny1)-4,4'-diamine (NPD) (Alq(3):NPD) is investigated and optimized for the UV photodetectors fabrication. The optical and structural properties of Alq(3):NPD blend with different volumetric ratios 1:1, 2:1, and 3:1 is studied in the context of the absorbance, transmittance, optical energy gap and XRD patterns. Results show that the absorbance is increased by 11% at lambda = 260 nm with the increase in the volumetric ratio. In contrast, the optical energy I:aandgap that is extrapolated from the Tauc's plot is decreased with the increase in the volumetric ratio, and the 2:1 ratio shows the lowest energy in the UV region. In terms of the XRDinvestigation, the 2:1 volumetric ratio shows the highest intensity for the crystallinity peak at 36.6. The fabricated photocletector with a different volumetric ratio of the active layer Alq(3):NPD blend shows the best performance with the ratio 2:1.