Effect of Laser Fluence on the Structural, Morphological and Optical Properties of 2H-PbI2 Nanoparticles Prepared by Laser Ablation in Ethanol

Ismail, Raid A.; Mousa, Ali M.; Amin, Mustafa H.

doi:10.1007/s10904-018-0908-6

Cited by 20 publications

(3 citation statements)

References 33 publications

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“…The shift in peak of response after increasing the temperature to 100 °C can be attributed to the increase in the depletion layer thickness moving toward the BaTiO 3 film and quantum size effect 53 , thereby enhancing the detection of short wavelengths. The presence of bias voltage plays a crucial role in increasing the responsivity by preventing e-h recombination and widening the depletion region width [54][55][56] .…”

Section: Resultsmentioning

confidence: 99%

Role of substrate temperature on the performance of BaTiO3/Si photodetector prepared by pulsed laser deposition

Abed,

Ismail,

Shaker

2024

Sci Rep

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In this study, the pulsed laser deposition (PLD) method was employed to fabricate nanostructured BaTiO3 films on glass and silicon substrates at varying temperatures. The structural analysis confirmed the formation of crystalline nanostructured BaTiO3 with mixed tetragonal and hexagonal phases, and the film deposited at 150 °C has the best crystallinity and largest particle size. The optical energy gap of the BaTiO3 nanostructure decreases from 3.94 to 3.84 eV, with increasing substrate temperature from 60 to 150 °C. Photoluminescence spectra of BaTiO3 films deposited at 25, 60, 100, and 150 °C exhibit emission peaks centered at 450, 512, 474, and 531 nm, respectively. Raman spectra of BaTiO3 films show E (LO), A (TO), E (LO) + TO, and B1 vibration modes. Hall measurements reveal that the mobility of the BaTiO3 film increases with temperature up to 100 °C and then decreases at 150 °C. The current–voltage characteristics of the BaTiO3/p-Si heterojunction, deposited over a temperature range of 25 to 150 °C, were investigated in the dark and under illumination. The heterojunctions exhibit rectifying properties, with the best rectification factor observed for the heterojunction prepared at 100 °C. The values of the ideality factor for the heterojunctions fabricated at 25, 60, 100, and 150 °C were 4.3, 3.8, 2.8, and 5, respectively. The study reveals an improvement in both the figures of merit and the photodetector performance with increased substrate temperature. The responsivity increases from 2.2 to 9.25 A/W as the deposition temperature rises from 25 to 100 °C. The detectivity (D*) and external quantum efficiency (EQE) of the photodetector prepared at the optimum substrate temperature of 100 °C, were found to be 4.62 × 1012 Jones and 114%, respectively, at 500 nm.

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Section: Resultsmentioning

confidence: 99%

Role of substrate temperature on the performance of BaTiO3/Si photodetector prepared by pulsed laser deposition

Abed,

Ismail,

Shaker

2024

Sci Rep

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“…These properties make boron carbide thin films attractive candidates for applications in the fields of coating materials, electronics, and neutron detectors 5 . Semiconductor nanoparticles (NPs) are very interesting materials because they have unique physical, optical, and electrical properties compared to the bulk material 6 . Various methods were used to prepare boron carbide, such as RF sputtering, pulsed laser deposition, ball milling plasma chemical synthesis, liquid phase reaction, vapor phase reaction, porous alumina template technique, electrostatic pinning, microwave carbo thermal reduction, and metallothermic reduction 7 , 8 , radio-Frequency Plasma Enhanced Chemical Vapour Deposition (RF-PECVD) 9 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of novel B4C nanostructure/Si photodetectors by laser ablation in liquid

Hamd

Ramizy

Ismail

2022

Sci Rep

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In this study, boron carbide (B4C) nanoparticles (NPs) are synthesized by pulsed laser ablation of boron in ethanol at a laser fluence of 6.36 J cm−2 pulse−1. The effect of numbers of laser pulses on the structural, optical, and electrical properties of B4C NPs was studied. X-ray diffraction (XRD) results revealed that all B4C nanoparticles synthesized were polycrystalline in nature with a rhombohedral structure. When the laser pulses increased from 500 to 1500, the optical band gap of B4C decreased from 2.45 to 2.38 eV. Fluorescence measurements showed the emission of two emission peaks. The Raman spectra of B4C nanoparticles exhibit six vibration modes centered at 270, 480, 533, 722, 820, and 1080 cm−1. Field emission scanning electron microscope (FESEM) images show the formation of spherical nanoparticles of an average size of 68, 75, and 84 nm for samples prepared at 500, 1000, and 1500 pulses, respectively. The dark I–V characteristics of B4C/Si heterojunction photodetectors showed rectification characteristics, and the heterojunction prepared at 500 pulses exhibits the best junction characteristics. The illuminated I–V characteristics of B4C/p-Si heterojunction photodetectors exhibited high photosensitivity to white light. The spectral responsivity of the p-B4C/p-Si photodetector shows that the maximum responsivity was 0.66 A W−1 at 500 nm for a photodetector prepared at 500 pulses. The highest specific detectivity and quantum efficiency were 2.18 × 1012 Jones and 1.64 × 102% at 550 nm, respectively, for a heterojunction photodetector fabricated at 500 pulses, The ON/OFF ratio, rise time, and fall time are measured as a function of the number of laser pulses. The photodetector fabricated at 1500 laser pulses showed roughly rise and fall intervals of 1.5 and 0.8 s, respectively.

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“…In case of PLAL techniques, laser parameters (such as wavelength, pulse duration, laser energy) and the liquid environment (solvent, temperature, surfactant for instance) are the key points to optimize as reported in Table 1. Larger NPs with increase laser fluence 8 Increase of the size distribution with fs and ps lasers 9 Small increase of the size distribution with rep. rate 10 Higher yield for increase absorption 11 With the increasing need of nanoparticles to be used in various applications, more and more researches focus on rare-earth doped nanoparticles. Rare-earth and transition metal doped nanoparticles present good photostability and wide possible optical features including the well-known up-conversation, down-conversation and persistent luminescence processes 12 .…”

Section: Introductionmentioning

confidence: 99%

SrAl2O4: Eu2+, Dy3+ doped-nanoparticles prepared by pulsed laser ablation in liquids

Castaing

Guo

et al. 2020

Oxide-Based Materials and Devices XI

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SrAl2O4: Eu 2+ , Dy 3+ nanoparticles prepared by pulsed laser ablation in liquids (PLAL) could be a green and versatile technique to obtain inorganic nanoparticles with persistent luminescence and different morphologies and sizes. Laser ablation technique could deliver large amounts of energy highly concentrated into one point of a material and has been carried out in vacuum, in air and in liquids. Because of the unique confinement effect from liquid environment, there is many advantages when the laser ablation occurs in liquid. In this paper, we focus on the control of the size through proper laser parameters, choice of the reaction solution. Persistent luminescent SrAl2O4: Eu 2+ , Dy 3+ phosphor was obtained by laser ablation in liquids.

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Effect of Laser Fluence on the Structural, Morphological and Optical Properties of 2H-PbI2 Nanoparticles Prepared by Laser Ablation in Ethanol

Cited by 20 publications

References 33 publications

Role of substrate temperature on the performance of BaTiO3/Si photodetector prepared by pulsed laser deposition

Role of substrate temperature on the performance of BaTiO3/Si photodetector prepared by pulsed laser deposition

Preparation of novel B4C nanostructure/Si photodetectors by laser ablation in liquid

SrAl2O4: Eu2+, Dy3+ doped-nanoparticles prepared by pulsed laser ablation in liquids

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