Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997619
M. Ouadfel, A. Keffous, A. Cheriet, C. Yaddaden, N. Gabouze, Y. Belkacem, A. Khelloufi, H. Menari, M. Siad
This article deals with an early growth study of hydrogenated and non-hydrogenated amorphous silicon carbide thin films (a-SiC:H, a-SiC). Sample have been elaborated at room temperature by a new configuration (Up-down) sputtering d.c. magnetron technique, using a 6H-SiC polycrystalline target onto p-Si(100) and glass substrates. The infrared spectra reveal the existence of a band located at 740 cm-1, which corresponds to Si-C stretching mode of amorphous silicon carbide. The SIMS and AES profiles show a c-face for both a-SiC:H and a-SiC. Films elaborated with this configuration (Up-down) are stoichiometric, with a ratio 28Si/12C = 0.95, compared to the one elaborated with conventional configuration (Down-up), which is 1.75. The optical gap is 1.84 eV and 1.48 eV for a-SiC: H and a-SiC respectively. This behavior of optical gap may be related to the hydrogen concentration present in the films or other impurities inducing such a decrease in optical gap.
{"title":"SIMS and auger investigation of thin a-SiC and a-SiC:H films by Up-Down sputtering DC magnetron, impact on optical properties","authors":"M. Ouadfel, A. Keffous, A. Cheriet, C. Yaddaden, N. Gabouze, Y. Belkacem, A. Khelloufi, H. Menari, M. Siad","doi":"10.1109/NAWDMPV.2014.6997619","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997619","url":null,"abstract":"This article deals with an early growth study of hydrogenated and non-hydrogenated amorphous silicon carbide thin films (a-SiC:H, a-SiC). Sample have been elaborated at room temperature by a new configuration (Up-down) sputtering d.c. magnetron technique, using a 6H-SiC polycrystalline target onto p-Si(100) and glass substrates. The infrared spectra reveal the existence of a band located at 740 cm-1, which corresponds to Si-C stretching mode of amorphous silicon carbide. The SIMS and AES profiles show a c-face for both a-SiC:H and a-SiC. Films elaborated with this configuration (Up-down) are stoichiometric, with a ratio 28Si/12C = 0.95, compared to the one elaborated with conventional configuration (Down-up), which is 1.75. The optical gap is 1.84 eV and 1.48 eV for a-SiC: H and a-SiC respectively. This behavior of optical gap may be related to the hydrogen concentration present in the films or other impurities inducing such a decrease in optical gap.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127536100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997598
S. Hamouda, Salima Bouteraa, M. Sellami, N. Bettahar
Hydrotalcite (HT) or hydrotalcite-like compounds (HTlc) are layered double hydroxides belonging to the class of anionic clays. The structure of these compounds are very similar to that of brucite, Mg(OH)2, where some of Mg2+ represented as [M(II)] are isomorphously replaced by Al3+ represented as [M(III)] and the net positive charge is compensated by the inter-layered exchangeable anion (An-). LDH has been receiving increasing attention in recent years, owing to its potential technological applications such as catalysis, electrode, optical memory, separator, adsorbent, precursor for composite materials, and ion exchange. The general formula of these compounds can be represented as: [M(II)1-xM(III)x(OH)2]·Anx/n·mH2O with M(II) and M(III) as metal cations and An- as exchangeable anion. LDHs also possess relatively large surface areas and high anion-exchange capacities. Because of these properties, LDHs have been studied for removing toxic anionic species from aqueous systems. Thermal decomposition of these materials by calcination above 420°C results in the formation of high surface area basic mixed oxides which are reported to be potential candidates in catalyzing various reactions involved in the synthesis of a variety of fine chemicals. Indeed at this temperature, the as formed mixed oxides solid solution can regenerate upon rehydratation the HT structure with the suitable anions present in solution. Therefore, this so-called reconstruction process may be used to improve the sorption of anionic species. The LDH has been synthesized by the coprecipitation method at pH constant. The material has been obtained with [Mn/Al] molar ratio of 2.0. The product is characterized by X-ray diffraction (XRD), spectroscopy infra red (FTIR), and differential thermal analysis / thermo gravimetric analysis (DTA/TG). Dosages of polluted solutions have been realized by spectrometry UV visible.
{"title":"Preparation and intercalation reactions of nano-structural materials, Mn-Al LDH","authors":"S. Hamouda, Salima Bouteraa, M. Sellami, N. Bettahar","doi":"10.1109/NAWDMPV.2014.6997598","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997598","url":null,"abstract":"Hydrotalcite (HT) or hydrotalcite-like compounds (HTlc) are layered double hydroxides belonging to the class of anionic clays. The structure of these compounds are very similar to that of brucite, Mg(OH)2, where some of Mg2+ represented as [M(II)] are isomorphously replaced by Al3+ represented as [M(III)] and the net positive charge is compensated by the inter-layered exchangeable anion (An-). LDH has been receiving increasing attention in recent years, owing to its potential technological applications such as catalysis, electrode, optical memory, separator, adsorbent, precursor for composite materials, and ion exchange. The general formula of these compounds can be represented as: [M(II)1-xM(III)x(OH)2]·Anx/n·mH2O with M(II) and M(III) as metal cations and An- as exchangeable anion. LDHs also possess relatively large surface areas and high anion-exchange capacities. Because of these properties, LDHs have been studied for removing toxic anionic species from aqueous systems. Thermal decomposition of these materials by calcination above 420°C results in the formation of high surface area basic mixed oxides which are reported to be potential candidates in catalyzing various reactions involved in the synthesis of a variety of fine chemicals. Indeed at this temperature, the as formed mixed oxides solid solution can regenerate upon rehydratation the HT structure with the suitable anions present in solution. Therefore, this so-called reconstruction process may be used to improve the sorption of anionic species. The LDH has been synthesized by the coprecipitation method at pH constant. The material has been obtained with [Mn/Al] molar ratio of 2.0. The product is characterized by X-ray diffraction (XRD), spectroscopy infra red (FTIR), and differential thermal analysis / thermo gravimetric analysis (DTA/TG). Dosages of polluted solutions have been realized by spectrometry UV visible.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116468848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997613
Z. H. Belaid, A. Berrayah, F. Abdoune, L. Méchernène, L. Zair, Ulrich Maschke
Polymer Dispersed Liquid Crystals (PDLC) were elaborated by polymerization induced phase separation under ultraviolet (UV). A binary systems use in this study is composed of monomer of different molecular weights (TPGDA, PPGDA540 and PPGDA900), and 70 Wt.% of liquid crystal 5CB. The results showed a rapid decrease of the transmission of the LC droplet formation, followed by an enhancement of the transmission due to a thermal effect generated by exothermic curing, thermal diffusivity between components of the mixture monomers / LC, IR spectrum and high intensity of UV radiation emitted by LC3 lamp. PDLC films prepared exhibit different morphologies depending on the composition of the initial mixture, the UV dose, the molecular weight of the monomer and the nature of a LC. To quantify the effect of the molecular weight of the monomer on the kinetics of phase separation of the reactive mixtures, we realized a theoretical study that has given us a good accord with experiment.
{"title":"Effect of molecular weight of monomer on the processes of phase separation during the elaboration of composite materials type PDLC","authors":"Z. H. Belaid, A. Berrayah, F. Abdoune, L. Méchernène, L. Zair, Ulrich Maschke","doi":"10.1109/NAWDMPV.2014.6997613","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997613","url":null,"abstract":"Polymer Dispersed Liquid Crystals (PDLC) were elaborated by polymerization induced phase separation under ultraviolet (UV). A binary systems use in this study is composed of monomer of different molecular weights (TPGDA, PPGDA540 and PPGDA900), and 70 Wt.% of liquid crystal 5CB. The results showed a rapid decrease of the transmission of the LC droplet formation, followed by an enhancement of the transmission due to a thermal effect generated by exothermic curing, thermal diffusivity between components of the mixture monomers / LC, IR spectrum and high intensity of UV radiation emitted by LC3 lamp. PDLC films prepared exhibit different morphologies depending on the composition of the initial mixture, the UV dose, the molecular weight of the monomer and the nature of a LC. To quantify the effect of the molecular weight of the monomer on the kinetics of phase separation of the reactive mixtures, we realized a theoretical study that has given us a good accord with experiment.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132320287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997594
H. Mammar, A. Benmansour, M. Bouzaki
Nanostructuring is one of the most developed technologies that are able to improve considerably the photovoltaic conversion for low cost. This approach removes certain limitations of current technology; the photons that have low energy and do not participate in the photovoltaic conversion. Also, the photons that have a high energy that sell their excess energy in phonons' form. This work focuses on intermediate band solar cells introduced by material with a high-energy gap, an intermediate energy level, by quantum dots or quantum wells of some nanometers. This study attempts to show the great interest of this approach by calculating first, the efficiency limits of solar cell Shockley and interests in the intermediate-band photovoltaic solar cells approach by studying the parameters affecting their performances as well as the choice of materials and energy level of the nanostructure. All this, is achieved through the simulation software Matlab. The mathematical model developing stretches of photon emission by sun until the photovoltaic conversion in the semiconductor material.
{"title":"Improvement of the photovoltaic conversion efficiency using nanostructuring in intermediate-band photovoltaic solar cells","authors":"H. Mammar, A. Benmansour, M. Bouzaki","doi":"10.1109/NAWDMPV.2014.6997594","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997594","url":null,"abstract":"Nanostructuring is one of the most developed technologies that are able to improve considerably the photovoltaic conversion for low cost. This approach removes certain limitations of current technology; the photons that have low energy and do not participate in the photovoltaic conversion. Also, the photons that have a high energy that sell their excess energy in phonons' form. This work focuses on intermediate band solar cells introduced by material with a high-energy gap, an intermediate energy level, by quantum dots or quantum wells of some nanometers. This study attempts to show the great interest of this approach by calculating first, the efficiency limits of solar cell Shockley and interests in the intermediate-band photovoltaic solar cells approach by studying the parameters affecting their performances as well as the choice of materials and energy level of the nanostructure. All this, is achieved through the simulation software Matlab. The mathematical model developing stretches of photon emission by sun until the photovoltaic conversion in the semiconductor material.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133319128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The document provided a general understanding of solar energy and how solar technology can be applied in practice to supply the lighting needs of the premise. The site analysis Tlemcen, weather data, is the design of the predicted value of the PV system. We present the analysis using the software PVSYST to optimize the system design for the premise. Simulation and calculation was made by taking into account the inclination and direction of a photovoltaic generator consider. The proposed photovoltaic system is mainly composed of 3 unit inverter, 3 batteries and 66 photovoltaic modules with nominal power 9.9kWc.
{"title":"Study of a photovoltaic system connected to the network and simulated by the code PVSYST","authors":"Chadel Meriem, Benyoucef Boumdiene, Chadel Asma, Bouzaki Mustapha Mohamed, Soufi Aicha","doi":"10.1109/NAWDMPV.2014.6997605","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997605","url":null,"abstract":"The document provided a general understanding of solar energy and how solar technology can be applied in practice to supply the lighting needs of the premise. The site analysis Tlemcen, weather data, is the design of the predicted value of the PV system. We present the analysis using the software PVSYST to optimize the system design for the premise. Simulation and calculation was made by taking into account the inclination and direction of a photovoltaic generator consider. The proposed photovoltaic system is mainly composed of 3 unit inverter, 3 batteries and 66 photovoltaic modules with nominal power 9.9kWc.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127714564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997612
D. Mezdour, M. Tabellout, J. Bardeau, S. Sahli
The present work deals with the preparation of films from polymeric core-shell particles. Our approach is based on the chemical polymerization of a very thin layer of polyaniline (PANI) around particles of transparent polymers (polyamide and polystyrene). Films are then obtained by dissolving the two type synthesized core-shell powders in dichloromethane and m-Cresol respectively. Electrical properties were investigated using a dielectric relaxation spectrometer. Both composite films exhibited a percolative behaviour and a well established dc conductivity for high PANI concentration related to the conductive properties of the PANI spanning clusters. This property allows using such films in semi-conductive applications. For polyamide films, high dielectric constants were obtained at 5 wt. % of PANI allowing their use as high k-dielectrics compatibles with organic printed circuit boards.
{"title":"Dielectric and electrical properties of PANI composite films","authors":"D. Mezdour, M. Tabellout, J. Bardeau, S. Sahli","doi":"10.1109/NAWDMPV.2014.6997612","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997612","url":null,"abstract":"The present work deals with the preparation of films from polymeric core-shell particles. Our approach is based on the chemical polymerization of a very thin layer of polyaniline (PANI) around particles of transparent polymers (polyamide and polystyrene). Films are then obtained by dissolving the two type synthesized core-shell powders in dichloromethane and m-Cresol respectively. Electrical properties were investigated using a dielectric relaxation spectrometer. Both composite films exhibited a percolative behaviour and a well established dc conductivity for high PANI concentration related to the conductive properties of the PANI spanning clusters. This property allows using such films in semi-conductive applications. For polyamide films, high dielectric constants were obtained at 5 wt. % of PANI allowing their use as high k-dielectrics compatibles with organic printed circuit boards.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114810378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997596
A. Triki, M. Karray, C. Poilâne, P. Picart, M. Gargouri
Surface treatment of woven flax fibers was investigated as means of improving their adhesion in epoxy matrix. Flax fibers were treated in two ways : (i) with enzymatic treatments using pectinase enzymes and (ii) with pectinase enzymes/detergent, respectively. For this reason, dielectric measurements were performed in the frequency range from 10-1 Hz to 106 Hz and temperature interval from 40 °C to 200 °C. Studies of dielectric relaxations in these composites revealed the presence of three relaxation processes namely the orientation polarization imputed to the presence of polar water molecules in flax fibers, the relaxation process associated with conductivity occurring as a result of the carriers charges diffusion noted for high temperature above glass transition and low frequencies, and interfacial polarization effect or Maxwell-Wagner-Sillars (MWS) relaxation that is attributable to the accumulation of charges at the flax fibers/epoxy resin interfaces. Analysis of this latter using the Havriliak-Negami model revealed that the adhesion fibers/matrix was improved by the addition of the detergent treatment to the enzymatic one.
{"title":"Effect of ecological treatment on adhesion of woven flax fibers in epoxy matrix","authors":"A. Triki, M. Karray, C. Poilâne, P. Picart, M. Gargouri","doi":"10.1109/NAWDMPV.2014.6997596","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997596","url":null,"abstract":"Surface treatment of woven flax fibers was investigated as means of improving their adhesion in epoxy matrix. Flax fibers were treated in two ways : (i) with enzymatic treatments using pectinase enzymes and (ii) with pectinase enzymes/detergent, respectively. For this reason, dielectric measurements were performed in the frequency range from 10-1 Hz to 106 Hz and temperature interval from 40 °C to 200 °C. Studies of dielectric relaxations in these composites revealed the presence of three relaxation processes namely the orientation polarization imputed to the presence of polar water molecules in flax fibers, the relaxation process associated with conductivity occurring as a result of the carriers charges diffusion noted for high temperature above glass transition and low frequencies, and interfacial polarization effect or Maxwell-Wagner-Sillars (MWS) relaxation that is attributable to the accumulation of charges at the flax fibers/epoxy resin interfaces. Analysis of this latter using the Havriliak-Negami model revealed that the adhesion fibers/matrix was improved by the addition of the detergent treatment to the enzymatic one.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121362135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997604
M. Boumaour, A. Bahfir, S. Sali, S. Kermadi, L. Zougar, N. Ouarab
N+ transparent conductor oxides (TCO's) can be a valuable and low-cost alternative to conventional thermally diffused emitter of silicon based solar cells. With reduced resistivities by appropriate doping and considering lattice mismatch and energy band offsets at the interface with p-silicon substrate, predictive study by numerical simulation shows comparable performance between ZnS:Al and TiO2:Nb with conversion efficiencies >16%. Furthermore, a back surface field achieved by a thin Sb2Te3 can enhance the efficiency with values higher than 18.5%.
{"title":"Innovative emitter design for low-cost silicon based heterostructure solar cells","authors":"M. Boumaour, A. Bahfir, S. Sali, S. Kermadi, L. Zougar, N. Ouarab","doi":"10.1109/NAWDMPV.2014.6997604","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997604","url":null,"abstract":"N+ transparent conductor oxides (TCO's) can be a valuable and low-cost alternative to conventional thermally diffused emitter of silicon based solar cells. With reduced resistivities by appropriate doping and considering lattice mismatch and energy band offsets at the interface with p-silicon substrate, predictive study by numerical simulation shows comparable performance between ZnS:Al and TiO2:Nb with conversion efficiencies >16%. Furthermore, a back surface field achieved by a thin Sb2Te3 can enhance the efficiency with values higher than 18.5%.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116755832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997607
N. Benmoussa, A. Guen, B. Bouazza, R. Otmani
This paper is to study the phenomenon of electrostatic actuation of a silicon membrane for injecting a sufficient quantity of fluid and in particular medication with a micro pump. The latter becomes a void of first choice for the treatment of diseases such as diabetes that requires the use of a syringe for insulin injection. With the development of MEMS technology, the injection of insulin is transmitted through a micro pump located outside the human body and connected to a subcutaneous cannula to control the dosage depending on the need body. The idea is to take the patient's blood glucose and compared with a reference value. Based on the obtained difference, an electronic system calculates the volume of insulin and the number of units required to be injected to stabilize blood glucose levels. The micropump is constituted by a silicon membrane electrostatically actuated by a DC voltage V. This actuation causes deformation of the membrane leading to the opening of the first micro valve and the introduction of a unit volume in the chamber internal micro pump through the first pipe. The annulment of the voltage V leads to the return of the membrane at equilibrium. This causes the closure of the first valve and the opening of the second micro valve which will inject the fluid into the second pipe.
{"title":"Electrostatic actuation of a silicon membrane to control the injected fluid volume by a micro pump","authors":"N. Benmoussa, A. Guen, B. Bouazza, R. Otmani","doi":"10.1109/NAWDMPV.2014.6997607","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997607","url":null,"abstract":"This paper is to study the phenomenon of electrostatic actuation of a silicon membrane for injecting a sufficient quantity of fluid and in particular medication with a micro pump. The latter becomes a void of first choice for the treatment of diseases such as diabetes that requires the use of a syringe for insulin injection. With the development of MEMS technology, the injection of insulin is transmitted through a micro pump located outside the human body and connected to a subcutaneous cannula to control the dosage depending on the need body. The idea is to take the patient's blood glucose and compared with a reference value. Based on the obtained difference, an electronic system calculates the volume of insulin and the number of units required to be injected to stabilize blood glucose levels. The micropump is constituted by a silicon membrane electrostatically actuated by a DC voltage V. This actuation causes deformation of the membrane leading to the opening of the first micro valve and the introduction of a unit volume in the chamber internal micro pump through the first pipe. The annulment of the voltage V leads to the return of the membrane at equilibrium. This causes the closure of the first valve and the opening of the second micro valve which will inject the fluid into the second pipe.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132128356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/NAWDMPV.2014.6997602
F. Besahraoui, M. Bouslama, M. Ghafour, Z. Lounis, K. Hamaida
We have characterized with photoluminescence spectroscopy (PLS) the optoelectronic properties of self-assembled InAs quantum islands (QIs) grown on InP(001) substrate. InAs/InP(001) QIs are grown by Molecular Beam Epitaxy (MBE) method in optimized conditions of temperature and gas pressure. From Polarized Photoluminescence (PPL) measurements, we have deduced that InAs quantum islands have an isotropic quantum dots (QDs) shape. Through the excitation density PL measurements, we have checked the origin of the PL peaks. The observed PL peaks are related to a ground states of two families of InAs/InP(001) quantum dots. Through the study of the excitation density - PL spectra, we have evidenced the presence of a lateral coupling phenomenon between the two families of InAs/InP(001) quantum dots. In this case, the ground states are infected by this phenomenon which is considered, in this situation, a degradation source of the optoelectronic devices.
{"title":"Evidence of lateral coupling phenomenon in self-assembled InAs/InP(001) quantum dots characterized by photoluminescence spectroscopy (PLS)","authors":"F. Besahraoui, M. Bouslama, M. Ghafour, Z. Lounis, K. Hamaida","doi":"10.1109/NAWDMPV.2014.6997602","DOIUrl":"https://doi.org/10.1109/NAWDMPV.2014.6997602","url":null,"abstract":"We have characterized with photoluminescence spectroscopy (PLS) the optoelectronic properties of self-assembled InAs quantum islands (QIs) grown on InP(001) substrate. InAs/InP(001) QIs are grown by Molecular Beam Epitaxy (MBE) method in optimized conditions of temperature and gas pressure. From Polarized Photoluminescence (PPL) measurements, we have deduced that InAs quantum islands have an isotropic quantum dots (QDs) shape. Through the excitation density PL measurements, we have checked the origin of the PL peaks. The observed PL peaks are related to a ground states of two families of InAs/InP(001) quantum dots. Through the study of the excitation density - PL spectra, we have evidenced the presence of a lateral coupling phenomenon between the two families of InAs/InP(001) quantum dots. In this case, the ground states are infected by this phenomenon which is considered, in this situation, a degradation source of the optoelectronic devices.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133408956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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