2015
DOI: 10.1002/pssb.201552518
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Deep-level transient spectroscopy at platinum/titanium-dioxide hydrogen sensors

Abstract: Abstractauthoren Deep traps in platinum/mesoporous‐titanium‐dioxide hydrogen sensors are studied by deep‐level transient spectroscopy (DLTS) before, during, and after the gas detection. This is possible for atmospheric hydrogen volume fractions in the low ppm regime where the Schottky barrier at the normalPt/TiO2 interface is retained. In the absence of hydrogen, two deep levels with binding energies of 470 and 720 meV are found. Their occurrence increases as hydrogen is offered, but to a smaller extent than t… Show more

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Cited by 3 publications
(4 citation statements)
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“…Depending on the material time constants, the transient currents are expected to change as the field frequency increase. 52 At 300 K, the h-rCap capacitance profile (Figure 3a) was found to be f-dependent within the experimental range investigated (20 < f < 10 5 Hz). However, at low temperatures (viz., T = 6 K), the capacitance of h-rCap is characterized by a well-established plateau for f < 10 5 Hz (Figure 3a).…”
Section: Resultsmentioning
confidence: 67%
See 1 more Smart Citation
“…Depending on the material time constants, the transient currents are expected to change as the field frequency increase. 52 At 300 K, the h-rCap capacitance profile (Figure 3a) was found to be f-dependent within the experimental range investigated (20 < f < 10 5 Hz). However, at low temperatures (viz., T = 6 K), the capacitance of h-rCap is characterized by a well-established plateau for f < 10 5 Hz (Figure 3a).…”
Section: Resultsmentioning
confidence: 67%
“…The direct product of the CuPc incorporation within the system is the emergence of transient currents composed of charge carriers that populate/depopulate the OSC trap centers as f changes. Depending on the material time constants, the transient currents are expected to change as the field frequency increase . At 300 K, the h-rCap capacitance profile (Figure a) was found to be f -dependent within the experimental range investigated (20 < f < 10 5 Hz).…”
Section: Resultsmentioning
confidence: 99%
“…Consequently, the static dielectric constant s is reported to be between 90 -170 at room temperature [185,186] with a pronounced dependence on temperature [186] and sample treatment [187]. TiO 2 is used in applications such as solar cells [188,189], photo-catalysis [3,4,[190][191][192][193][194][195] and hydrogen sensors [196][197][198][199], but also in other types of industries such as for pigments in paints [200]. In most applications, TiO 2 is being used in poly-crystalline form, for example, as nano-crystals or powders [188,192,200].…”
Section: Rutile Titanium Dioxidementioning
confidence: 99%
“…The changes in barrier height strongly depend on the surface orientation of r-TiO 2 [284]. Notably, Pd/TiO 2 as well as Pt/TiO 2 systems are used as hydrogen sensors [196][197][198][199]. The diffusion of charged species is altered by the electrical field present in the Schottky junction [294], and hence out-or in-diffusion of H into r-TiO 2 might be different for the space-charge region as compared to the bulk [259].…”
Section: Junctions Between Rutile Titanium Dioxide and Various Metalsmentioning
confidence: 99%