Impact of the meso-PSi substrate on ZnO thin films deposited by spray pyrolysis technique for UV photodetectors

Abstract

ZnO thin films were successfully deposited via spray pyrolysis technique over various substrates, including glass, silicon, and mesoporous silicon (PSi). The effect of substrate type on the surface morphological, structural, and electrical properties of ZnO thin film was investigated. Scanning Electron Microscopy confirms the morphology of the meso-PSi substrate and displays the morphologies of the deposited ZnO. The (ZnO/PSi) heterojunction shows a porous ZnO layer with a large surface area by comparison to other structures. The patterns of X-ray Diffraction exposed that the deposited ZnO films have a hexagonal wurtzite polycrystalline structure. Ultraviolet (UV) metal-semiconductor-metal photodetectors have been investigated. The fabricated (ZnO/PSi) UV photodetector showed much higher photocurrent than other structures.

Growth of Nanofibers Zinc Oxide on Porous Silicon Substrates using Electrospinning Method: Effect of Temperatures

“…In this work, the bonding between Zn-O is 668 cm -1 . Bands formed at 1008 and 1089 cm -1 are attributed to the stretching mode bond of Si-O-Si [12]. The band at 1374 cm -1 and 1462 cm -1 are due to C=O and C-O modes of vibration [18][19] [20].…”

“…The band at 1374 cm -1 and 1462 cm -1 are due to C=O and C-O modes of vibration [18][19] [20]. In addition, the band found at 2908 cm -1 correlates with the bond of Si-Hx [12].…”

“…PSi has antireflective properties, stability, and improved light-trapping of photons [11]. In a previous study, Rahmani et al carried out the growth of a ZnO thin film on a PSi substrate using the spray pyrolysis technique [12]. The results showed that the deposition of ZnO on the PSi substrate could reduce the reflectance value.…”