Pub Date : 2023-02-23DOI: 10.15251/cl.2023.202.165
N. Messei, M. Aida, A. Attaf, N. Hamani, S. Laznek
To enhance the efficiency of kesterite Cu2ZnSnS4 solar cell, different gradient strategies are investigated. Absorber layer gradient is obtained by partial substitution of sulfur with selenium or tin with germanium. The PV Parameters are calculated using the SCAPS1D program. The effect of the front, back, and double gradient on the cell parameters was investigated. We proposed also the fully graded gap absorber layer profile. The opencircuit voltage has increased to 1.040V, the fill factor has increased to 71.69%, and the efficiency has exceeded 22.95%. In contrast to other types of gradients, the short-circuit current density remains high (Jsc= 39.7mA / cm2 ).
{"title":"Numerical simulation of the effect of gradual substitution of sulfur with selenium or tin with germanium in Cu2ZnSnS4 absorber layer on kesterite solar cell efficiency","authors":"N. Messei, M. Aida, A. Attaf, N. Hamani, S. Laznek","doi":"10.15251/cl.2023.202.165","DOIUrl":"https://doi.org/10.15251/cl.2023.202.165","url":null,"abstract":"To enhance the efficiency of kesterite Cu2ZnSnS4 solar cell, different gradient strategies are investigated. Absorber layer gradient is obtained by partial substitution of sulfur with selenium or tin with germanium. The PV Parameters are calculated using the SCAPS1D program. The effect of the front, back, and double gradient on the cell parameters was investigated. We proposed also the fully graded gap absorber layer profile. The opencircuit voltage has increased to 1.040V, the fill factor has increased to 71.69%, and the efficiency has exceeded 22.95%. In contrast to other types of gradients, the short-circuit current density remains high (Jsc= 39.7mA / cm2 ).","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44735710","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}
K. A. Mohammed, A. Ajam, A. Kareem, K. H. Salem, M. A. Alkhafaji, R. Zabibah
In current work, Nanoparticles of cadmium zinc sulfide (CdZnS) and copper zinc sulfide (Cu:CdZnS) were synthesized through a capping-agent-free chemical co-precipitation method. This article focuses on the optical characteristics, elemental analysis, and surface morphology of CdZnS and Cu:CdZnS. this properties of prepared materials were investigated using a variety of techniques, including X-ray diffraction (XRD), scanning electron microscopy, energy dispersive X-ray, and ultraviolet–visible absorption. The results show both pure and doped CdZnS have cubic structure. The energy gap of CdZnS was equal to 3.14 eV and 3.4 eV for Cu doped CdZnS. According to the results the prepared nanoparticles are suitable for photdegradation applications.
{"title":"Doping effect on properties of CdZnS nanoparticles","authors":"K. A. Mohammed, A. Ajam, A. Kareem, K. H. Salem, M. A. Alkhafaji, R. Zabibah","doi":"10.15251/cl.2023.201.11","DOIUrl":"https://doi.org/10.15251/cl.2023.201.11","url":null,"abstract":"In current work, Nanoparticles of cadmium zinc sulfide (CdZnS) and copper zinc sulfide (Cu:CdZnS) were synthesized through a capping-agent-free chemical co-precipitation method. This article focuses on the optical characteristics, elemental analysis, and surface morphology of CdZnS and Cu:CdZnS. this properties of prepared materials were investigated using a variety of techniques, including X-ray diffraction (XRD), scanning electron microscopy, energy dispersive X-ray, and ultraviolet–visible absorption. The results show both pure and doped CdZnS have cubic structure. The energy gap of CdZnS was equal to 3.14 eV and 3.4 eV for Cu doped CdZnS. According to the results the prepared nanoparticles are suitable for photdegradation applications.","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42426412","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}
A thin film of iron disulfide (FeS2) and Mn-doped was prepared using the chemical spray pyrolysis (CSP) method at a constant temperature of the glass substrate at around 400 °C. According to XRD examination, films were structurally cubic oriented with a predominant planar orientation (201). The doping of Mn ions in the FeS2 host matrix was confirmed by a minor shift of the diffraction peak towards the lower 2θ values. The surface of the produced film for pyrite was homogeneous, according to the AFM investigations. According to the XRD data, the predicted grain size altered as the consistent manganese increased. When compared to undoped FeS2 thin films, the Mn2+- doped FeS2 thin films' desired bandgap energy showed a red shift.
{"title":"Synthesis and characterization of manganese-doped FeS2 thin films via chemical spray pyrolysis","authors":"R. Ali, H. S. Rasheed, N. Habubi, S. Chiad","doi":"10.15251/cl.2023.201.63","DOIUrl":"https://doi.org/10.15251/cl.2023.201.63","url":null,"abstract":"A thin film of iron disulfide (FeS2) and Mn-doped was prepared using the chemical spray pyrolysis (CSP) method at a constant temperature of the glass substrate at around 400 °C. According to XRD examination, films were structurally cubic oriented with a predominant planar orientation (201). The doping of Mn ions in the FeS2 host matrix was confirmed by a minor shift of the diffraction peak towards the lower 2θ values. The surface of the produced film for pyrite was homogeneous, according to the AFM investigations. According to the XRD data, the predicted grain size altered as the consistent manganese increased. When compared to undoped FeS2 thin films, the Mn2+- doped FeS2 thin films' desired bandgap energy showed a red shift.","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48730290","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}
M. Alqahtani, F. Alqahtani, A. Almarhaby, K. I. Hussain, Y. Khalid, H. Almohiy, I. Yaha, E. Yousef
Because of the increased use of ionizing radiation, radiation management and security procedures are now regarded a standard part of many therapeutic and specialist fields. The focus of this work is on the radiation security features of Novel Oxide Glass (PZBKTANEr). The unique glass assembly is 40P2O5-30ZnO- 20BaF2-3.8K2TeO3- 1.2Al2O3-5Nb2O5-3Er2O3 in mol percent (test code PZBKTANEr). For the suggested oxide glass, several radiation shielding characteristics have been investigated for a specific energy range of ionizing radiation. The linear and mass attenuation coefficients, mean free path, half-value layer, total nuclear and electronic cross-sections, and fast neutron expulsion cross-section are among the radiation shielding properties. Furthermore, the unique fabricated glass (PZBKTANEr) was compared to commonly used radiation protection compositions, such as RS-253 G18, RS-360, RS-520, Chromite, Ferrite, Magnetite, and Barite glass, as well as RS-253 G18, RS-360, RS-520, Chromite, Ferrite, Magnetite, and Barite glass. Also, we studied the structure of fabrication by using Raman spectra. The findings suggest that the new oxide glass might be used in a broad variety of ionizing radiation applications for protection in both therapeutic and industrial applications.
{"title":"Structural and performance radiation protection the phosphate glasses contain: Te, K, Al, Nb-doped with rare earth","authors":"M. Alqahtani, F. Alqahtani, A. Almarhaby, K. I. Hussain, Y. Khalid, H. Almohiy, I. Yaha, E. Yousef","doi":"10.15251/cl.2023.201.43","DOIUrl":"https://doi.org/10.15251/cl.2023.201.43","url":null,"abstract":"Because of the increased use of ionizing radiation, radiation management and security procedures are now regarded a standard part of many therapeutic and specialist fields. The focus of this work is on the radiation security features of Novel Oxide Glass (PZBKTANEr). The unique glass assembly is 40P2O5-30ZnO- 20BaF2-3.8K2TeO3- 1.2Al2O3-5Nb2O5-3Er2O3 in mol percent (test code PZBKTANEr). For the suggested oxide glass, several radiation shielding characteristics have been investigated for a specific energy range of ionizing radiation. The linear and mass attenuation coefficients, mean free path, half-value layer, total nuclear and electronic cross-sections, and fast neutron expulsion cross-section are among the radiation shielding properties. Furthermore, the unique fabricated glass (PZBKTANEr) was compared to commonly used radiation protection compositions, such as RS-253 G18, RS-360, RS-520, Chromite, Ferrite, Magnetite, and Barite glass, as well as RS-253 G18, RS-360, RS-520, Chromite, Ferrite, Magnetite, and Barite glass. Also, we studied the structure of fabrication by using Raman spectra. The findings suggest that the new oxide glass might be used in a broad variety of ionizing radiation applications for protection in both therapeutic and industrial applications.","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44866287","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/cl.2023.205.377
A. Gahtar, C. Zaouche, A. Ammari, L. Dahbi
In this work, the bimetallic (Ni,Co) sulfide film of 852.213 nm thickness was successfully deposited using the spray pyrolysis technique at 300 °C. The compound was prepared with a mixture of nickel acetate (C4H6O4Ni. 4H2O), cobalt chloride (CoCl2. 6H2O), and thiourea (CS(NH2)2) as precursors for Ni, Co, and S, respectively. The temperature and sedimentation time were 300 °C and 10 min, respectively; the film was then, characterized without any thermal post-treatment. The structural, morphological, optical and electrical analysis were carried out to investigate the different properties of the material. The X-ray diffraction analysis confirmed the presence of NiCo2S4 according to the JCPDS Card # 98- 004-0019, with an average crystallite size of 34.45 nm. The optical analysis revealed the metallic behavior of the film with an average transmittance of 3.41% in the visible region and a direct optical band gap of 2.15 eV, as well as a high absorption coefficient of α ≈ 104 - 105 cm-1 ). The elementary composition analysis (EDS) confirmed the presence of Ni, Co and S elements in the film. Morphological analysis revealed a homogeneous, compact, crack-free appearance and a granular surface in all studied areas. On the other hand, the film shows a high electrical conductivity of about 1.42×105 S/cm at room temperature. The obtained results show that the bimetallic (Ni, Co) sulfide prepared in this study exhibits a good crystallinity, dense morphology, good stoichiometric ratio and high conductivity. Therefore, it is a potential candidate for application in supercapacitors as electrode material.
{"title":"Growth and characterization of bimetallic (Ni,Co) sulfide thin films deposited by spray pyrolysis","authors":"A. Gahtar, C. Zaouche, A. Ammari, L. Dahbi","doi":"10.15251/cl.2023.205.377","DOIUrl":"https://doi.org/10.15251/cl.2023.205.377","url":null,"abstract":"In this work, the bimetallic (Ni,Co) sulfide film of 852.213 nm thickness was successfully deposited using the spray pyrolysis technique at 300 °C. The compound was prepared with a mixture of nickel acetate (C4H6O4Ni. 4H2O), cobalt chloride (CoCl2. 6H2O), and thiourea (CS(NH2)2) as precursors for Ni, Co, and S, respectively. The temperature and sedimentation time were 300 °C and 10 min, respectively; the film was then, characterized without any thermal post-treatment. The structural, morphological, optical and electrical analysis were carried out to investigate the different properties of the material. The X-ray diffraction analysis confirmed the presence of NiCo2S4 according to the JCPDS Card # 98- 004-0019, with an average crystallite size of 34.45 nm. The optical analysis revealed the metallic behavior of the film with an average transmittance of 3.41% in the visible region and a direct optical band gap of 2.15 eV, as well as a high absorption coefficient of α ≈ 104 - 105 cm-1 ). The elementary composition analysis (EDS) confirmed the presence of Ni, Co and S elements in the film. Morphological analysis revealed a homogeneous, compact, crack-free appearance and a granular surface in all studied areas. On the other hand, the film shows a high electrical conductivity of about 1.42×105 S/cm at room temperature. The obtained results show that the bimetallic (Ni, Co) sulfide prepared in this study exhibits a good crystallinity, dense morphology, good stoichiometric ratio and high conductivity. Therefore, it is a potential candidate for application in supercapacitors as electrode material.","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","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":"67025004","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}
In the present investigation ZnO thin films have been prepared by sol-gel spin coating technique with different pH values. The effect of pH values of precursor solution on the crystal structural, morphological and humidity sensing properties of ZnO nanostructures have been investigated using different characterization technique. The crystal structure and phase analysis has been examined by powder X-ray diffraction (PXRD) technique. The PXRD pattern clearly revealed the ZnO thin films have hexagonal wurtzite crystal structure. The average crystallite size of ZnO thin films have been calculated using Scherer formula and found to be ~24 nm to ~30 nm. The microstrain (ɛa) and (ɛc) of ZnO thin films for different pH values 8 and 11, have been calculated and found to be 7.59, 0.1017; 7.57, 0.1094 respectively. The scanning electron microscopy (SEM) image depicts the formation of spherical nanostructurewith diameter range 80 to 95 nm distributed throughout the surface. The atomic force microscopy (AFM) image also shows the spherical nanostructureconsistently distributed throughout the surface with diameter range 75 to 80 nm.It was also found that increasing the pH values from 8 to 11 modified the grains and grains boundary. The humidity sensing properties of ZnO thin films prepared from pH values of 8 to 11 and found to be lower hysteresis loss, less aging effect and good sensitivity in the range of 8.37 MΩ/%RH to 12.25 MΩ/%RH respectively
{"title":"Effect of pH values on the structural, morphological and sensing properties of ZnO nanostructure","authors":"A. Zaidi, K. TiwariA., R. R. Awasthi, K. Dubey","doi":"10.15251/cl.2023.201.33","DOIUrl":"https://doi.org/10.15251/cl.2023.201.33","url":null,"abstract":"In the present investigation ZnO thin films have been prepared by sol-gel spin coating technique with different pH values. The effect of pH values of precursor solution on the crystal structural, morphological and humidity sensing properties of ZnO nanostructures have been investigated using different characterization technique. The crystal structure and phase analysis has been examined by powder X-ray diffraction (PXRD) technique. The PXRD pattern clearly revealed the ZnO thin films have hexagonal wurtzite crystal structure. The average crystallite size of ZnO thin films have been calculated using Scherer formula and found to be ~24 nm to ~30 nm. The microstrain (ɛa) and (ɛc) of ZnO thin films for different pH values 8 and 11, have been calculated and found to be 7.59, 0.1017; 7.57, 0.1094 respectively. The scanning electron microscopy (SEM) image depicts the formation of spherical nanostructurewith diameter range 80 to 95 nm distributed throughout the surface. The atomic force microscopy (AFM) image also shows the spherical nanostructureconsistently distributed throughout the surface with diameter range 75 to 80 nm.It was also found that increasing the pH values from 8 to 11 modified the grains and grains boundary. The humidity sensing properties of ZnO thin films prepared from pH values of 8 to 11 and found to be lower hysteresis loss, less aging effect and good sensitivity in the range of 8.37 MΩ/%RH to 12.25 MΩ/%RH respectively","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46641756","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/cl.2023.205.343
N. Urusova, A. I. Merentsov, E. Stepanov, O. Reznitskikh
CoxTiS2 (x = 0.20, 0.30, 0.50, 0.75) compounds have a layered crystal structure with Ti atoms surrounded by the S octahedrons in the S-Ti-S layers and Co ions which could be surrounded both by the S octahedrons and tetrahedrons. The features of the crystal structure and magnetic properties of the polycrystalline CoxTiS2 samples were studied as a function of the cobalt concentration using X-ray diffraction and magnetization measurements. The disordered state of the Co atoms (x < 0.20) changes to the ordered one (x ≥ 0.20). The magnetic ordering arises at x = 0.20 with mostly antiferromagnetic interaction. For compound with x = 0.30 and 0.50 there is a weak ferromagnetic ordering. The ferromagnetic ordering is observed in Co0.75TiS2 below Tc = 375 K.
{"title":"Features of structural ordering and magnetic properties of the cobalt intercalates of titanium dichalcogenides","authors":"N. Urusova, A. I. Merentsov, E. Stepanov, O. Reznitskikh","doi":"10.15251/cl.2023.205.343","DOIUrl":"https://doi.org/10.15251/cl.2023.205.343","url":null,"abstract":"CoxTiS2 (x = 0.20, 0.30, 0.50, 0.75) compounds have a layered crystal structure with Ti atoms surrounded by the S octahedrons in the S-Ti-S layers and Co ions which could be surrounded both by the S octahedrons and tetrahedrons. The features of the crystal structure and magnetic properties of the polycrystalline CoxTiS2 samples were studied as a function of the cobalt concentration using X-ray diffraction and magnetization measurements. The disordered state of the Co atoms (x < 0.20) changes to the ordered one (x ≥ 0.20). The magnetic ordering arises at x = 0.20 with mostly antiferromagnetic interaction. For compound with x = 0.30 and 0.50 there is a weak ferromagnetic ordering. The ferromagnetic ordering is observed in Co0.75TiS2 below Tc = 375 K.","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","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":"67024809","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/cl.2023.207.515
D. Said, N. M. Samsudin, M. Naaim, M. I. Sayyed, M. Zaid, M. Azlan, S. M. Iskandar, N. N. Yusof, E. S. Sazali, R. Hisam
(80-x)B2O3-xTeO2-10Li2O-Al2O3 (x=10-60 mol%) mixed glass former (MGF) glasses were prepared by using melt-quenching method to investigate the effect of mixed glass former between B2O3 and TeO2 on the optical properties and to evaluate the radiation shielding ability of the glass. Extremes observed at x=40 mol% for all optical properties’ parameters were suggested due to large number of non-bridging oxygen. The radiation shielding properties of the glass samples were determined for 0.284 MeV–1.333 MeV energy range by using Phy-X/PSD software. The studied radiation parameters have shown enhancement due to high density and high atomic number, Z of Te over B
{"title":"Impact of TeO2-B2O3 manipulation on optical and radiation shielding properties of mixed glass former borotellurite glass","authors":"D. Said, N. M. Samsudin, M. Naaim, M. I. Sayyed, M. Zaid, M. Azlan, S. M. Iskandar, N. N. Yusof, E. S. Sazali, R. Hisam","doi":"10.15251/cl.2023.207.515","DOIUrl":"https://doi.org/10.15251/cl.2023.207.515","url":null,"abstract":"(80-x)B2O3-xTeO2-10Li2O-Al2O3 (x=10-60 mol%) mixed glass former (MGF) glasses were prepared by using melt-quenching method to investigate the effect of mixed glass former between B2O3 and TeO2 on the optical properties and to evaluate the radiation shielding ability of the glass. Extremes observed at x=40 mol% for all optical properties’ parameters were suggested due to large number of non-bridging oxygen. The radiation shielding properties of the glass samples were determined for 0.284 MeV–1.333 MeV energy range by using Phy-X/PSD software. The studied radiation parameters have shown enhancement due to high density and high atomic number, Z of Te over B","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","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":"67024622","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/cl.2023.205.353
P. Yadav, C. Tyagi, A. Devi, N. Gahlot
The present work reports the influence of selenium replacement by bismuth on the nonlinear optical parameters of ternary Se85-xTe15Bix (x=0, 1, 2, 3, 4, 5 atomic %) chalcogenide thin films. Calculation of nonlinear refractive index (n2), two-photon absorption coefficient (β2) and third-order susceptibility (χ (3)) by well known Z-scan technique with femtosecond laser pulses were done. The Z-scan spectra for Se85-xTe15Bix upto Bi= 4 atomic % results in self- focusing behavior of n2 is positive while for Bi=5 atomic % n2 is negative. The behavior of n2 by using different physical parameters are exlpained. The comparison of experimental and theoretical values of n2 with pure silica are also studied. The presence of the valley at focus in open aperture Z-scan graph demonstrates strong reverse saturable absorption. The figure of merit (FOM) for the SeTe-Bi chalcogenide thin films is found to be less than 1 and are beneficial for all-optical switch devices.
{"title":"Study of femtosecond nonlinear optical coefficients for Bi doped Se85-xTe15Bix chalcogenide thin films","authors":"P. Yadav, C. Tyagi, A. Devi, N. Gahlot","doi":"10.15251/cl.2023.205.353","DOIUrl":"https://doi.org/10.15251/cl.2023.205.353","url":null,"abstract":"The present work reports the influence of selenium replacement by bismuth on the nonlinear optical parameters of ternary Se85-xTe15Bix (x=0, 1, 2, 3, 4, 5 atomic %) chalcogenide thin films. Calculation of nonlinear refractive index (n2), two-photon absorption coefficient (β2) and third-order susceptibility (χ (3)) by well known Z-scan technique with femtosecond laser pulses were done. The Z-scan spectra for Se85-xTe15Bix upto Bi= 4 atomic % results in self- focusing behavior of n2 is positive while for Bi=5 atomic % n2 is negative. The behavior of n2 by using different physical parameters are exlpained. The comparison of experimental and theoretical values of n2 with pure silica are also studied. The presence of the valley at focus in open aperture Z-scan graph demonstrates strong reverse saturable absorption. The figure of merit (FOM) for the SeTe-Bi chalcogenide thin films is found to be less than 1 and are beneficial for all-optical switch devices.","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","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":"67024873","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}
We have prepared a group of GexAs10Se90-x glass(x=5, 10, 15, 20, 25, 30, and 35 at. %) and investigated their structure and physical properties. It was found that, the minimum refractive index and maximum optical bandgap occur in Ge25As10Se65 glass that is chemically stoichiometric. Analysis of Raman spectra of the glasses indicated that the number of the Ge-Ge, As-As, and Se-Se homopolar bonds is closely related to the bandgap, because the band-tails formed by homopolar bonds could reduce the optical bandgap. The transition behavior of the structural units and physical properties of the glasses occurs at the glass with the chemically stoichiometric composition, and thus the chemical composition dominates physical properties of GexAs10Se90-x chalcogenide glasses
{"title":"The effect of the structure on the physical properties in GexAs10Se90-x glasses","authors":"S. W. Xu, T. Liang, X. Y. Zhu","doi":"10.15251/cl.2023.201.55","DOIUrl":"https://doi.org/10.15251/cl.2023.201.55","url":null,"abstract":"We have prepared a group of GexAs10Se90-x glass(x=5, 10, 15, 20, 25, 30, and 35 at. %) and investigated their structure and physical properties. It was found that, the minimum refractive index and maximum optical bandgap occur in Ge25As10Se65 glass that is chemically stoichiometric. Analysis of Raman spectra of the glasses indicated that the number of the Ge-Ge, As-As, and Se-Se homopolar bonds is closely related to the bandgap, because the band-tails formed by homopolar bonds could reduce the optical bandgap. The transition behavior of the structural units and physical properties of the glasses occurs at the glass with the chemically stoichiometric composition, and thus the chemical composition dominates physical properties of GexAs10Se90-x chalcogenide glasses","PeriodicalId":9710,"journal":{"name":"Chalcogenide Letters","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49588853","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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