White, blue and green emission from Si QDs derived from zinc incorporated porous silicon

Almomani, Mohammad S.; Ahmed, Naser M.; Rashid, Marzaini; Almessiere, M.A.; Altowyan, Abeer S.

doi:10.1016/j.jlumin.2020.117845

Cited by 8 publications

(6 citation statements)

References 41 publications

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“…The P-Si layer revealed indirectly to direct band gap energy transition due to the quantum confinement effect, which was due to the shrinkage of Si particle size below 5 nm [35,36]. The value of 𝐸𝑔 for PSi (~2.78 eV) was comparable with the one obtained previously (2.2 eV) from the photoluminescence spectral analyses [37][38][39]. The solar simulator was used to determine the cell characterization, which gives the value automatically.…”

Section: Resultssupporting

confidence: 68%

Photovoltaic Performance of Spherical TiO2 Nanoparticles Derived from Titanium Hydroxide Ti(OH)4: Role of Annealing Varying Temperature

et al. 2022

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High-quality titanium dioxide (TiO2 or titania) nanoparticles (TiO2NPs) with tailored morphologies are desirable for efficient photovoltaic applications. In this view, some thin films containing spherical TiO2NPs were prepared on indium tin oxide (ITO) and silicon (Si) substrates from titanium hydroxide Ti(OH)4 using the unified sol-gel, spray and spin coating method followed by thermal annealing at different temperatures (in the range of 200–650 °C). Samples were characterized using various analytical tools to determine the influence of annealing temperatures on their structures, morphologies, and optical and photovoltaic characteristics. A field-emission scanning electron microscope (FESEM) and energy-filtered transmission electron microscopy (EFTEM) images of the annealed films displayed the existence of spherical TiO2NPs of average size in the range of 3.2 to 33.94 nm. XRD analysis of the films showed their amorphous nature with anatase and rutile phase. Optical UV-Vis spectral analysis of the annealed films exhibited a decrease in the bandgap energy from 3.84 to 3.24 eV with the corresponding increase of annealing temperature from 200 to 650 °C. The optimum films obtained at 500 and 600 °C were utilized as electron transport layers to fabricate the metal-insulator-semiconductor solar cells. The cells’ power conversion efficiency assembled with the spherical TiO2NPs-enclosed thin films annealed at 500 and 600 °C were 1.02 and 0.28%, respectively. Furthermore, it was shown that the overall properties and photovoltaic performance of the TiO2NPs-based thin films could be improved via thermal annealing.

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Section: Resultssupporting

confidence: 68%

Photovoltaic Performance of Spherical TiO2 Nanoparticles Derived from Titanium Hydroxide Ti(OH)4: Role of Annealing Varying Temperature

et al. 2022

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“…High-purity (99.99%) chemical reagents of hydrogen fluoride (HF), ethanol (C 2 H 5 OH), zinc (Zn) powder, acetone (C 3 H 6 O), NH 4 OH (28.0 to 30.0%) were purchased from Sigma-Aldrich Chemical Co. (St. Louis, MI, USA). n-type Si (100) (thickness and resistivity in the range of 355-405 µm, and 0.002-0.005 Ω.cm, respectively) were used to synthesize the PSi incorporated with Zn (ZnPSi) and colloidal Si quantum dots (SiQDs) combined with zinc (ZnSiQDs following the method prescribed in [9,16].…”

Section: Methodsmentioning

confidence: 99%

“…N-type (100) Si wafer was cut via a diamond cutter in rectangles of dimensions 1.5 cm × 2.5 cm 2 . The Radio Corporation of America (RCA) process was used to clean and remove the native oxide from the Si chips [16]. In the ring-etching cell (made of Teflon), the Zn powder of mass of 0.17 g was added in a mixture of HF and ethanol at a volume ratio of 1:1.…”

Section: Preparation Of Znpsi and Suspension Znsiqds In The Presence/absence Of Nh 4 Ohmentioning

confidence: 99%

“…Despite many dedicated efforts, the production of high-quality ZnO incorporated core-shell SiQDs (ZnSiQDs) with customized properties remains challenging. This motivates us, in this work, to prepare ZnSiQDs in acetone using electrochemical etching of a Si wafer following the protocols referred to in [16]. The influence of different amounts of NH 4 OH addition (15 to 25 µL) on the morphology and optical (room temperature absorbance and PL emission) characteristics of the as-prepared ZnSiQD suspension were evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

et al. 2021

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Despite many dedicated efforts, the fabrication of high-quality ZnO-incorporated Zinc@Silicon (Zn@Si) core–shell quantum dots (ZnSiQDs) with customized properties remains challenging. In this study, we report a new record for the brightness enhancement of ZnSiQDs prepared via a unified top-down and bottom-up strategy. The top-down approach was used to produce ZnSiQDs with uniform sizes and shapes, followed by the bottom-up method for their re-growth. The influence of various NH4OH contents (15 to 25 µL) on the morphology and optical characteristics of ZnSiQDs was investigated. The ZnSiQDs were obtained from the electrochemically etched porous Si (PSi) with Zn inclusion (ZnPSi), followed by the electropolishing and sonication in acetone. EFTEM micrographs of the samples prepared without and with NH4OH revealed the existence of spherical ZnSiQDs with a mean diameter of 1.22 to 7.4 nm, respectively. The emission spectra of the ZnSiQDs (excited by 365 nm) exhibited bright blue, green, orange-yellow, and red luminescence, indicating the uniform morphology related to the strong quantum confinement ZnSiQDs. In addition, the absorption and emission of the ZnSiQDs prepared with NH4OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH4OH was approximately 3.6 and 2.3 eV, respectively.

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“…The P-Si was fabricated using the electrochemical etching technique. In the fabrication process, the optimal parameters were applied [ 29 ]. First, a 400 μm thick, n-type Si peace with an area of 1 cm 2 and resistivities between 1 and 10 Ω.cm.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Deposition of Silver Nanowires on Porous Silicon as an Ultraviolet Light Photodetector

et al. 2023

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The applications of silver nanowires (AgNWs) are clearly relevant to their purity and morphology. Therefore, the synthesis parameters should be precisely adjusted in order to obtain AgNWs with a high aspect ratio. Consequently, controlling the reaction time versus the reaction temperature of the AgNWs is crucial to synthesize AgNWs with a high crystallinity and is important in fabricating optoelectronic devices. In this work, we tracked the morphological alterations of AgNWs during the growth process in order to determine the optimal reaction time and temperature. Thus, here, the UV–Vis absorption spectra were used to investigate how the reaction time varies with the temperature. The reaction was conducted at five different temperatures, 140–180 °C. As a result, an equation was developed to describe the relationship between them and to calculate the reaction time at any given reaction temperature. It was observed that the average diameter of the NWs was temperature-dependent and had a minimum value of 23 nm at a reaction temperature of 150 °C. A significant purification technique was conducted for the final product at a reaction temperature of 150 °C with two different speeds in the centrifuge to remove the heavy and light by-products. Based on these qualities, a AgNWs-based porous Si (AgNWs/P-Si) device was fabricated, and current-time pulsing was achieved using an ultra-violet (UV) irradiation of a 375 nm wavelength at four bias voltages of 1 V, 2 V, 3 V, and 4 V. We obtained a high level of sensitivity and detectivity with the values of 2247.49% and 2.89 × 1012 Jones, respectively. The photocurrent increased from the μA range in the P-Si to the mA range in the AgNWs/P-Si photodetector due to the featured surface plasmon resonance of the AgNWs compared to the other metals.

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White, blue and green emission from Si QDs derived from zinc incorporated porous silicon

Cited by 8 publications

References 41 publications

Photovoltaic Performance of Spherical TiO2 Nanoparticles Derived from Titanium Hydroxide Ti(OH)4: Role of Annealing Varying Temperature

Photovoltaic Performance of Spherical TiO2 Nanoparticles Derived from Titanium Hydroxide Ti(OH)4: Role of Annealing Varying Temperature

Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

Synthesis and Deposition of Silver Nanowires on Porous Silicon as an Ultraviolet Light Photodetector

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