High temperature Hall measurement setup for thin film characterization

Adnane, Lhacene; Gokirmak, Ali; Silva, Helena

doi:10.1063/1.4959222

Cited by 15 publications

(11 citation statements)

References 17 publications

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“…Also, the electronic conductivity of Co-derived oxide species is higher than that of Mn-based oxides. Adding just 10 atomic % Co to MnO increases its intrinsic conductivity by more than an order of magnitude, as confirmed by Van Der Pauw measurements 28 (Table S1 in the Supporting Information).…”

Section: ■ Introductionsupporting

confidence: 62%

Cobalt Doping as a Pathway To Stabilize the Solid-State Conversion Chemistry of Manganese Oxide Anodes in Li-Ion Batteries

et al. 2018

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Metal oxides have been widely studied in recent years to replace commercial graphite anodes in lithium ion batteries. Among the metal oxides, manganese oxide has a high theoretical capacity, low cost, and is environmentally friendly. However, many MnO materials have shown limited reaction reversibility and poor conversion kinetics. To understand why, in this paper we investigate the mechanism, kinetics, and reversibility for the solid-state conversion reaction of MnO with Li + . We definitively show, for the first time, that during repeated reaction cycles, multiple reaction pathways occur that lead not only to the reformation of MnO but also higher oxidation-state Mn 3 O 4 which when combined with the poor intrinsic electronic conductivity of both manganese oxide species results in a rapid loss in the amount of charge that can be stored in these materials. Learning this, the approach in this study was to use cobalt doping to concomitantly stabilize the redox behavior of manganese (allowing for the gradual transformation of MnO to Mn 3 O 4 over time) and to increase the intraparticle electronic conductivity of the active layer. The result is an active material, Mn 0.9 Co 0.1 O, that exhibits excellent charge stability and conversion kinetics (near 600 mAh/g at a rate of 400 mA/g), even over hundreds of reaction cycles.

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Section: ■ Introductionsupporting

confidence: 62%

Cobalt Doping as a Pathway To Stabilize the Solid-State Conversion Chemistry of Manganese Oxide Anodes in Li-Ion Batteries

et al. 2018

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“…This can be particularly helpful when there are other magnetic effects to consider in the Hall measurements, such as the anomalous Hall effect, and the measured Hall resistance does not seem to correlate well with the actual charge carrier concentration (R H = 1/en H ) or mobility [8]. The weighted mobility measurement is also practicable in regimes where the Hall resistivity measurement is difficult, such as at high temperatures or with low mobility bulk systems [9,2].…”

Section: Mobilitymentioning

confidence: 99%

Weighted Mobility

et al. 2020

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Engineering semiconductor devices requires an understanding of charge carrier mobility. Typically mobilities are estimated using measurements of the Hall effect and electrical resistivity. Such measurements are routinely performed at room temperature and below in materials with mobilities greater than 1cm 2 /Vs. With the availability of combined Seebeck coefficient and electrical resistivity measurement systems, it is now easy to measure the weighted mobility (electron mobility weighted by the density of electronic states). Here we introduce a simple method to calculate the weighted mobility from combined Seebeck coefficient and electrical resistivity measurements that gives good results at room temperature and above, and for mobilities as low as 10 −3 cm 2 /Vs.

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“…The maximum measurement temperatures for these instruments, as specified by the manufacturer, are 500 • C (Ecopia, 2009) and 527 • C (MMR Technologies, 2013). The disadvantage of externally heated and good thermal conductive materials is clearly shown by the research group of Adnane et al (2016). In their work, the sample holder is based on a brass chuck with two embedded cartridge heaters with a power of 300 W each.…”

Section: Motivationmentioning

confidence: 99%

Novel, low-cost device to simultaneously measure the electrical conductivity and the Hall coefficient from room temperature up to 600 °C

Werner

Kita

Gollner³

et al. 2021

J. Sens. Sens. Syst.

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Abstract. A novel measurement device for simultaneous high temperature measurements of the electrical conductivity and the Hall coefficient has been developed. Simulations were used to design a suitable screen-printed planar platinum heating structure that generates temperatures of up to 600 ∘C by Joule heating. Simulations of the temperature distribution have been validated using thermal imaging. With the hardware setup of two permanent magnetic yoke systems with a magnetic flux density of ±760 mT, the electrical conductivity and the charge carrier densities of a silicon wafer and a gold film were measured, as examples of a typical semiconductor with low charge carrier densities but high mobility and a metal representing materials with very high charge carrier densities but moderate mobilities, respectively. Measurements were compared with data from the literature to validate the functionality of the novel, low-cost measurement device.

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High temperature Hall measurement setup for thin film characterization

Cited by 15 publications

References 17 publications

Cobalt Doping as a Pathway To Stabilize the Solid-State Conversion Chemistry of Manganese Oxide Anodes in Li-Ion Batteries

Cobalt Doping as a Pathway To Stabilize the Solid-State Conversion Chemistry of Manganese Oxide Anodes in Li-Ion Batteries

Weighted Mobility

Novel, low-cost device to simultaneously measure the electrical conductivity and the Hall coefficient from room temperature up to 600 °C

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