Abstract
Recently, the efficient preparation techniques of zinc sulfide (ZnS) nanostructured films have drawn great attention due to their potential applications in optoelectronics. In this study, the low-cost and high-yield chemical bath deposition (CBD) technique was used to deposit ZnS nanostructured thin films. The effect of various deposition parameters such as time, pH, precursor concentration, and temperature on the morphology and energy bandgap (Eg) of the prepared thin films were investigated. The characterization of the prepared thin films revealed the formation of polycrystalline ZnS with Narcissus-like nanostructures. Moreover, the optical characterization showed inverse proportionality between both the transmission and Eg of the nanostructured thin films and the variation of the deposition parameters. A range of different Eg values between 3.92 eV with 20% transmission and 4.06 eV with 80% transmission was obtained. Tuning the Eg values and transmission of the prepared nanostructured films by manipulating the deposition parameters of such an efficient technique could lead to applications in optoelectronics such as solar cells and detectors.
Highlights
zinc sulfide (ZnS) has been considered as the best material to be used as an alternative buffer layer for cadmium sulfide (CdS) in CZTS solar cells [13], light-emitting diodes [14], catalysis [15], gas sensors [16], thermal sensors [17], and biosensors [18]
Adsorption, surface diffusion, reaction, nucleation, and growth are the fundamental aspects of the chemical bath deposition (CBD) growth mechanism
ZnS nanostructured films are formed by the decomposition of Tu ion source) in an alkaline solution containing zinc acetate (Zn2+ ion source) and (NH4 OH) as a complex agent
Summary
Zinc sulfide is one of the most important large bandgap II-VI semiconductors, which have recently been identified as some of the best optoelectronic computing materials because of their useful properties, in particular their nontoxicity [1]. ZnS nanostructures have been successfully synthesized in different nanostructure types such as nanowires [6], nanobelts [6,7], quantum dots [8], and nanotubes [9]. They can be integrated into a wide range of nanoscale devices, in particular piezotronics, photovoltaics, and photodetectors [9,10,11,12].
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