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<meta name="description" content="Search results for: GaSb"> <meta name="keywords" content="GaSb"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler ml-auto" type="button" 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class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="GaSb"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 7</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: GaSb</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7</span> Effect of Precursor’s Grain Size on the Conversion of Microcrystalline Gallium Antimonide GaSb to Nanocrystalline Gallium Nitride GaN</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jerzy%20F.%20Janik">Jerzy F. Janik</a>, <a href="https://publications.waset.org/abstracts/search?q=Mariusz%20Drygas"> Mariusz Drygas</a>, <a href="https://publications.waset.org/abstracts/search?q=Miroslaw%20M.%20Bucko"> Miroslaw M. Bucko</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A simple precursor system has been recently developed in our laboratory for the conversion of affordable microcrystalline gallium antimonide GaSb to a range of nanocrystalline powders of gallium nitride GaN – a wide bandgap semiconductor indispensable in modern optoelectronics. The process relies on high temperature nitridation reactions of GaSb with ammonia. Topochemical relationships set up by the cubic lattice of GaSb result in some metastable cubic GaN formed in addition to the stable hexagonal GaN. A prior application of high energy ball milling to the initially microcrystalline GaSb precursor is shown to alter the nitridation output. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nanocrystalline" title="nanocrystalline">nanocrystalline</a>, <a href="https://publications.waset.org/abstracts/search?q=gallium%20nitride" title=" gallium nitride"> gallium nitride</a>, <a href="https://publications.waset.org/abstracts/search?q=GaN" title=" GaN"> GaN</a>, <a href="https://publications.waset.org/abstracts/search?q=gallium%20antimonide" title=" gallium antimonide"> gallium antimonide</a>, <a href="https://publications.waset.org/abstracts/search?q=GaSb" title=" GaSb"> GaSb</a>, <a href="https://publications.waset.org/abstracts/search?q=nitridation" title=" nitridation"> nitridation</a>, <a href="https://publications.waset.org/abstracts/search?q=ball%20milling" title=" ball milling"> ball milling</a> </p> <a href="https://publications.waset.org/abstracts/18150/effect-of-precursors-grain-size-on-the-conversion-of-microcrystalline-gallium-antimonide-gasb-to-nanocrystalline-gallium-nitride-gan" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/18150.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">400</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">6</span> Comparison of the Performance of GaInAsSb and GaSb Cells under Different Temperature Blackbody Radiations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Liangliang%20Tang">Liangliang Tang</a>, <a href="https://publications.waset.org/abstracts/search?q=Chang%20Xu"> Chang Xu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xingying%20Chen"> Xingying Chen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> GaInAsSb cells probably show better performance than GaSb cells in low-temperature thermophotovoltaic systems due to lower bandgap; however, few experiments proved this phenomenon so far. In this paper, numerical simulation is used to evaluate GaInAsSb and GaSb cells with similar structures under different radiation temperatures. We found that GaInAsSb cells with n-type emitters show slightly higher output power densities compared with that of GaSb cells with n-type emitters below 1,550 K-blackbody radiation, and the power density of the later cells will suppress the formers above this temperature point. During the temperature range of 1,000~2,000 K, the efficiencies of GaSb cells are about twice of GaInAsSb cells if perfect filters are used to prevent the emission of the non-absorbed long wavelength photons. Several parameters that affect the GaInAsSb cell were analyzed, such as doping profiles, thicknesses of GaInAsSb epitaxial layer and surface recombination velocity. The non-p junctions, i.e., n-type emitters are better for GaInAsSb cell fabrication, which is similar to that of GaSb cells. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thermophotovoltaic%20cell" title="thermophotovoltaic cell">thermophotovoltaic cell</a>, <a href="https://publications.waset.org/abstracts/search?q=GaSb" title=" GaSb"> GaSb</a>, <a href="https://publications.waset.org/abstracts/search?q=GaInAsSb" title=" GaInAsSb"> GaInAsSb</a>, <a href="https://publications.waset.org/abstracts/search?q=diffused%20emitters" title=" diffused emitters"> diffused emitters</a> </p> <a href="https://publications.waset.org/abstracts/50509/comparison-of-the-performance-of-gainassb-and-gasb-cells-under-different-temperature-blackbody-radiations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/50509.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">280</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5</span> Modeling and Simulation of InAs/GaAs and GaSb/GaAS Quantum Dot Solar Cells in SILVACO TCAD</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fethi%20Benyettou">Fethi Benyettou</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelkader%20Aissat"> Abdelkader Aissat</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20A.%20Benammar"> M. A. Benammar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this work, we use Silvaco TCAD software for modeling and simulations of standard GaAs solar cell, InAs/GaAs and GaSb/GaAs p-i-n quantum dot solar cell. When comparing 20-layer InAs/GaAs, GaSb/GaAs quantum dots solar cells with standard GaAs solar cell, the conversion efficiency in simulation results increased from 16.48 % to 22.6% and 16.48% to 22.42% respectively. Also, the absorption range edge of photons with low energies extended from 900 nm to 1200 nm. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=SILVACO%20TCAD" title="SILVACO TCAD">SILVACO TCAD</a>, <a href="https://publications.waset.org/abstracts/search?q=the%20quantum%20dot" title=" the quantum dot"> the quantum dot</a>, <a href="https://publications.waset.org/abstracts/search?q=simulation" title=" simulation"> simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=materials%20engineering" title=" materials engineering"> materials engineering</a> </p> <a href="https://publications.waset.org/abstracts/20994/modeling-and-simulation-of-inasgaas-and-gasbgaas-quantum-dot-solar-cells-in-silvaco-tcad" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20994.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">503</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">4</span> Thermal Conductivity and Optical Absorption of GaInAsSb/GaSb Laser Structure: Impact of Annealing Time</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Soufiene%20Ilahi">Soufiene Ilahi</a>, <a href="https://publications.waset.org/abstracts/search?q=Noureddine%20Yacoubi"> Noureddine Yacoubi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> GaInAsSb grown on GaSb substrate is an interesting material employed as an active layer in vertical-cavity surface-emitting lasers (VCSELs) operating in mid-infrared emission. This material presents some advantages like highs optical absorption coefficient and good thermal conductivity, which is very desirable for VCSEL application. In this paper, we have investigated the effects of thermal annealing on optical properties and thermal conductivity of GaInAsSb/GaSb. The studies are carried out by means of the photo thermal deflection spectroscopy technique (PDS). In fact, optical absorption spectrum and thermal conductivity have been determined by a comparison between the experimental and theoretical phases of the PDS signal. We have found that thermal conductivity increased significantly to 13 W/m.K for GaInAsSb annealed during 60 min. In addition, we have found that bandgap energy is blue-shifted around 30 meV. The amplitudes signal of PDS reveals multiple reflections as a function of annealing time, which reflect the high crystalline quality of the layer. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thermal%20conductivity" title="thermal conductivity">thermal conductivity</a>, <a href="https://publications.waset.org/abstracts/search?q=bandgap%20energy%20of%20GaInAsSb" title=" bandgap energy of GaInAsSb"> bandgap energy of GaInAsSb</a>, <a href="https://publications.waset.org/abstracts/search?q=GaInAsSb%20active%20layer" title=" GaInAsSb active layer"> GaInAsSb active layer</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20absorption" title=" optical absorption"> optical absorption</a> </p> <a href="https://publications.waset.org/abstracts/136451/thermal-conductivity-and-optical-absorption-of-gainassbgasb-laser-structure-impact-of-annealing-time" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/136451.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">151</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">3</span> InAs/GaSb Superlattice Photodiode Array ns-Response</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Utpal%20Das">Utpal Das</a>, <a href="https://publications.waset.org/abstracts/search?q=Sona%20Das"> Sona Das</a> </p> <p class="card-text"><strong>Abstract:</strong></p> InAs/GaSb type-II superlattice (T2SL) Mid-wave infrared (MWIR) focal plane arrays (FPAs) have recently seen rapid development. However, in small pixel size large format FPAs, the occurrence of high mesa sidewall surface leakage current is a major constraint necessitating proper surface passivation. A simple pixel isolation technique in InAs/GaSb T2SL detector arrays without the conventional mesa etching has been proposed to isolate the pixels by forming a more resistive higher band gap material from the SL, in the inter-pixel region. Here, a single step femtosecond (fs) laser anneal of the T2SL structure of the inter-pixel T2SL regions, have been used to increase the band gap between the pixels by QW-intermixing and hence increase isolation between the pixels. The p-i-n photodiode structure used here consists of a 506nm, (10 monolayer {ML}) InAs:Si (1x10¹⁸cm⁻³)/(10ML) GaSb SL as the bottom n-contact layer grown on an n-type GaSb substrate. The undoped absorber layer consists of 1.3µm, (10ML)InAs/(10ML)GaSb SL. The top p-contact layer is a 63nm, (10ML)InAs:Be(1x10¹⁸cm⁻³)/(10ML)GaSb T2SL. In order to improve the carrier transport, a 126nm of graded doped (10ML)InAs/(10ML)GaSb SL layer was added between the absorber and each contact layers. A 775nm 150fs-laser at a fluence of ~6mJ/cm² is used to expose the array where the pixel regions are masked by a Ti(200nm)-Au(300nm) cap. Here, in the inter-pixel regions, the p+ layer have been reactive ion etched (RIE) using CH₄+H₂ chemistry and removed before fs-laser exposure. The fs-laser anneal isolation improvement in 200-400μm pixels due to spatially selective quantum well intermixing for a blue shift of ~70meV in the inter-pixel regions is confirmed by FTIR measurements. Dark currents are measured between two adjacent pixels with the Ti(200nm)-Au(300nm) caps used as contacts. The T2SL quality in the active photodiode regions masked by the Ti-Au cap is hardly affected and retains the original quality of the detector. Although, fs-laser anneal of p+ only etched p-i-n T2SL diodes show a reduction in the reverse dark current, no significant improvement in the full RIE-etched mesa structures is noticeable. Hence for a 128x128 array fabrication of 8μm square pixels and 10µm pitch, SU8 polymer isolation after RIE pixel delineation has been used. X-n+ row contacts and Y-p+ column contacts have been used to measure the optical response of the individual pixels. The photo-response of these 8μm and other 200μm pixels under a 2ns optical pulse excitation from an Optical-Parametric-Oscillator (OPO), shows a peak responsivity of ~0.03A/W and 0.2mA/W, respectively, at λ~3.7μm. Temporal response of this detector array is seen to have a fast response ~10ns followed typical slow decay with ringing, attributed to impedance mismatch of the connecting co-axial cables. In conclusion, response times of a few ns have been measured in 8µm pixels of a 128x128 array. Although fs-laser anneal has been found to be useful in increasing the inter-pixel isolation in InAs/GaSb T2SL arrays by QW inter-mixing, it has not been found to be suitable for passivation of full RIE etched mesa structures with vertical walls on InAs/GaSb T2SL. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=band-gap%20blue-shift" title="band-gap blue-shift">band-gap blue-shift</a>, <a href="https://publications.waset.org/abstracts/search?q=fs-laser-anneal" title=" fs-laser-anneal"> fs-laser-anneal</a>, <a href="https://publications.waset.org/abstracts/search?q=InAs%2FGaSb%20T2SL" title=" InAs/GaSb T2SL"> InAs/GaSb T2SL</a>, <a href="https://publications.waset.org/abstracts/search?q=Inter-pixel%20isolation" title=" Inter-pixel isolation"> Inter-pixel isolation</a>, <a href="https://publications.waset.org/abstracts/search?q=ns-Response" title=" ns-Response"> ns-Response</a>, <a href="https://publications.waset.org/abstracts/search?q=photodiode%20array" title=" photodiode array"> photodiode array</a> </p> <a href="https://publications.waset.org/abstracts/99603/inasgasb-superlattice-photodiode-array-ns-response" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/99603.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">152</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2</span> Thermal Annealing Effects on Nonradiative Recombination Parameters of GaInAsSb/GaSb by Means of Photothermal Defection Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Souha%20Bouagila">Souha Bouagila</a>, <a href="https://publications.waset.org/abstracts/search?q=Soufiene%20Ilahi"> Soufiene Ilahi</a>, <a href="https://publications.waset.org/abstracts/search?q=Noureddine%20Yacoubi"> Noureddine Yacoubi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We have used Photothermal deflection spectroscopy PTD to investigate the impact of thermal annealing on electronics properties of GaInAsSb/GaSb.GaInAsSb used as an active layer for Vertical Cavity Surface Emitting laser (VCSEL). We have remarked that surface recombination velocity (SRV) from 7963 m / s (± 6.3%) to 1450 m / s (± 3.6) for as grown to sample annealed for 60 min. Accordingly, Force Microscopy images analyses agree well with the measure of surface recombination velocity. We have found that Root-Mean-Square Roughness (RMS) decreases as respect of annealing time. In addition, we have that the diffusion length and minority carrier mobility have been enhanced according to annealing time. However, due to annealing effects, the interface recombination velocity (IRV) is increased from 1196 m / s (± 5) to 6000 m/s (5%) for GaInAsSb in respect of annealed times. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nonradiative%20lifetime" title="nonradiative lifetime">nonradiative lifetime</a>, <a href="https://publications.waset.org/abstracts/search?q=mobility%20of%20minority%20carrier" title=" mobility of minority carrier"> mobility of minority carrier</a>, <a href="https://publications.waset.org/abstracts/search?q=diffusion%20length" title=" diffusion length"> diffusion length</a>, <a href="https://publications.waset.org/abstracts/search?q=Surface%20and%20interface%20recombination%20velocity" title=" Surface and interface recombination velocity"> Surface and interface recombination velocity</a> </p> <a href="https://publications.waset.org/abstracts/165142/thermal-annealing-effects-on-nonradiative-recombination-parameters-of-gainassbgasb-by-means-of-photothermal-defection-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/165142.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">74</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1</span> Thermal Annealing Effects on Minority Carrier Lifetime in GaInAsSb/GaSb by Means of Photothermal Defletion Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Souha%20Bouagila">Souha Bouagila</a>, <a href="https://publications.waset.org/abstracts/search?q=Soufiene%20Ilahi"> Soufiene Ilahi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Photothermal deflection technique PTD have been employed to study the impact of thermal annealing on minority carrier in GaInAsSb grown on GaSb substarte, which used as an active layer for Vertical Cavity Surface Emitting laser (VCSEL). Photothermal defelction technique is nondescructive and accurate technique for electronics parameters determination. The measure of non-radiative recombination, electronic diffusivity, surface and interface recombination are effectuated by fitting the theoretical PTD signal to the experimental ones. As a results, we have found that Non-radiative lifetime increases from 3.8 µs (± 3, 9 %) for not annealed GaInAsSb to the 7.1 µs (± 5, 7%). In fact, electronic diffusivity D increased from 60.1 (± 3.9 %) to 89.6 cm2 / s (± 2.7%) for the as grown to that annealed for 60 min respectively. We have remarked that surface recombination velocity (SRV) decreases from 7963 m / s (± 6.3%) to 1450 m / s (± 3.6). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nonradiative%20lifetime" title="nonradiative lifetime">nonradiative lifetime</a>, <a href="https://publications.waset.org/abstracts/search?q=mobility%20of%20minority%20carrier" title=" mobility of minority carrier"> mobility of minority carrier</a>, <a href="https://publications.waset.org/abstracts/search?q=diffusion%20length" title=" diffusion length"> diffusion length</a>, <a href="https://publications.waset.org/abstracts/search?q=Surface%20and%20interface%20recombination%20velocity.GaInAsSb%20active%20layer" title=" Surface and interface recombination velocity.GaInAsSb active layer"> Surface and interface recombination velocity.GaInAsSb active layer</a> </p> <a href="https://publications.waset.org/abstracts/169083/thermal-annealing-effects-on-minority-carrier-lifetime-in-gainassbgasb-by-means-of-photothermal-defletion-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/169083.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">69</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates its 16th foundational 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