Low-frequency noise properties of beryllium δ-doped GaAs/AlAs quantum wells near the Mott transition

Palenskis, Vilius; Matukas, Jonas; Pralgauskaitė, Sandra; Seliuta, D.; Kašalynas, Irmantas; Subačius, L.; Valušis, Gintaras; Khanna, Suraj P.; Linfield, E. H.

doi:10.1063/1.4792741

Cited by 5 publications

(3 citation statements)

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“…Electrical conduction in such composite materials based on a dielectric matrix and a conductive filler can be achieved in two ways via charge carrier transport: within the conductive structure of the filler or through the dielectric matrix by tunneling between the filler particles [ 15 , 16 ]. The characteristics of low-frequency electrical noise are well known to be extremely sensitive to the physical processes corresponding to charge carrier transport mechanisms in various materials and devices [ 17 , 18 , 19 , 20 ]. However, papers on low-frequency electrical fluctuations in carbon composite devices are very rare.…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistivity and Microwave Properties of Carbon Fiber Felt Composites

et al. 2022

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We present studies on the microwave properties, electrical resistivity, and low-frequency (10 Hz–20 kHz) noise characteristics in the temperature range of 78 K to 380 K of composite materials made from bisphenol A-based epoxy resin and carbon fiber felts. Two types of carbon fibers were used, derived from polyacrylonitrile or regenerated cellulose. We show that these structures are suitable for electromagnetic shielding applications, especially in the direction parallel to the carbon fibers. The low-frequency voltage fluctuations observed in these materials are of the 1/fα, and the noise intensity is proportional to the square of the voltage. The characteristics of the investigated materials show an instability in the temperature range from 307 K to 332 K. This effect is followed by an increase in resistivity and noise intensity, but it does not change the character of the noise, and this instability vanishes after a few repeated heating and cooling cycles.

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Section: Introductionmentioning

confidence: 99%

Electrical Resistivity and Microwave Properties of Carbon Fiber Felt Composites

et al. 2022

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“…The low‐frequency noise spectroscopy is a very sensitive experimental tool that gives information on physical processes and enables clearing‐up the conduction mechanisms in composite materials . It gives a valuable information on the charge carrier transport and conduction mechanisms in new materials .…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon nanotube surface treatment on resistivity and low‐frequency noise characteristics of epoxy‐based composites

et al. 2018

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Resistivity and low‐frequency (10 Hz–20 kHz) noise characteristics of composite materials with multi‐walled carbon nanotubes (MWCNTs) of different surface treatment, that is, MWCNTs covered with bisphenol‐A based liquid epoxy resin (epoxy‐grafted) and polyethylene polyamine (amino‐grafted), have been carried out over the temperature range from 73 to 380 K. The resistivity of the investigated materials decreases with temperature increase up to 250 K; at higher temperatures polymer matrix expansion leads to the resistivity increase and above 340 K the conductivity in the matrix becomes significant. Low‐frequency noise spectra of the investigated materials are 1/fα‐type and noise spectral density is proportional to the squared voltage. The observed fluctuations in the investigated materials are resistance fluctuations. The conduction in the investigated composites is caused by tunneling inside and between MWCNTs controlled by charge carrier capture and release processes in localized states. MWCNT's surface treatment by polyethylene polyamine leads to the larger density of surface states what causes lower resistivity and more intensive low‐frequency fluctuations. POLYM. COMPOS., 39:E1224–E1230, 2018. © 2018 Society of Plastics Engineers

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“…Electronic noise can originate from dark currents, temperature fluctuations, and trap states. The fundamental noise components (shot noise and thermal noise), are frequency independent, and can be controlled to some extent by the choice of device architecture, and through optimizing the detailed design 1 , including the choice of active materials, growth technique, operating temperature, and doping levels.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency noise properties of p-type GaAs/AlGaAs heterojunction detectors

Wolde

Lao

Pitigala

et al. 2016

Infrared Physics & Technology

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We have measured and analyzed, at different temperatures and bias voltages, the dark noise spectra of GaAs/AlGaAs heterojunction infrared photodetectors, where a highly doped GaAs emitter is sandwiched between two AlGaAs barriers. The noise and gain mechanisms associated with the carrier transport are investigated, and it is shown that a lower noise spectral density is observed for a device with a flat barrier, and thicker emitter. Despite the lower noise power spectral density of flat barrier device, comparison of the dark and photocurrent noise gain between flat and graded barrier samples confirmed that the escape probability of carriers (or detectivity) is enhanced by grading the barrier. The grading suppresses recombination owing to the higher momentum of carriers in the barrier. Optimizing the emitter thickness of the graded barrier to enhance the absorption efficiency, and increase the escape probability and lower the dark current, enhances the specific detectivity of devices.

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Low-frequency noise properties of beryllium δ-doped GaAs/AlAs quantum wells near the Mott transition

Cited by 5 publications

References 40 publications

Electrical Resistivity and Microwave Properties of Carbon Fiber Felt Composites

Electrical Resistivity and Microwave Properties of Carbon Fiber Felt Composites

Influence of carbon nanotube surface treatment on resistivity and low‐frequency noise characteristics of epoxy‐based composites

Low-frequency noise properties of p-type GaAs/AlGaAs heterojunction detectors

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