Pub Date : 2023-02-20DOI: 10.15251/jor.2023.191.113
A. Almeshal, M. Musa Saad H.-E., B. Alsobhi
With the dawning of 21st century, governments faced three urgent challenges, global economic crisis, energy crisis and global warming. So, the research goals have directed on developing novel renewable-energy technologies as suitable alternative sources of the traditional energy that addresses these problems. Photovoltaic based solar cells technology gives sustainable solutions and depends on inorganic materials with specific properties. Among this family, halide perovskites (MBX3) have been investigated during the last five years. Besides studying their unique properties as flexible structures, high stability, tunable semiconductor band-gap (Eg 2.50 eV), high charge-carrier mobility and large optical absorption, research also seek for promising and multifaceted electroptical applications that give an amazing power efficiency (~24.0 %) in photovoltaic technology. The current challenge is to synthesis MBX3 materials provide suitable properties, include notable chemical stability at high temperatures, high electrical power efficiency, broad emission and tunable semiconducting Eg. Motivated by the site substitution effect, we extended this concept to build a series of cesium-metalloid MBX3 (M1+ = Cs; B2+ = Si, Ge, Sn, Pb; X– = Cl, Br, I), and investigate their structural, stability and optoelectronic properties. We expect these investigations will provide inspiration for an innovation of such MBX3 materials in photovoltaic applications.
{"title":"Cesium-metalloid halide perovskites MBX3 (M1+= Cs; B2+= Si, Ge, Sn, Pb; X–= Cl, Br, I) as semiconductor photovoltaic materials for sustainable renewable-energy applications","authors":"A. Almeshal, M. Musa Saad H.-E., B. Alsobhi","doi":"10.15251/jor.2023.191.113","DOIUrl":"https://doi.org/10.15251/jor.2023.191.113","url":null,"abstract":"With the dawning of 21st century, governments faced three urgent challenges, global economic crisis, energy crisis and global warming. So, the research goals have directed on developing novel renewable-energy technologies as suitable alternative sources of the traditional energy that addresses these problems. Photovoltaic based solar cells technology gives sustainable solutions and depends on inorganic materials with specific properties. Among this family, halide perovskites (MBX3) have been investigated during the last five years. Besides studying their unique properties as flexible structures, high stability, tunable semiconductor band-gap (Eg 2.50 eV), high charge-carrier mobility and large optical absorption, research also seek for promising and multifaceted electroptical applications that give an amazing power efficiency (~24.0 %) in photovoltaic technology. The current challenge is to synthesis MBX3 materials provide suitable properties, include notable chemical stability at high temperatures, high electrical power efficiency, broad emission and tunable semiconducting Eg. Motivated by the site substitution effect, we extended this concept to build a series of cesium-metalloid MBX3 (M1+ = Cs; B2+ = Si, Ge, Sn, Pb; X– = Cl, Br, I), and investigate their structural, stability and optoelectronic properties. We expect these investigations will provide inspiration for an innovation of such MBX3 materials in photovoltaic applications.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42145177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.15251/jor.2023.191.105
K. I. Hussein, R. A. Al-Qahtani, N. Alzedanie, S. Muhammad, M. Alqahtani, I. S. Asiri, M. Reben, E. Yousef
The novel glasses within composition: 62TeO2-5K2TeO3-20ZnO-10Nb2O5-3PbF2 and 62TeO2-5K2TeO3-20ZnO-10Nb2O5-3PbF2-2Er2O3 in mol% were fabricated by using meltquenching technique. The magnetic properties Viz; Faraday effect and the Verdet constant at wavelength of laser beam (λ = 632 nm) were measured. The prepared sample with doped Er3+ has the highest value of Verdet constant (= 0.104min/G.cm) which depends on the polarizability of Er3+ ions. Moreover, the optical properties of present glass estimated by using UV-Vis-NIR spectroscopy. The oxygen-packed densities, molar volumes, the polarizability of the oxygen molar volume, the linear refractive index (n), third-order nonlinear susceptibility, (3) , and nonlinear index (n2) of produced glasses were evaluation. It was found that the linear refractive index decreases otherwise the optical energy gap increased with doped Er3+ ions in the glasses network. Also, the Vickers microhardness increase with increasing Er2O3 in the glass matrix. Hence, these glasses may be use in optical isolator with high third-order non-linear susceptibility.
{"title":"Magneto-optic and mechanical properties of TeO2 with K2TeO3 doped with rare earth","authors":"K. I. Hussein, R. A. Al-Qahtani, N. Alzedanie, S. Muhammad, M. Alqahtani, I. S. Asiri, M. Reben, E. Yousef","doi":"10.15251/jor.2023.191.105","DOIUrl":"https://doi.org/10.15251/jor.2023.191.105","url":null,"abstract":"The novel glasses within composition: 62TeO2-5K2TeO3-20ZnO-10Nb2O5-3PbF2 and 62TeO2-5K2TeO3-20ZnO-10Nb2O5-3PbF2-2Er2O3 in mol% were fabricated by using meltquenching technique. The magnetic properties Viz; Faraday effect and the Verdet constant at wavelength of laser beam (λ = 632 nm) were measured. The prepared sample with doped Er3+ has the highest value of Verdet constant (= 0.104min/G.cm) which depends on the polarizability of Er3+ ions. Moreover, the optical properties of present glass estimated by using UV-Vis-NIR spectroscopy. The oxygen-packed densities, molar volumes, the polarizability of the oxygen molar volume, the linear refractive index (n), third-order nonlinear susceptibility, (3) , and nonlinear index (n2) of produced glasses were evaluation. It was found that the linear refractive index decreases otherwise the optical energy gap increased with doped Er3+ ions in the glasses network. Also, the Vickers microhardness increase with increasing Er2O3 in the glass matrix. Hence, these glasses may be use in optical isolator with high third-order non-linear susceptibility.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46861284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.193.295
A. Benmakhlouf, R. Makhloufi, A. Boutarfaia, B. Messai, F. Hadji, M. Nouiri
In this study PZT type ceramics with a general formula Pb1- xBax(Zr0.52Ti0.43(Al0.5Sb0.5)0.05)O3 where (x = 0.00, 0.04, and 0.08) were elaborated by the solid-state reaction and studied for their structural and dielectric properties in the region of the morphotropic phase boundary (MPB). Different techniques were used to characterize the obtained samples such as X-ray diffraction (XRD) which shows that the results confirm the high purity of prepared samples without any secondary phase and also indicate the coexistence of both the tetragonal and rhombohedral phases. All the absorption bands corresponding to the perovskite structure are exhibited by The Fourier Transform Infrared spectroscopy (FTIR). The scanning electronic microscopy (SEM) shows that the mean grain size was found between 2,84 and 2,14 µm, the Curie temperature (TC) decreased with increasing Ba2+ content. Furthermore, the effect of the temperature, frequency, and composition on the dielectric properties demonstrated a maximum value of the dielectric constant ε max = 38800 at 1 kHz when X= 0.08.
{"title":"The effect of Barium substitution on the structural and dielectric properties of Pb1-XBaX(Zr0.52Ti0.43(Al0.5Sb0.5)0.05)O3 ceramics at the morphotropic phase boundary","authors":"A. Benmakhlouf, R. Makhloufi, A. Boutarfaia, B. Messai, F. Hadji, M. Nouiri","doi":"10.15251/jor.2023.193.295","DOIUrl":"https://doi.org/10.15251/jor.2023.193.295","url":null,"abstract":"In this study PZT type ceramics with a general formula Pb1- xBax(Zr0.52Ti0.43(Al0.5Sb0.5)0.05)O3 where (x = 0.00, 0.04, and 0.08) were elaborated by the solid-state reaction and studied for their structural and dielectric properties in the region of the morphotropic phase boundary (MPB). Different techniques were used to characterize the obtained samples such as X-ray diffraction (XRD) which shows that the results confirm the high purity of prepared samples without any secondary phase and also indicate the coexistence of both the tetragonal and rhombohedral phases. All the absorption bands corresponding to the perovskite structure are exhibited by The Fourier Transform Infrared spectroscopy (FTIR). The scanning electronic microscopy (SEM) shows that the mean grain size was found between 2,84 and 2,14 µm, the Curie temperature (TC) decreased with increasing Ba2+ content. Furthermore, the effect of the temperature, frequency, and composition on the dielectric properties demonstrated a maximum value of the dielectric constant ε max = 38800 at 1 kHz when X= 0.08.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67050022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research presents a simulation study to achieve an optimized homojunction GaAs solar cell using SILVACO TCAD. A solar cell with configuration of p+ -AlGaAs as window, p-GaAs as emitter, n-GaAs as base and n+ -AlGaInP as BSF layer is proposed. The AlGaInP is selected as BSF layer due to high bandgap as compared to AlGaAs that is usually used in literature. Large scale of variation for doping concentration and thickness for all layers of cell have been simulated. The results show an improvement for solar cell parameters for the optimized cell as compared with the proposed one, where Jsc increases from 40.03 mA/cm2 to 52.58 mA/cm2 , Voc slightly increases from 0.94 V to 1 V, Pmax increases from 30.8 mW/cm2 to 46.86 mW/cm2 , FF increases from 82.19% to 88.54% and η increases from 22.29% to 33.94%. Which confirms the effectiveness of the doping concentration and thickness on solar cell performance.
{"title":"Superior efficiency for homojunction GaAs solar cell","authors":"A. Saif, M. Albishri, A. Mindil, M. Qaeed","doi":"10.15251/jor.2023.191.1","DOIUrl":"https://doi.org/10.15251/jor.2023.191.1","url":null,"abstract":"This research presents a simulation study to achieve an optimized homojunction GaAs solar cell using SILVACO TCAD. A solar cell with configuration of p+ -AlGaAs as window, p-GaAs as emitter, n-GaAs as base and n+ -AlGaInP as BSF layer is proposed. The AlGaInP is selected as BSF layer due to high bandgap as compared to AlGaAs that is usually used in literature. Large scale of variation for doping concentration and thickness for all layers of cell have been simulated. The results show an improvement for solar cell parameters for the optimized cell as compared with the proposed one, where Jsc increases from 40.03 mA/cm2 to 52.58 mA/cm2 , Voc slightly increases from 0.94 V to 1 V, Pmax increases from 30.8 mW/cm2 to 46.86 mW/cm2 , FF increases from 82.19% to 88.54% and η increases from 22.29% to 33.94%. Which confirms the effectiveness of the doping concentration and thickness on solar cell performance.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44962965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.191.15
H. K. Hassun, B. K. Al-Maiyaly, B. H. Hussein
This research including, CO3O4 was prepared by the chemical spry pyrolysis, deposited film acceptable to assess film properties and applications as photodetector devise, studying the optical and optoelectronics properties of Cobalt Oxide and effect of different doping ratios with Br (2, 5, 8)%. the optical energy gap for direct transition were evaluated and it decreases as the percentage Br increase, Hall measurements showed that all the films are p-type, the current–voltage characteristic of Br:CO3O4 /Si Heterojunction show change forward current at dark varies with applied voltage, high spectral response, specific detectivity and quantum efficiency of CO3O4 /Si detector with 8% of Br ,was deliberate, extreme value with 673nm.
{"title":"Manufacturing Br:CO3O4 /Si Heterojunction For Photodetector Applications","authors":"H. K. Hassun, B. K. Al-Maiyaly, B. H. Hussein","doi":"10.15251/jor.2023.191.15","DOIUrl":"https://doi.org/10.15251/jor.2023.191.15","url":null,"abstract":"This research including, CO3O4 was prepared by the chemical spry pyrolysis, deposited film acceptable to assess film properties and applications as photodetector devise, studying the optical and optoelectronics properties of Cobalt Oxide and effect of different doping ratios with Br (2, 5, 8)%. the optical energy gap for direct transition were evaluated and it decreases as the percentage Br increase, Hall measurements showed that all the films are p-type, the current–voltage characteristic of Br:CO3O4 /Si Heterojunction show change forward current at dark varies with applied voltage, high spectral response, specific detectivity and quantum efficiency of CO3O4 /Si detector with 8% of Br ,was deliberate, extreme value with 673nm.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46829703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.193.283
R. Jothiramalingam, T. Radika, H. Lohedan, M. Karnan, D. Al-Dhayan
Growing interest in the field of thermal energy conversion into useful electrical energy is the field of interest towards energy harvesting. Titania nanofluid prepared by low cost precursors using hydrothermal method. The physico chemical characterization of as prepared titania nanoparticle were characterized by XRD, Raman and UV-Visible spectrometric methods. The particle size measurement was determined via Zeta potential study. We have studied the miscibility and viscosity and sedimentation property of as prepared titanium dioxide nanofluid particles by low cost method in various mixed solvent medium. Nanofluids property with different concentration of TiO2 nanoparticles (0.01%, 0.02%, 0.04%, 0.05%, 0.1%, 0.2%, 0.5%) have been prepared by adding different concentrations and studied their physico-chemical properties. The as prepared TiO2 nanoparticles in the form fluid solution have shown very clear settled solution after the addition of suitable solvent medium and preparation method.
{"title":"Synthesis and characterization of TiO2 nano fluids formation and its optical, electrical and catalytic property analysis","authors":"R. Jothiramalingam, T. Radika, H. Lohedan, M. Karnan, D. Al-Dhayan","doi":"10.15251/jor.2023.193.283","DOIUrl":"https://doi.org/10.15251/jor.2023.193.283","url":null,"abstract":"Growing interest in the field of thermal energy conversion into useful electrical energy is the field of interest towards energy harvesting. Titania nanofluid prepared by low cost precursors using hydrothermal method. The physico chemical characterization of as prepared titania nanoparticle were characterized by XRD, Raman and UV-Visible spectrometric methods. The particle size measurement was determined via Zeta potential study. We have studied the miscibility and viscosity and sedimentation property of as prepared titanium dioxide nanofluid particles by low cost method in various mixed solvent medium. Nanofluids property with different concentration of TiO2 nanoparticles (0.01%, 0.02%, 0.04%, 0.05%, 0.1%, 0.2%, 0.5%) have been prepared by adding different concentrations and studied their physico-chemical properties. The as prepared TiO2 nanoparticles in the form fluid solution have shown very clear settled solution after the addition of suitable solvent medium and preparation method.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67048784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.191.65
H. Ali, N. Amin, M. Akhtar, M. Arshad, M. Athar, N. Morley, M. Yusaf, Z. Latif, K. Mehmood
The Nickel substituted Cu-Co-Zn-Ce nano ferrites, Zn0.15Co0.45Cu0.40-xNix Fe1.85Ce0.15O4 with x=0, 0.1, 0.20, 0.30, 0.40, were synthesized using the coprecipitation technique. The sample were sintered at 900 ℃ for 5h. The structural, electrical, dielectric and magnetic properties of all the prepared samples were characterized by XRD, SMU2401, UV-Vis and FTIR. The powder X-ray diffraction patterns of all the prepared samples confirmed the formation of single-phase cubic spinel structures. These samples further characterized for the electrical properties by using two-probe type method. The DC resistivity of all the ferrite composition decreased as the temperature increased, showing their semiconductor nature. UV-Vis and FTIR confirmed the substitution of nickel in Cu-Co-Zn-Ce ferrites. From UV-Vis it is observed that the optical band gap changes from 3.9 eV to 5.3 eV with addition of Ni. FTIR analysis revealed that a strong variation on tetrahedral absorption frequency band is present which is due to the replacement of Ni on Cu. All these results suggested that these materials can be used for wastewater treatment.
{"title":"Synthesis and characterizations of nickel doped Co-Zn-Y ferrites","authors":"H. Ali, N. Amin, M. Akhtar, M. Arshad, M. Athar, N. Morley, M. Yusaf, Z. Latif, K. Mehmood","doi":"10.15251/jor.2023.191.65","DOIUrl":"https://doi.org/10.15251/jor.2023.191.65","url":null,"abstract":"The Nickel substituted Cu-Co-Zn-Ce nano ferrites, Zn0.15Co0.45Cu0.40-xNix Fe1.85Ce0.15O4 with x=0, 0.1, 0.20, 0.30, 0.40, were synthesized using the coprecipitation technique. The sample were sintered at 900 ℃ for 5h. The structural, electrical, dielectric and magnetic properties of all the prepared samples were characterized by XRD, SMU2401, UV-Vis and FTIR. The powder X-ray diffraction patterns of all the prepared samples confirmed the formation of single-phase cubic spinel structures. These samples further characterized for the electrical properties by using two-probe type method. The DC resistivity of all the ferrite composition decreased as the temperature increased, showing their semiconductor nature. UV-Vis and FTIR confirmed the substitution of nickel in Cu-Co-Zn-Ce ferrites. From UV-Vis it is observed that the optical band gap changes from 3.9 eV to 5.3 eV with addition of Ni. FTIR analysis revealed that a strong variation on tetrahedral absorption frequency band is present which is due to the replacement of Ni on Cu. All these results suggested that these materials can be used for wastewater treatment.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43424458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.191.31
J. Yuan, J. S. Wang, S. Q. Liu, H. Zhao, P. Wang, X. Deng
This work combines the advantages of SnS and CZTSSe to constitute the SnS/CZTSSe heterojunction solar cells, and the effects of various factors on cell performance were studied by using numerical simulation. The results show that the optimal thickness of CZTSSe and SnS are 0.1 μm and 2.0 μm, respectively. Furthermore, the optimal doping concentrations of CZTSSe and SnS are 1×1017 cm-3 and 1×1016 cm-3 , respectively. In addition, defect states have little impacts on the cell performance when the density of Gaussian defect states of CZTSSe and SnS are less than 1×1016 cm-3 and 1×1014 cm-3 , respectively, and the density of tail defect states of these two materials are both less than 1×1019 cm-3 eV-1 . Moreover, the potential conversion efficiency of the SnS/CZTSSe heterojunction solar cells can reach 23.92%. Therefore, the SnS/CZTSSe heterojunction solar cell may be a promising photovoltaic structure
{"title":"Numerical simulation of SnS/CZTSSe heterojunction solar cells","authors":"J. Yuan, J. S. Wang, S. Q. Liu, H. Zhao, P. Wang, X. Deng","doi":"10.15251/jor.2023.191.31","DOIUrl":"https://doi.org/10.15251/jor.2023.191.31","url":null,"abstract":"This work combines the advantages of SnS and CZTSSe to constitute the SnS/CZTSSe heterojunction solar cells, and the effects of various factors on cell performance were studied by using numerical simulation. The results show that the optimal thickness of CZTSSe and SnS are 0.1 μm and 2.0 μm, respectively. Furthermore, the optimal doping concentrations of CZTSSe and SnS are 1×1017 cm-3 and 1×1016 cm-3 , respectively. In addition, defect states have little impacts on the cell performance when the density of Gaussian defect states of CZTSSe and SnS are less than 1×1016 cm-3 and 1×1014 cm-3 , respectively, and the density of tail defect states of these two materials are both less than 1×1019 cm-3 eV-1 . Moreover, the potential conversion efficiency of the SnS/CZTSSe heterojunction solar cells can reach 23.92%. Therefore, the SnS/CZTSSe heterojunction solar cell may be a promising photovoltaic structure","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49244617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.191.53
B. Amudhavalli, R. Mariappan, M. Prasath
The Zinc Oxide (ZnO) thin films have been deposited on glass substrate at different temperature from 300 to 500 o C by nebulizer spray pyrolysis technique. The prepared films were characterized by X-Ray diffraction (XRD), High resolution scanning electron microscope (HRSEM), Energy dispersive analysis by X-rays (EDAX), Photoluminescence (PL), UV-Vis-NIR spectrometer and impedance spectroscopy, respectively. The XRD confirms that the films are polycrystalline in nature with hexagonal wurtzite crystal structure with (002) plane as preferential orientation. The various parameters such as crystallite size, micro strain, and dislocation density were calculated from X-ray diffraction. HR-SEM images show smooth, tiny grains and dense morphology. The PL studies exhibits two emission peaks one at 389 nm corresponding to band gap excitonic emission and another located at 490 nm due to the presence of singly ionized oxygen vacancies. The UV-Vis-NIR spectrometer confirms the possibility of good transparent ZnO films with an average transmission of about ~85-95% in the visible region and optical band gap shifted from 3.37 eV to 3.2 eV with increase in temperature and which is supported by PL study. The semiconductor bahaviour and activation energy of these films have been confirmed by impedance spectroscopy measurements.
{"title":"Low-cost nebulizer spray deposited conduction mechanism of thin film ZnO nanoparticles","authors":"B. Amudhavalli, R. Mariappan, M. Prasath","doi":"10.15251/jor.2023.191.53","DOIUrl":"https://doi.org/10.15251/jor.2023.191.53","url":null,"abstract":"The Zinc Oxide (ZnO) thin films have been deposited on glass substrate at different temperature from 300 to 500 o C by nebulizer spray pyrolysis technique. The prepared films were characterized by X-Ray diffraction (XRD), High resolution scanning electron microscope (HRSEM), Energy dispersive analysis by X-rays (EDAX), Photoluminescence (PL), UV-Vis-NIR spectrometer and impedance spectroscopy, respectively. The XRD confirms that the films are polycrystalline in nature with hexagonal wurtzite crystal structure with (002) plane as preferential orientation. The various parameters such as crystallite size, micro strain, and dislocation density were calculated from X-ray diffraction. HR-SEM images show smooth, tiny grains and dense morphology. The PL studies exhibits two emission peaks one at 389 nm corresponding to band gap excitonic emission and another located at 490 nm due to the presence of singly ionized oxygen vacancies. The UV-Vis-NIR spectrometer confirms the possibility of good transparent ZnO films with an average transmission of about ~85-95% in the visible region and optical band gap shifted from 3.37 eV to 3.2 eV with increase in temperature and which is supported by PL study. The semiconductor bahaviour and activation energy of these films have been confirmed by impedance spectroscopy measurements.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49508962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.15251/jor.2023.193.265
M. Myvizhi, K. Satheesh kumar, P. Kavitha, P. Selvakumar
This study uses the CASTEP code and the density functional theory (DFT) to look into the structure, electrical properties, and optical properties of MgO. The generalised gradient approximation (GGA-PW91 approximation) was used to measure both the energy of the band gap and the energy of the exchange-correlation. This computation was done based on the cubic MgO crystal structure, which has a space group of Fm-3m and a 3x3x3 supercell. In structural optimization, the results that are expected for the lattice constant and the bulk modulus elastic constant are very close to known experiments and theories. The anticipated direct band gap of 4.283eV at the G point is in excellent agreement with the results of the tests. Also, the total (DOS) and partial (PDOS) densities of states have been measured, and the results of the absorption coefficient have been looked at in terms of the different energies of the phonons that hit the material.
{"title":"Structure and opto-electronic properties of MgO nanocrystals calculated by GGA approximation","authors":"M. Myvizhi, K. Satheesh kumar, P. Kavitha, P. Selvakumar","doi":"10.15251/jor.2023.193.265","DOIUrl":"https://doi.org/10.15251/jor.2023.193.265","url":null,"abstract":"This study uses the CASTEP code and the density functional theory (DFT) to look into the structure, electrical properties, and optical properties of MgO. The generalised gradient approximation (GGA-PW91 approximation) was used to measure both the energy of the band gap and the energy of the exchange-correlation. This computation was done based on the cubic MgO crystal structure, which has a space group of Fm-3m and a 3x3x3 supercell. In structural optimization, the results that are expected for the lattice constant and the bulk modulus elastic constant are very close to known experiments and theories. The anticipated direct band gap of 4.283eV at the G point is in excellent agreement with the results of the tests. Also, the total (DOS) and partial (PDOS) densities of states have been measured, and the results of the absorption coefficient have been looked at in terms of the different energies of the phonons that hit the material.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67047715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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