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 20 for “"Cadmium telluride (CdTe)"”.
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DFT calculations for cadmium telluride (CdTe)
Cadmium Telluride (CdTe) thin film photovoltaics (PV) has demonstrated low Levelized Cost of Energy (LCOE). CdTe technology also counted for half the thin film market in 2013 [3]. CdTe PV has the smallest carbon footprint a nd the energy payback time (less than one year) is the shortest of any …
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Solution-processed doping in CdTe thin film solar cells
Cadmium Telluride (CdTe) is one of the leading photovoltaic (PV) technologies in the world with a world record ~ 22.1%. With a bandgap of 1.45eV and a high absorption coefficient, the theoretical power conversion efficiency limit of 32% is limited by recombination and high resistivities in CdTe …
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Measurement and Modeling of Blocking Contacts for Cadmium Telluride Gamma Ray Detectors
… with high density and atomic number, such as Cadmium Telluride (CdTe), offer a small device footprint, but their performance is limited by noise at room temperature; however, improved device design can decrease detector noise by reducing leakage current. This thesis characterizes and models …
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Characterization of tellurium back contact layer for CdTe thin film devices
Cadmium Telluride (CdTe) thin film photovoltaic technology has shown favorable progress due to inexpensive and efficient processing techniques. However, efficiencies have yet to reach the overall projected CdTe device efficiency, with the back contact being a main source of CdTe performance …
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Evaluation of room-temperature semiconductor detectors for ultrahigh resolution pet imaging
… presented. The approach is based on the use of a CdTe semiconductor detector. The detector is a 2mm thick cadmium telluride (CdTe) detector with a pixel pitch of 350μm x 350μm; it is bump bonded to an energy-resolved photo-counting (ERPC) readout applied-specific integrated circuit (ASIC). It can …
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Novel infrared spectroscopic techniques for the study of adsorbed proteins on photoactive thin films
… confining layers and photoactive nanocrystal cadmium telluride (CdTe) thin films, a system capable of in situ study of adsorbed protein films on photoactive layers was created. Due to the oxygen intolerance of the enzyme of interest for this work (a [FeFe]-hydrogenase from Clostridium …
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Research and development of CdS/CdTe solar cells incorporating ZnTe layers.
… from periodic table. The semiconductors are cadmium sulfide (CdS), cadmium telluride (CdTe) and zinc telluride (ZnTe).All of these layers were obtained by growing them using electrodeposition in aqueous solutions. In this project, electrodeposition using 2-electrode system was employed to …
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Hard X-ray diagnostics of particle acceleration and energy release in solar flares and coronal jets
… including the characterization of double- sided cadmium telluride (CdTe) strip detectors, as well as the simulation work that helped to optimize the instrument design for flare observations. FOXSI-4 participated in NASA’s inaugural solar flare campaign along with the Hi- C Flare rocket. By …
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Fisher Information in X-ray/Gamma-ray Imaging Instrumentation Design
… a new type of a semiconductor detector, a Cadmium Telluride (CdTe) detector with double-sided-strip geometry developed by our collaborators at the Japan Aerospace Exploration Agency (JAXA). The statistical properties of the detector signals as a function of interaction positions in 3D (x, …
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A facile hybrid method to synthesize metal and metal chalcogenide nanoparticles using various capping groups
… method. Furthermore is the synthesis of zinc telluride (ZnTe) and cadmium telluride (CdTe) nanostructured materials also described. The nanomaterials are predominantly capped by organic ligands. The use of water soluble ligands such as triethanolamine (TEA) and cysteine is also reported. The …
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Carrier transport, recombination, and the effects of grain boundaries in polycrystalline cadmium telluride thin films for photovoltaics
Cadmium Telluride (CdTe), a chalcogenide semiconductor, is currently used as the absorber layer in one of the highest efficiency thin film solar cell technologies. Current efficiency records are over 22%. In 2011, CdTe solar cells accounted for ~8% of all solar cells installed. This is because, in …
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Performance evaluation of Photovoltaic (PV) modules under different deployment conditions
… commercially available technologies and included Cadmium Telluride (CdTe), Copper Indium diSelenide (CIS), amorphous silicon (a-Si)and polycrystalline silicon (p-Si) modules. Commercially available photovoltaic (PV) modules currently are comprised of two main groups: crystalline silicon modules …
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Development of ternary oxides for use in advanced front contacts in cadmium telluride solar cells by magnetron sputtering
Cadmium telluride (CdTe) solar cells are a commercially proven photovoltaic technology. Devices are composed of thin films which enable conversion of incident sunlight into electrical carriers and simultaneous transport of these carriers to an external load. At the front of the device, the layers …
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Electrodeposition of semiconductors for applications in thin film solar cells
… method were to be used for commercialisation. Cadmium telluride (CdTe) was electrodeposited from aqueous solution onto glass/fluorine doped tin oxide/cadmium sulphide substrates. Little improvement in XRD spectra was observed for annealed layers compared to the as-deposited material and the …
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Spectroscopic ellipsometry and dielectric modeling of thin film CdTe/CdS photovoltaic devices
… dielectric function of the absorbing layer of CdTe/CdS photovoltaic devices. Subsequently, this thesis aims to model the dielectric function of CdTe using critical point parabolic band theory (CPPB) and map the observed modulation to changes in the band structure associated with the …
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Zirconium nitride contacts for cadmium telluride solar cells
CdTe/CdS solar cells were produced with ZrN as a back contact by magnetron sputtering. ZrN films have been produced with crystalline quality and uniformity on CdTe. With good crystalline quality and uniformity on substrate materials, ZrN films have a low resistivity of 12.3 to 22.0 μΩ-cm, …
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Low temperature photoluminescence studies on sputter deposited cadmium sulphide/cadmium telluride heterojunctions and solar cells
Device quality CdS/CdTe heterostructures and completed solar cells (~12% efficient) have been studied using low-temperature photoluminescence (PL). The PL was studied as a function of temperature (82-295 K) and laser excitation power (0.02-2 mW). The CdS/CdTe junctions were grown on transparent …
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Inverted compound eye camera for second generation MRI compatible SPECT system
In this work, we will evaluate a novel design of the second-generation MRI compatible SPECT system, MRC-SPECT-II, based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 …
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Towards simultaneous single emission microscopy and magnetic resonance imaging
… This system is constructed with 40 small pixel CdTe detector modules assembled in a fully stationary ring SPECT geometry. Series of experiments have demonstrated that this system is capable of providing an imaging resolution of <500μm, when operated inside MR scanners. The ultrahigh resolution …
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Preliminary evaluation of X-ray fluorescence imaging and ultra-high resolution CdTe PET: the progression toward broader spectrum multi-modality tools for small animal neuroscientific investigation
… Fluorescence Emission Tomography (XFET) and CdTe Hybrid Pixel-Waveform (HPWF) PET, are evaluated as potentially complementary experimental preclinical instruments due the their combined ability to reveal biological information through the utilization of a broader portion of the …