Preparation and characterization of ZnO/ZnAl2O4-mixed metal oxides for dye-sensitized photodetector using Zn/Al-layered double hydroxide as precursor

Abstract

In this article, a simple new technique has been developed for the preparation of ZnO/ZnAl₂O₄-mixed metal oxide (MMO) as anode materials for visible light dye-sensitized (DS) photodetector using Zn/Al-layered double hydroxide (LDH) as precursor. Subsequently, a detailed correlation between the structural properties of the prepared samples and the photoresponsive behavior of the fabricated DS photodetectors was elucidated. Specifically, it is evidenced that a high surface area of the prepared mesoporous MMO anode materials exhibit excellent dye absorptivity and thus facilitate free electron transfer and increase the photocurrent in the fabricated DS photodetector. A significant bathochromic shift was observed in the optical energy of the prepared MMO samples under the increment of molar ratio, providing a short electron transfer pathway in the optimized Z7A DS photodetector, which in turn demonstrated photo-responsivity and photo-detectivity of 6 mA/W and 1.7 × 10⁺¹⁰Jones, respectively. This work presents an alternative approach for the design of an eco-friendly MMO-based DS photodetector.

Synthesis of LN/Si Nanostructures Layer by LayerBased on Mach-Zehnder Modulator using Pulsed Laser Deposition

“…In this formula, R is the reflectance as given in Equation Fig. 6 shows optical energy bandgap (Eg) of nanostructured of hybrid MZM, it value was deduced depended on extrapolation line of (αhv) 2 as a function the incident wavelength energy (hv) , using Tauc formula it has been evaluated [18,19], Its value found to be about Eg= 1.9eV. The Photo lumnciense spectra of nanostructured hybrid MZ modulator grown on the silicon substrate is shown in fig (9).…”

Increased Mechanical Properties of Carbon Nanofiber Mats for Possible Medical Applications

“…Here, an easier method was used to investigate whether a significant amount of ZnO is in contact with the environment. ZnO belongs to the semiconductors used in dye-sensitized solar cells, typically showing a clearly visible bathochromic shift of the color of diverse dyes adsorbed on the material [40][41][42][43]. While in most applications, the nanofibers used have a very high surface-to-volume ratio, here the increase of the nanofiber diameter is not critical.…”

In-Depth Optical Analysis of Zn(Al)O Mixed Metal Oxide Film-Based Zn/Al-Layered Double Hydroxide for TCO Application

“…Herein, the discussed contamination and defects can be controlled through Zn 2+ to Al 3+ molar ratio alteration within the LDH structure [19]. In addition, thermal calcination of LDH results in the 2D layers' diminishment and the continuous formation of MMO structure, which consists of metal oxide and spinel phases [20]. The MMO formation has demonstrated a great attraction within research societies in many applications such as dye-sensitized solar cell [21], photodetector [22,23], and gas sensor [24,25], etc.…”