Development and Optical Properties of ZnO Nanoflowers on Porous Silicon for Photovoltaic Applications

Taherkhani, Morteza; Naderi, Nima; Fallahazad, Parisa; Eshraghi, Mohamad Javad; Kolahi, Alireza

doi:10.1007/s11664-019-07484-0

Cited by 20 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the nanoscale, ZnO shows exceptional physicochemical properties that are beneficial in many industrial applications. Many researchers have successfully used ZnO nanostructures in photocatalytic [13][14][15][16], photovoltaic [17][18][19][20], biomedical [21][22][23][24] and sensing [25][26][27][28][29][30][31] applications, as it provides large surface area as compared to its bulk counterpart. The demand of highly efficient, durable and robust photocatalysts for wastewater treatment makes ZnO nanostructures a reliable candidate for photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

et al. 2019

View full text Add to dashboard Cite

This present study proposed a successful one pot synthesis of zinc oxide nanoparticles (ZnO NPs) and their optimisation for photocatalytic applications. Zinc chloride (ZnCl2) and sodium hydroxide (NaOH) were selected as chemical reagents for the proposed study. The design of this experiment was based on the reagents’ amounts and the ultrasonic irradiations’ time. The results regarding scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy confirmed the presence of ZnO NPs with pure hexagonal wurtzite crystalline structure in all synthesised samples. Photocatalytic activity of the developed samples was evaluated against methylene blue dye solution. The rapid removal of methylene blue dye indicated the higher photocatalytic activity of the developed samples than untreated samples. Moreover, central composite design was utilised for statistical analysis regarding the obtained results. A mathematical model for the optimisation of input conditions was designed to predict the results at any given point. The role of crystallisation on the photocatalytic performance of developed samples was discussed in detail in this novel study.

show abstract

Section: Introductionmentioning

confidence: 99%

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

et al. 2019

View full text Add to dashboard Cite

show abstract

“…This study represents an excellent premise to obtain less expensive photo catalysts using ZnO and Li 2 O to build heterogeneous structures to increase charge separation e ciency by creating photo catalysts with high e ciency and improved response capacity to visible light [35]. All results indicate that the sandwich structure of the ZnO: [38,39], the reason is to achieve good lateral conduction of electrons and holes through the material. Also, the electrochemical environment, the physical location (depth below surface) of the pn junction, and the thickness of the porous silicon lm proper were suitable for accomplishing different role of electrochemical etching conditions in the growth of (PSi) layers.…”

Section: Field Emission Scanning Electron Microscopy (Fesem)mentioning

confidence: 84%

Effect of Zinc Oxide on the Efficiency Enhancement of Al/Li2O/PSi/Si/Al solar cell

Al-Hussan

Bakr

Ahmed

2021

Preprint

View full text Add to dashboard Cite

In this paper, electrochemical etching of the p-type silicon wafer is used to prepare p-type porous silicon with current density of 10 mA.cm− 2 for 10 minutes. Field Emission Scanning Electron Microscopy (FESEM) has been used to study porous silicon layer surface morphology. Zinc oxide and lithium oxide nanoparticles are prepared separately by chemical precipitation method and simple precipitation method, respectively and deposited on glass substrates by drop casting method. Moreover,, the structural properties of the films were analyzed by using XRD and SEM. The XRD results showed that the ZnO and Li2O films are polycrystalline with hexagonal wurtzite structure and cubic structure, and preferred orientation along (101) and (003) planes, respectively. Using Scherrer's formula, the crystallite size was measured and it was found that ZnO and Li2O thin films have a crystallite size of 22.04 and 45.6 nm respectively. Surface topography of the prepared thin films is studied by using Scanning Electron Microscopy (SEM). Later, certain proportions of both materials were mixed and deposited on porous silicon using drop casting method at thickness of 1.4 µm. After that, the characteristics of the solar cell were investigated. Mixing zinc oxide nanoparticles in particular proportions with lithium oxide played a major role in increasing the solar cell's performance. The highest prepared film efficiency was obtained at mixing ratio (0.5: 0.5) for (ZnO: Li2O) and its value was (11.09 %).

show abstract

“…The gradual decomposition of ammonia and hexamethylenetetramine in the CBD reactor produced an alkaline medium and a specific OH − concentration required for the ZnO nucleation. Adjusting the chemical and physical parameters (e.g., precursors concentration, deposition time, temperature, and pH) optimized the chemical interactions with Zn 2+ ions provided by zinc nitrate [16].…”

Section: Synthesis Of Zno Nanorodsmentioning

confidence: 99%

Integrated photodetectors embedded within fiber laser based on hybrid rGO:ZnO nanostructures

Naderi,

Ahmad,

Ismail

2024

Phys. Scr.

View full text Add to dashboard Cite

Online power monitoring is helpful in fiber-optic communication applications. This report introduced an innovative all-fiber photodetector based on the polished side of an arc-shaped fiber for the optical signals' in situ measurements. For this purpose, a metal-semiconductor-metal photodetector was designed with multiple interdigitated metal fingers of gold electrodes. A waveguide structure containing polymethyl methacrylate (PMMA), graphene layers, and zinc oxide nanostructures was developed and covered over the arc-shaped fiber. Due to the PMMA's refractive index (n = 1.4905), the evanescent field of propagating mode was drawn out of the core, thus increasing the light interaction with semiconductor nanostructures. To study the influence of graphene flakes on the optoelectrical behavior of zinc oxide nanostructures, a suspension of graphene oxide (GO) and ZnO nanorods was synthesized and transferred onto the PMMA thin film, which was deposited on the polished side of the arc-shaped fiber. The morphological analysis indicates the formation of ZnO nanorods with different orientations, and these nanorods have the potential to enhance incident photon trapping greatly. Upon photon exposure, the guiding photons in the fiber evanescently coupled with the deposited nanostructures, and the photoexcited electron-hole pairs were generated in the semiconductor material. Using applied voltage across the interdigitated electrodes, the generated excitons were separated and increased the photocurrent, which was monitored precisely by source-measure equipment. The optoelectrical properties of fabricated devices showed that incorporating graphene layers can improve the photon detection performance of the fabricated all-fiber photodetectors based on ZnO nanostructures.

show abstract

Development and Optical Properties of ZnO Nanoflowers on Porous Silicon for Photovoltaic Applications

Cited by 20 publications

References 20 publications

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

Effect of Zinc Oxide on the Efficiency Enhancement of Al/Li2O/PSi/Si/Al solar cell

Integrated photodetectors embedded within fiber laser based on hybrid rGO:ZnO nanostructures

Contact Info

Product

Resources

About