Search results for "Ionic conduction"

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Thermal activated carrier transfer between InAs quantum dots in very low density samples

2010

In this work we develop a detailed experimental study of the exciton recombination dynamics as a function of temperature on QD-ensembles and single QDs in two low density samples having 16.5 and 25 dots/¼m2. We corroborate at the single QD level the limitation of the exciton recombination time in the smallest QDs of the distribution by thermionic emission (electron emission in transient conditions). A portion of these emitted carriers is retrapped again in other (larger) QDs, but not very distant from those emitting the carriers, because the process is limited by the diffusion length at the considered temperature.

HistoryWork (thermodynamics)Condensed Matter::Otherbusiness.industryChemistryExcitonThermionic emissionElectron66.30.H- Self-diffusion and ionic conduction in nonmetals78.67.Hc Quantum dotsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMolecular physicsComputer Science ApplicationsEducationCondensed Matter::Materials Science78.55.Cr III-V semiconductorsQuantum dotThermalOptoelectronics71.35.-y Excitons and related phenomenaDiffusion (business)businessRecombination79.40.+z Thermionic emissionJournal of Physics: Conference Series
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Asymmetric nanopore rectification for ion pumping, electrical power generation, and information processing applications

2011

Single-track, asymmetric nanopores can currently be functionalised with a spatially inhomogeneous distribution of fixed charges and a variety of pore tip shapes. Optimising the asymmetric nanopore characteristics is crucial for practical applications in nanofluidics. We have addressed here this question for three cases based on different input/output chemical and electrical signals: (i) ion pumping up a concentration gradient by means of a periodic, time-dependent bias potential, (ii) information processing with a single nanopore acting as the nanofluidic diode of a logic gate, and (iii) electrical energy harvesting using a nanopore that separates two solutions of different salt concentrati…

Nanofluidic diodes as logic gatesGeneral Chemical EngineeringMicrofluidicsConcentration gradientsNanofluidicsNanotechnologyPumpsIonNanoporesRectificationIonic conductionIonic transportElectrochemistryHarvestingDiodeIonsChemistrybusiness.industryConcentration (process)Energy harvestingElectric potential energyNanofluidicsCharge densityLogic gatesElectric rectifiersDiodesData processingNanoporeIon pumpingFISICA APLICADAOptoelectronicsbusinessSynthetic nanopores
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