Pub Date : 2023-11-01DOI: 10.15251/jor.2023.196.615
K. A. Mohammed, K. H. Salem, M. F. Jawaad, M. A. Alkhafaji, R. S. Zabibah
This study presents the synthesis of a novel ovonic nanomaterial by the chemical route approach, involving the combination of three distinct materials: polyvinyl alcohol (PVA), iron oxide (Fe2O3), and selenium (Se) nanoparticles. The produced material underwent evaluation using various analytical techniques, including Xray diffraction (XRD), energydispersive Xray spectroscopy (EDS), scaning electron microscope (SEM), and UV-Visible spectrophotometer. The focus of the work revolved around a unique hybrid structure consisting of selenium nanoparticles that were embedded within a polyvinyl alcohol and iron(III) oxide. The examination of micro structure information yielded findings that support the notion that Se nanoparticles have an impact on the structural properties of PVA/Fe2O3. (XRD) and (EDS) examines provided confirmation of the formation of a novel composite structure. The produced composites had notable absorption peaks at a wavelength of 530 nm for PVA-Fe2O3-CdZnS. These composites exhibited a progressive transition towards absorption in higher wavelength areas. The composite material that has been suggested for potential utilization in forthcoming energy storage applications.
{"title":"Designing and studying of PVA/Fe2O3/Se as new ovonic material for possible storage application","authors":"K. A. Mohammed, K. H. Salem, M. F. Jawaad, M. A. Alkhafaji, R. S. Zabibah","doi":"10.15251/jor.2023.196.615","DOIUrl":"https://doi.org/10.15251/jor.2023.196.615","url":null,"abstract":"This study presents the synthesis of a novel ovonic nanomaterial by the chemical route approach, involving the combination of three distinct materials: polyvinyl alcohol (PVA), iron oxide (Fe2O3), and selenium (Se) nanoparticles. The produced material underwent evaluation using various analytical techniques, including Xray diffraction (XRD), energydispersive Xray spectroscopy (EDS), scaning electron microscope (SEM), and UV-Visible spectrophotometer. The focus of the work revolved around a unique hybrid structure consisting of selenium nanoparticles that were embedded within a polyvinyl alcohol and iron(III) oxide. The examination of micro structure information yielded findings that support the notion that Se nanoparticles have an impact on the structural properties of PVA/Fe2O3. (XRD) and (EDS) examines provided confirmation of the formation of a novel composite structure. The produced composites had notable absorption peaks at a wavelength of 530 nm for PVA-Fe2O3-CdZnS. These composites exhibited a progressive transition towards absorption in higher wavelength areas. The composite material that has been suggested for potential utilization in forthcoming energy storage applications.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135615820","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 : 2023-11-01DOI: 10.15251/jor.2023.196.623
M. H. Mustafa, A. A. Shihab
At a substrate temperature of 320 o C, a chemical spray pyrolysis approach was applied. to create tungsten oxide thin films on glass substrates with varying Au nanoparticle doping concentrations (0, 0.04 and 0.08 M) that have a thickness of roughly 250 nm. Investigated were the structural and optical characteristics. The films were amorphous to the pure films at the substrate temperature (320 °C), according to X-ray diffraction and remain so even after adding GNPs, because the WO3 structure is amorphous in all samples, whereas the cubic structure of the gold nanoparticles. The morphology of the films was examined using atomic force microscopy (AFM), which showed a decrease in the grain size of the films doped with gold compared to the thin films before the doping process. a UV-Vis spectrophotometer was used to examine the membranes' optical characteristics between the wavelengths of (300-1000) nm. was the optical energy gap of the films (3.23) eV for tungsten oxide film and decreased after adding nanoscale gold to (3.04, 2.95) eV for films doped with different proportions of Au NPs (0.04, 0.08 M), respectively. Hall testing confirms that with 8 (mM) Gold (Au) doping, WO3 material of the n type was obtained with a maximum carrier mobility of 219.92(cm2 /Vs) and conductivity of 6.52 (Ω.cm)-1 . The I-V characteristics of the photovoltaic formed under illumination were determined by measuring the incident power density (100 mW/cm2 ) at varied Au doping levels.
{"title":"Effect of ratio gold nanoparticles on the properties and efficiency photovoltaic of thin films of amorphous tungsten trioxide","authors":"M. H. Mustafa, A. A. Shihab","doi":"10.15251/jor.2023.196.623","DOIUrl":"https://doi.org/10.15251/jor.2023.196.623","url":null,"abstract":"At a substrate temperature of 320 o C, a chemical spray pyrolysis approach was applied. to create tungsten oxide thin films on glass substrates with varying Au nanoparticle doping concentrations (0, 0.04 and 0.08 M) that have a thickness of roughly 250 nm. Investigated were the structural and optical characteristics. The films were amorphous to the pure films at the substrate temperature (320 °C), according to X-ray diffraction and remain so even after adding GNPs, because the WO3 structure is amorphous in all samples, whereas the cubic structure of the gold nanoparticles. The morphology of the films was examined using atomic force microscopy (AFM), which showed a decrease in the grain size of the films doped with gold compared to the thin films before the doping process. a UV-Vis spectrophotometer was used to examine the membranes' optical characteristics between the wavelengths of (300-1000) nm. was the optical energy gap of the films (3.23) eV for tungsten oxide film and decreased after adding nanoscale gold to (3.04, 2.95) eV for films doped with different proportions of Au NPs (0.04, 0.08 M), respectively. Hall testing confirms that with 8 (mM) Gold (Au) doping, WO3 material of the n type was obtained with a maximum carrier mobility of 219.92(cm2 /Vs) and conductivity of 6.52 (Ω.cm)-1 . The I-V characteristics of the photovoltaic formed under illumination were determined by measuring the incident power density (100 mW/cm2 ) at varied Au doping levels.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"56 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135615193","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 : 2023-11-01DOI: 10.15251/jor.2023.196.607
A. Missoum, N. G. Sabri, M. Daoudi, H. Guedaouria, A. Benamara
In this work, we focused on investigating the eigen frequency and internal standing wave characteristics of a vertical surface cavity emitting laser operating at a wavelength of 1.55 µm. The design of the cavity involved determining the cavity length, selecting the material for the cavity spacer, and carefully placing the quantum wells within the cavity to achieve maximum overlap with the electric field. In our case, the choice of the dielectric Bragg mirror with SiO2/TiO2 layers helps in achieving high reflectivity and low optical losses. The quantum wells are strategically placed within the cavity to ensure maximum overlap with the electric field. This allows for efficient carrier injection and recombination, leading to laser emission. The specific composition of the quantum wells, In0.54Ga0.46As0.99P0.01 / In0.75Ga0.25As0.55P0.45, indicates the proportions of indium (In), gallium (Ga), arsenic (As), and phosphorus (P) in the material. These compositions are chosen to achieve the desired electronic band structure and emission wavelength. By studying the eigen frequency and internal standing waves in our designed laser cavity, our aim is to understand the resonant modes and behavior of light within the device. This knowledge is crucial for optimizing the laser's performance and improving its efficiency for various applications.
{"title":"Study of eigen frequency In1-xGaxAsyP1-y 1.55 µm VCSEL with SiO2 /TiO2 dielectric Bragg reflector","authors":"A. Missoum, N. G. Sabri, M. Daoudi, H. Guedaouria, A. Benamara","doi":"10.15251/jor.2023.196.607","DOIUrl":"https://doi.org/10.15251/jor.2023.196.607","url":null,"abstract":"In this work, we focused on investigating the eigen frequency and internal standing wave characteristics of a vertical surface cavity emitting laser operating at a wavelength of 1.55 µm. The design of the cavity involved determining the cavity length, selecting the material for the cavity spacer, and carefully placing the quantum wells within the cavity to achieve maximum overlap with the electric field. In our case, the choice of the dielectric Bragg mirror with SiO2/TiO2 layers helps in achieving high reflectivity and low optical losses. The quantum wells are strategically placed within the cavity to ensure maximum overlap with the electric field. This allows for efficient carrier injection and recombination, leading to laser emission. The specific composition of the quantum wells, In0.54Ga0.46As0.99P0.01 / In0.75Ga0.25As0.55P0.45, indicates the proportions of indium (In), gallium (Ga), arsenic (As), and phosphorus (P) in the material. These compositions are chosen to achieve the desired electronic band structure and emission wavelength. By studying the eigen frequency and internal standing waves in our designed laser cavity, our aim is to understand the resonant modes and behavior of light within the device. This knowledge is crucial for optimizing the laser's performance and improving its efficiency for various applications.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"2019 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135614423","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 : 2023-10-01DOI: 10.15251/jor.2023.195.587
H. Al-Dmour, D.M. Taylor
This work studies the influence of the properties of nanocrystalline -titanium dioxide (ncTiO2) films on the performance of solar cells based on the Organic materials/ncTiO2 multilayer structure. That was investigated using X-ray diffraction, Atomic force microscopy (AFM), and Source-Measure Unit(SMU) under different ambient conditions. The device produced from batch A exhibit better performance compared to the device produced from batch B. The short circuit current, Jsc, increases from 0.03 mA/cm2 to 0.22 mA/cm2 , and the power conversion efficiency, η, from 0.01% to 0.09% in comparison between batches A and B solar cells. That is attributed to the grains of batch A nc-TiO2 having a size of 25 nm and a height of 100 nm, while particles of batch B nc-TiO2 film have a height of 40 nm and a size of 19 nm. These features cause to increase in the resistance and defects throughout the bulk region and interfaces of Batch B solar cells and impact the mechanism processes of charge generation of solar cells.
{"title":"Effect of properties of NC-TiO2 grains on the performance of organic/inorganic solar cells","authors":"H. Al-Dmour, D.M. Taylor","doi":"10.15251/jor.2023.195.587","DOIUrl":"https://doi.org/10.15251/jor.2023.195.587","url":null,"abstract":"This work studies the influence of the properties of nanocrystalline -titanium dioxide (ncTiO2) films on the performance of solar cells based on the Organic materials/ncTiO2 multilayer structure. That was investigated using X-ray diffraction, Atomic force microscopy (AFM), and Source-Measure Unit(SMU) under different ambient conditions. The device produced from batch A exhibit better performance compared to the device produced from batch B. The short circuit current, Jsc, increases from 0.03 mA/cm2 to 0.22 mA/cm2 , and the power conversion efficiency, η, from 0.01% to 0.09% in comparison between batches A and B solar cells. That is attributed to the grains of batch A nc-TiO2 having a size of 25 nm and a height of 100 nm, while particles of batch B nc-TiO2 film have a height of 40 nm and a size of 19 nm. These features cause to increase in the resistance and defects throughout the bulk region and interfaces of Batch B solar cells and impact the mechanism processes of charge generation of solar cells.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136204872","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 : 2023-10-01DOI: 10.15251/jor.2023.195.557
H. T. Ali, M. Akhtar, M. I. Arshad, N. Amin, A. U. Rehman, Z. Latif, M. A. Mehmood, M. A. Naveed
Zin substituted Mg-Mn-Bi nano ferrites, Mg0.5 𝑀𝑀𝑀𝑀0.5−x 𝑍𝑍𝑍𝑍x 𝐵𝐵𝑖𝑖0.05Fe1.95O4 (x= 0, 0.125, 0.25, 0.375, 0.5) were synthesized using the sol gel auto combustion method. Structural parameters were analyzed through x-ray diffraction. It was revealed that all the samples are single phase spinel structure with Fd-3m space group and crystallite size, lattice constant and x-ray densities were varying with Zn concentration. RAMAN analysis showed the cation vibration. The DC resistivity was enhanced of all the samples with increasing concentration of Zn. The substitution of Zn also responsible for the variation of magnetic parameters as observed with VSM. Due to these remarkable properties all the prepared samples may be utilized at high frequency in microwave devices.
{"title":"Tailoring of Structural, electrical, and dielectric properties of Mg-Mn-Bi nanoferrites with addition of Zn","authors":"H. T. Ali, M. Akhtar, M. I. Arshad, N. Amin, A. U. Rehman, Z. Latif, M. A. Mehmood, M. A. Naveed","doi":"10.15251/jor.2023.195.557","DOIUrl":"https://doi.org/10.15251/jor.2023.195.557","url":null,"abstract":"Zin substituted Mg-Mn-Bi nano ferrites, Mg0.5 𝑀𝑀𝑀𝑀0.5−x 𝑍𝑍𝑍𝑍x 𝐵𝐵𝑖𝑖0.05Fe1.95O4 (x= 0, 0.125, 0.25, 0.375, 0.5) were synthesized using the sol gel auto combustion method. Structural parameters were analyzed through x-ray diffraction. It was revealed that all the samples are single phase spinel structure with Fd-3m space group and crystallite size, lattice constant and x-ray densities were varying with Zn concentration. RAMAN analysis showed the cation vibration. The DC resistivity was enhanced of all the samples with increasing concentration of Zn. The substitution of Zn also responsible for the variation of magnetic parameters as observed with VSM. Due to these remarkable properties all the prepared samples may be utilized at high frequency in microwave devices.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135459637","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 : 2023-10-01DOI: 10.15251/jor.2023.195.567
E. M. Nasir, I. S. Naji, A. A. Ramadhan
By using vacuum evaporation, thin films of the (CdS)0.75-(PbS)0.25 alloy have been deposited to form a nanocrystalline composite. Investigations were made into the morphology, electrical, optical and I-V characteristics of (CdS)0.75-(PbS)0.25 films asdeposited and after annealing at various temperatures. According to AFM measurements, the values of grain sizes rise as annealing temperatures rise, showing that the films' crystallinity has been increased through heat treatment. In addition, heat treatment results in an increase in surface roughness values, suggesting rougher films that could be employed in more applications. The prepared films have direct energy band gaps, and these band gaps increase with the increase in the degrees of annealing temperature. Additionally, Urbach energy values decrease with an increase in annealing temperature degrees, indicating a reduction in the tail defects and an enhancement in crystal structure through annealing. The produced films' conductivity raise when temperature in the range (RT-473)K increased, demonstrating that they are semiconducting films. At comparatively lower temperature degrees, the conduction is caused by carriers that are stimulated into localized states at the band edges. At relatively higher temperatures, the conductivity appears to be substantially temperature-dependent. As a result, the conduction mechanism results from carriers being excited into extended states beyond mobility edges. The photovoltaic measurement (I–V) properties, open circuit voltage, short circuit current, efficiency and fill factor of (CdS)0.75-(PbS)0.25 heterostructure cells have been examined under 100mW/cm2 . Interestingly, rising annealing had enhanced photovoltaic cell performances; the solar cell had shown its highest efficiency (0.42%) at 573K. From XRD the structures are polycrystalline with cubic and hexagonal structures indicating that there’s a mix of phases of PbS and CdS, the grain size and intensity raise with annealing temperatures.
{"title":"Composite nanostructured growth of (CdS)0.75 (PbS)0.25/Si solar cell and its characterization","authors":"E. M. Nasir, I. S. Naji, A. A. Ramadhan","doi":"10.15251/jor.2023.195.567","DOIUrl":"https://doi.org/10.15251/jor.2023.195.567","url":null,"abstract":"By using vacuum evaporation, thin films of the (CdS)0.75-(PbS)0.25 alloy have been deposited to form a nanocrystalline composite. Investigations were made into the morphology, electrical, optical and I-V characteristics of (CdS)0.75-(PbS)0.25 films asdeposited and after annealing at various temperatures. According to AFM measurements, the values of grain sizes rise as annealing temperatures rise, showing that the films' crystallinity has been increased through heat treatment. In addition, heat treatment results in an increase in surface roughness values, suggesting rougher films that could be employed in more applications. The prepared films have direct energy band gaps, and these band gaps increase with the increase in the degrees of annealing temperature. Additionally, Urbach energy values decrease with an increase in annealing temperature degrees, indicating a reduction in the tail defects and an enhancement in crystal structure through annealing. The produced films' conductivity raise when temperature in the range (RT-473)K increased, demonstrating that they are semiconducting films. At comparatively lower temperature degrees, the conduction is caused by carriers that are stimulated into localized states at the band edges. At relatively higher temperatures, the conductivity appears to be substantially temperature-dependent. As a result, the conduction mechanism results from carriers being excited into extended states beyond mobility edges. The photovoltaic measurement (I–V) properties, open circuit voltage, short circuit current, efficiency and fill factor of (CdS)0.75-(PbS)0.25 heterostructure cells have been examined under 100mW/cm2 . Interestingly, rising annealing had enhanced photovoltaic cell performances; the solar cell had shown its highest efficiency (0.42%) at 573K. From XRD the structures are polycrystalline with cubic and hexagonal structures indicating that there’s a mix of phases of PbS and CdS, the grain size and intensity raise with annealing temperatures.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135459251","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 : 2023-10-01DOI: 10.15251/jor.2023.195.597
V. Thennarasu, A. Prabakaran
The use of non-renewable energy has brought to serious environmental problems for the planet. The amount of greenhouse gases rose immediately as the combustion of fossil fuels increased. As a result, sea levels are steadily rising and the Earth is becoming warmer. Research on renewable energy sources has been done extensively to provide a solution. However, in order to maximise energy utilisation, renewable energy needs an energy storage system, such as a super capacitor. For the development of sustainable supercapacitors for future energy systems, electrode material is a prospective target. The formation of desired electrode material is essential in order to fabricate supercapacitor with higher power density and longer life cycle than secondary batteries in electronic application. In this study, chitosan (CS) was isolated from crab shells, and graphene oxide (GO) was synthesized using a modified Hummers' process, followed by a chemical reduction approach. Based on the results, the synthesized GO exhibited higher capacitance as compared to GO that synthesized through single-step modified Hummers’ method. Continuous efforts have been exerted to further improve the electrochemical performance of GO/WO3 nanocomposite by incorporating an optimum content of WO3. In this manner, comprehensive investigations on different parameters, such as loadings of ammonium paratungstate (APT), hydrothermal temperature and reaction time were conducted in order to study the formation of GO/WO3 nanocomposite. WO3 and GO/WO3 nanocomposite were successfully synthesized through a simple hydrothermal method.
{"title":"Development of chitosan base graphene oxide/ WO3 hybrid composite for supercapacitor application","authors":"V. Thennarasu, A. Prabakaran","doi":"10.15251/jor.2023.195.597","DOIUrl":"https://doi.org/10.15251/jor.2023.195.597","url":null,"abstract":"The use of non-renewable energy has brought to serious environmental problems for the planet. The amount of greenhouse gases rose immediately as the combustion of fossil fuels increased. As a result, sea levels are steadily rising and the Earth is becoming warmer. Research on renewable energy sources has been done extensively to provide a solution. However, in order to maximise energy utilisation, renewable energy needs an energy storage system, such as a super capacitor. For the development of sustainable supercapacitors for future energy systems, electrode material is a prospective target. The formation of desired electrode material is essential in order to fabricate supercapacitor with higher power density and longer life cycle than secondary batteries in electronic application. In this study, chitosan (CS) was isolated from crab shells, and graphene oxide (GO) was synthesized using a modified Hummers' process, followed by a chemical reduction approach. Based on the results, the synthesized GO exhibited higher capacitance as compared to GO that synthesized through single-step modified Hummers’ method. Continuous efforts have been exerted to further improve the electrochemical performance of GO/WO3 nanocomposite by incorporating an optimum content of WO3. In this manner, comprehensive investigations on different parameters, such as loadings of ammonium paratungstate (APT), hydrothermal temperature and reaction time were conducted in order to study the formation of GO/WO3 nanocomposite. WO3 and GO/WO3 nanocomposite were successfully synthesized through a simple hydrothermal method.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136204870","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 : 2023-10-01DOI: 10.15251/jor.2023.195.547
A. Saleem, M. S. Shifa, S. A. Buzdar, H. M. N. ul H. K. Asghar, M. Mustaqeem, Z. A. Gilani, S. M. Ali, M. A. Shar, A K. Khan
Li-Co spinal ferrites were synthesized in pure and doped form by substituting/doping a post transition metal, bismuth in varying concentrations using micro-emulsion technique. Effect of bismuth substitution was studied by investigating the structural and magnetic properties in detail. X-ray diffractometer results confirmed the creation of single phase along with a slight occurrence of orthophase in prepared ferrites. Average crystallite size increased from 14 to 28 nm by increase in bismuth concentration. SEM micrographs were in complete agreement with XRD results showing spherical to cubic grains which was a confirmation of cubic spinal structure. Average estimated grain size of 52 nm showing agglomeration was also a good testimony of XRD results. VSM technique was employed to study magnetic properties of prepared samples within applied magnetic field strength of -10,000Oe to 10,000Oe. Ms and Hc values were observed to be decreasing with increasing bismuth content. Lower Ms and Hc values made our newly synthesized material fit for transformer cores and induction purposes.
{"title":"Structural and magnetic effect of bismuth substitution on Li-Co ferrite synthesized through microemulsion method","authors":"A. Saleem, M. S. Shifa, S. A. Buzdar, H. M. N. ul H. K. Asghar, M. Mustaqeem, Z. A. Gilani, S. M. Ali, M. A. Shar, A K. Khan","doi":"10.15251/jor.2023.195.547","DOIUrl":"https://doi.org/10.15251/jor.2023.195.547","url":null,"abstract":"Li-Co spinal ferrites were synthesized in pure and doped form by substituting/doping a post transition metal, bismuth in varying concentrations using micro-emulsion technique. Effect of bismuth substitution was studied by investigating the structural and magnetic properties in detail. X-ray diffractometer results confirmed the creation of single phase along with a slight occurrence of orthophase in prepared ferrites. Average crystallite size increased from 14 to 28 nm by increase in bismuth concentration. SEM micrographs were in complete agreement with XRD results showing spherical to cubic grains which was a confirmation of cubic spinal structure. Average estimated grain size of 52 nm showing agglomeration was also a good testimony of XRD results. VSM technique was employed to study magnetic properties of prepared samples within applied magnetic field strength of -10,000Oe to 10,000Oe. Ms and Hc values were observed to be decreasing with increasing bismuth content. Lower Ms and Hc values made our newly synthesized material fit for transformer cores and induction purposes.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135458775","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 : 2023-10-01DOI: 10.15251/jor.2023.195.579
Y. Soni, R. Agrawal, V. Yadav, P. Singh, S. Singh, U. Rani, A. S. Verma
Novel energy materials grab the attention of researchers because of the huge demand for green energy sources. We have attempted to investigate the physical properties of such material which will be suitable for photovoltaic applications. Double perovskites of A2BB’X6 framework have been conspicuous materials by the virtue of their magnificent electronic and optical properties. We have computed the physical properties of Cs2RbInI6 double perovskite compound using the first principles method along with density functional theory (DFT). Complete computational analysis has been done within wien2k simulation code which is based on full potential linearized augmented plane wave method.
{"title":"Electronic and optical properties of novel double perovskite compound Cs2RbInI6","authors":"Y. Soni, R. Agrawal, V. Yadav, P. Singh, S. Singh, U. Rani, A. S. Verma","doi":"10.15251/jor.2023.195.579","DOIUrl":"https://doi.org/10.15251/jor.2023.195.579","url":null,"abstract":"Novel energy materials grab the attention of researchers because of the huge demand for green energy sources. We have attempted to investigate the physical properties of such material which will be suitable for photovoltaic applications. Double perovskites of A2BB’X6 framework have been conspicuous materials by the virtue of their magnificent electronic and optical properties. We have computed the physical properties of Cs2RbInI6 double perovskite compound using the first principles method along with density functional theory (DFT). Complete computational analysis has been done within wien2k simulation code which is based on full potential linearized augmented plane wave method.","PeriodicalId":49156,"journal":{"name":"Journal of Ovonic Research","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136203841","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 : 2023-09-20DOI: 10.15251/jor.2023.195.535
S. Mahdid, D. Belfennache, D. Madi, M. Samah, R. Yekhlef, Y. Benkrima
A significant cost reduction in photovoltaic cells could be achieved if they could be made from thin polycrystalline silicon (poly-Si) films. Despite hydrogenation treatments of poly-Si films are necessary to obtain high energy conversion, the role of the n+ emitter on defects passivation via hydrogen diffusion in n+pp+ polysilicon solar cells is not yet understood thoroughly. In this connection, influence of hydrogenation temperature and doping level of the n+ emitter on open-circuit voltage (VOC) were analyzed. It was found that VOC greatly improved by a factor of 2.9 and reached up to 430 mV at a microwave plasma power and hydrogenation temperature of 650 W and 400°C, respectively for a duration of 60 min. Moreover, slow cooling is more advantageous for high VOC compared to the rapid cooling. However, etching of the emitter region was observed, and this degradation is similar for both cooling methods. Furthermore, annealing of the hydrogenated cells in inert gas for 30 min revealed a slight increase in VOC, which reached 40-80 mV, depending on the annealing temperature. These results were explained by hydrogen atoms diffusing into the bulk of the material from subsurface defects that are generated during plasma hydrogenation process. Also, our findings show clearly that VOC values are much higher for a less doped phosphorus emitter compared to that of heavily doped. The origin of these behaviors was clarified in detail.
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