In this work, HgI2 nanotubes/Si heterojunction has been prepared by pulsed laser ablation in ethanol at laser fluence of 12.7 J/cm2. The structural and optical properties of HgI2 nanotubes (NTs) are studied. The X-ray diffraction (XRD) result shows the presence of the mixture of tetragonal and orthorhombic phases of HgI2. The optical properties results show that the optical energy gap of HgI2 NTs was 2.98 eV measured at room temperature. The photoluminescence (PL) spectra of HgI2 display a single emission centered at 535nm. Fourier transformed infrared (FT-IR) results reveal the existence of small bonds at 612 and 1102 cm− 1. Scanning electron microscope (SEM) image show formation of nanotubes and spherical nanoparticles with average particle size of 23nm. Transmission electron microscope (TEM) image of HgI2 confirms the formation of nanotubes morphology with an average diameter of 80nm and an average length of 1.6µm. The I-V curve of HgI2 NTs/p-Si heterojunction were measured at dark and illumination. The responsivity of HgI2 NTs/p-Si heterojunction photodetector is 1.09A/W at 450 and the detectivity and external quantum efficiency are 3.6 ×1012 Jones at 450 and 3×102% at 400nm, respectively, without using post annealing.

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