Abstract
The present study focuses on the structural and electrical properties of doped zinc–lead iodide (Zn–PbI2) as-deposited film. Lead iodide (PbI2) nanostructure was successfully prepared by thermal evaporation method on a glass substrate at room temperature. The analysis, characterization, and structural properties of PbI2 were achieved using X-ray diffraction (XRD) and scanning electron microscopy. The PbI2 was polycrystalline and had a hexagonal structure as proved using XRD. The measured values are in agreement with other experimental and theoretical data. Furthermore, the present research studied the effect of doping on the physical properties of lead iodide with zinc dopants at different weights (0.02, 0.04, 0.06, and 0.08) mg. The electrical properties of the fabricated metal–semiconductor–metal photodetector based on PbI2 and Pb1−xZnxI2 layers prepared on glass substrates by thermal evaporation method were investigated. The obtained results of Schottky barrier heights for Pb0.98Zn0.02I2 were significant. The current–voltage characteristics of the Pb0.98Zn0.02I2 thin film have acted as a Schottky contact in dark and under white light, 460-nm light. The light responsivity has shown a peak at 460-nm chopped light. At a bias voltage of 1, 3, and 5 V, the photocurrent rise and decay times were investigated. The device has shown faster response times for 460-nm light. This fast response was attributed to the high quality of polycrystalline and showed a high quantum efficiency of 9.19 × 102% when it was illuminated by 460-nm light under the bias of 3 V.
Highlights
The deposited film of doped Zn–PbI2 with different weights of zinc dopants on the glass substrate was prepared successfully
Lead iodide (PbI2) is a wide bandgap semiconductor (Eg = 2.32 eV) and has been a semiconductor material for use in solid-state X-ray and gamma-ray detectors [1, 2]
The energy bandgap from optical absorption is measured from Zn–PbI2 thin films deposited on glass substrates using a UV–Vis spectroscopy
Summary
The deposited film of doped Zn–PbI2 with different weights of zinc dopants on the glass substrate was prepared successfully. PbI2 thin films were deposited on glass substrates at room temperature using electron beam evaporation (Auto 306 Vacuum Coater). Glass substrates were provided of thickness 1 mm and dimensions 15 × 20 mm prior to the thermal evaporation of PbI2.
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