The electrical conductivity and thermoelectric power dependence on the thicknesses for thermally deposited thin CdS films

Abdullah, Rasha A.; Atallah, Faris S.; Dahham, Najat A.; Razooqia, Mohammed A.; Nasir, Eman M.; Saeed, Nada M.

doi:10.1063/1.4751626

Cited by 5 publications

(9 citation statements)

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“…Additionally, it is possible to gain confined field enhancement through a narrow nanogap because the electromagnetic resonance effect . To estimate these potentials, we choose cadmium sulfide (CdS) as a model catalyst, which is a direct band gap semiconductor ( E g ≈2.42 eV) and has shown emerging activity for CO 2 ‐to‐CO conversion . Recently, CdS has also attracted great attention for diverse applications, such as heterojunction solar cells, photo/electrocatalytic CO 2 reduction and water splitting .…”

Section: Resultsmentioning

confidence: 99%

High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO₂ Electroreduction

et al. 2020

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A considerable challenge in the conversion of carbon dioxide into useful fuels comes from the activation of CO2 to CO2.− or other intermediates, which often requires precious‐metal catalysts, high overpotentials, and/or electrolyte additives (e.g., ionic liquids). We report a microwave heating strategy for synthesizing a transition‐metal chalcogenide nanostructure that efficiently catalyzes CO2 electroreduction to carbon monoxide (CO). We found that the cadmium sulfide (CdS) nanoneedle arrays exhibit an unprecedented current density of 212 mA cm−2 with 95.5±4.0 % CO Faraday efficiency at −1.2 V versus a reversible hydrogen electrode (RHE; without iR correction). Experimental and computational studies show that the high‐curvature CdS nanostructured catalyst has a pronounced proximity effect which gives rise to large electric field enhancement, which can concentrate alkali‐metal cations resulting in the enhanced CO2 electroreduction efficiency.

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Section: Resultsmentioning

confidence: 99%

High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO₂ Electroreduction

et al. 2020

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“…Sensors 2020, 20, x FOR PEER REVIEW 9 of 11 A semiconductor material, cadmium sulfide in this case, is the main component of an LDR. In the temperature range analyzed in this work, its conductivity increases with temperature following a non-linear behavior [17,22]. Indeed, an exponential tendency can be expected, as shown by negative temperature coefficient thermistors.…”

Section: Thermal Compensationmentioning

confidence: 69%

Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy

Román-Raya

Ruiz-García

Escobedo

et al. 2020

Sensors

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Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry. To demonstrate this, a complete characterization of the response to radiation of commercial LDRs has been conducted in terms of sensitivity, reproducibility and thermal correction under different bias voltages. Irradiation sessions have been applied under the common conditions in radiotherapy treatments using a hospital linear accelerator. Moreover, the same electrometer used for the ionization chamber has also been successfully used for LDRs. In comparison with the sensitivity achieved for the ionization chamber (0.2 nC/cGy at 400 V bias voltage), higher sensitivities have been measured for the proposed LDRs, ranging from 0.24 to 1.04 nC/cGy at bias voltages from 30 to 150 V, with a reproducibility uncertainty among samples of around 10%. In addition, LDR temperature dependence has been properly modeled using the simple thermistor model so that an easy thermal drift correction of dose measurements can be applied. Therefore, experimental results show that LDRs can be a reliable alternative to dosimetric sensors with the advantages of low size, affordable cost and the fact that it could be adopted with minimal changes in routine dosimetry quality control since the same readout system is fully compatible.

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“…Also positive values of See beck coefficient mean that all prepared films are p-type. Dhawale et al [4] and Abdullah [5] gave credence to these results. Hopping energy (∆W) that calculated from the difference between E a dc and E th was decreased with increasing thickness, where as E a dc and E th increase with heat treatment, as illustrated Table 1.…”

Section: Fig 3: Thermoelectric Powervs 10 3 /T For As Deposited and mentioning

confidence: 78%

“…This thermally generated voltage is called See beck voltage (V emf ), which is preoperational to the temperature that is created across films. See beck coefficient (S emf ), on other words, thermoelectric power (P emf ) is defined by [4,5]: Fig. 2 illustrates See beck voltage which was proportional to the temperature, which created across the CdTe films.…”

Section: Experimental Stepsmentioning

confidence: 99%

Thermoelectric power for thermally deposited cadmium telluride films

Alias¹

2019

IJP

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Thermal evaporation method has used for depositing CdTe filmson corning glass slides under vacuum of about 10-5mbar. Thethicknesses of the prepared films are400 and 1000 nm. The preparedfilms annealed at 573 K. The structural of CdTe powder and preparedfilms investigated. The hopping and thermal energies of as depositedand annealed CdTe films studied as a function of thickness. Apolycrystalline structure observed for CdTe powder and preparedfilms. All prepared films are p-type semiconductor. The hoppingenergy decreased as thickness increased, while thermal energyincreased.

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The electrical conductivity and thermoelectric power dependence on the thicknesses for thermally deposited thin CdS films

Cited by 5 publications

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High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO₂ Electroreduction

High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO₂ Electroreduction

Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy

Thermoelectric power for thermally deposited cadmium telluride films

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The electrical conductivity and thermoelectric power dependence on the thicknesses for thermally deposited thin CdS films

Cited by 5 publications

References 0 publications

High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO2 Electroreduction

High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO2 Electroreduction

Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy

Thermoelectric power for thermally deposited cadmium telluride films

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Product

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High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO₂ Electroreduction

High‐Curvature Transition‐Metal Chalcogenide Nanostructures with a Pronounced Proximity Effect Enable Fast and Selective CO₂ Electroreduction