Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"PbTe"”.
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Infrared photoconductive PbTe film processing and oxygen sensitization
… data autonomously. Lead chalcogenides such as PbTe are ideal photoconductive material candidates because (i) low-cost thermal deposition produces polycrystalline films that exhibit good mid-IR responsivity without being subject to lattice-matching constraints, and (ii) they do not require …
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Magnetic properties of Heisenberg antiferromagnetic EuTe/PbTe superlattices
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Lattice thermal conductivity of bulk and polycrystalline PbTe from computer simulations
… approach applied to porous, polycrystalline PbTe through a phase-field model informed by molecular dynamics simulations. The main hypothesis considered was that voids act as Zener pinning particles to stop grain growth and stabilise grain boundaries. We analyzed the stability of voids and …
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Localized defects in PbTe via a K.--APW energy band calculation.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1969. Ph.D.
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Temperature effects on the electronic properties of lead telluride (PbTe) and the influence of nano-size precipitates on the performance of thermoelectric materials. (SrTe precipitates in PbTe bulk material)
… were determined. The effect of interface between PbTe and SrTe on the charge carrier mobility was studied by finding out the relative alignment of energy bands at the semiconductor heterojunction. The crystal shape of the SrTe precipitates in the PbTe host matrix was evaluated from the interface …
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Ab initio study of electron transport in lead telluride
… figure of merit of lead telluride (PbTe) via nanostructures. Despite the experimental progress, current understanding of the electron transport in PbTe is based on either band structure simulated using first-principles in combination with constant relaxation time approximation or …
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Synthesis and characterization of metal chalcogenide nanostructured materials for thermoelectric applications
… is reported. The tellurides, specifically PbTe and Bi⊂2⊂Te⊂3⊂ (Bi⊂2⊂Te⊂3⊂–Sb⊂2⊂Te⊂3⊂ alloys) were selected as these are well established TE materials in bulk form. The approaches used for nanostructuring are (1) sol-gel assembly of discrete nanoparticles of PbTe, Bi⊂2⊂Te⊂3⊂, and …
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New Approaches To Chalcogenide Materials For Thermoelectrics: Lead Telluride-Based Nanostructures And Facile Synthesis Of Tetrahedrite And Doped Derivatives
… Target higher ZT by assembling lead telluride (PbTe) nanoparticles from a multi-gram synthesis utilizing ligand stripping techniques or deliberately including discrete lead sulfide (PbS) NCs. (2) Develop a rapid, convenient synthesis of tetrahedrite (Cu12Sb4S13).</p> <p>Approach (1): …
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The application of low dose SIMS to surface studies on compound semiconductors
… low coverage oxygen adsorption on MBE grown (111)PbTe and (100)GaAs surfaces. As a monitoring technique for surface preparation, SIMS shows the presence of oxygen on (100)GaAs at coverages below the detection limit of AES. The detection of both intact and fragmented sulphate radicals conclusively …
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Resonant-cavity-enhanced multispectral infrared photodetectors for monolithic integration on silicon
… field of IR radiation detection. Polycrystalline PbTe films have been identified as the IR absorbing layers due to their high photosensitivity and fabrication flexibility; on the device side, we have established a universal design theory for multispectral detection and demonstrated fully …
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DEVELOPMENT OF BISPECIFIC T CELL ENGAGERS TARGETING CARBONIC ANHYDRASE 9 FOR THE IMMUNE THERAPY OF CLEAR CELL RENAL CELL CARCINOMA
… the clinically relevant Persistent BTE (PBTE) format, advancing its design concept, and testing in vivo delivery through synthetic DNA (dBTEs). We show that, compared to a prototypical BTE, PBTE formatting weakens synapses by 3-fold through a novel application of avidity sensors, while …
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Correlation between structure, doping and performance of thermoelectric materials
… of zinc oxide (ZnO) and lead tellurium (PbTe). The main focus is on ZnO based materials and in improving their performance. The influences of micro- or nano-structures on thermal conductivity, as well as the correlation between the electrical property and synthesis conditions, have been …
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Solution Synthesized Nanostructured Thermoelectric Materials
… exists for solution synthesized nanostructured PbTe.
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The fabrication of TiO2 nanostructures on porous silicon for thermoelectric application
… leading TE materials are Bi2Te3-based alloys, PbTe, PbSe, SiGe, Mg2X (X = Si, Ge, Sn), skutterudite, and half-Heusler alloys. However, there are some problems arise since most of these rare earth alloy-based TE materials, such as Bi2Te3 and PbTe, suffer from thermal and chemical instabilities. …
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Embedded Multilayer Thin Film Stacks as Polarizing Beam Splitters and Wave Retarders Operating under Condition of Frustrated Total Internal Reflection
… employing 3, 7, 11, 15 and 19 layers of BaF2 and PbTe thin films embedded in a ZnS prism, operating at ë = 10.6 ìm, are presented. Embedded centro-symmetric multilayer stacks are also designed to function as complete-transmission quarter-wave or half-wave retardation (QWR or HWR) devices under …
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Experimental studies of the thermoelectric properties of microstructured and nanostructured lead salts
… less than the phonon mean free path. Samples of PbTe and PbSe were prepared by hot pressing nano-size and micro-sized particles and the thermal diffusivity, the Seebeck coefficient, and the electric conductivity of the samples were measured. The samples made from the nano-sized particles showed …
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Magnetooptische Untersuchungen an Halbleitersystemen mit reduzierter Dimensionalität
… in einer Probenserie von reinem PbSe zu reinem PbTe mit Hilfe von Magnetotransmissionsmessungen und kohärenten anti-Stokes Ramanstreuung bestimmt. Zur Untersuchung der Emission von PbSe Quantenpunkten sind diese in einen vertikalen Resonator eingebracht. Das von diesen nulldimensionalen Systemen …
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The Fabrication of Thermoelectric Materials Using Functionalised Silicon Nanoparticles
… of other thermoelectric materials such as Mg2Si, PbTe and Si-Ge alloy. To investigate the effects that the doping of ligands have on the thermoelectric properties of such materials, terthiophene functionalised SiNPs were synthesised and subsequently doped using varying levels of NOBF4. The …
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