Dipole- and charge transfer contributions to the work function change of semiconducting thin films: experiment and theory

Geistlinger, Helmut; Eisele, I.; Flietner, B.; Winter, R.

doi:10.1016/s0925-4005(96)01926-0

Cited by 20 publications

(8 citation statements)

References 5 publications

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“…There are some reports that deal with work function-based NO 2 sensors using metal oxide thin films or fine particles. The adsorbed NO 2 gas increased IrO 2 work function [27], but decreased Ga 2 O 3 work function [28]. If one assumes that the work function of the Al electrode decreases by NO 2 adsorption (including effects of possible thin oxide top layer), Eq.…”

Section: Discussionmentioning

confidence: 99%

Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis

Suehiro¹,

Imakiire²,

Hidaka³

et al. 2006

Sensors and Actuators B: Chemical

127

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Section: Discussionmentioning

confidence: 99%

Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis

Suehiro¹,

Imakiire²,

Hidaka³

et al. 2006

Sensors and Actuators B: Chemical

127

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“…In principle, the prerequisite for catalytic reactions is the adsorption of reagents on catalysts. [60][61][62][63][64] Commonly, metal catalysts connect with reagents through d-orbital electrons, 61 and semiconductor catalysts through charge-transfer chemisorption, [62][63][64] specically, acceptor-like species (such as I 2 and I 3 À ) adsorb at cation (Fe 2+ ) sites of an ionic semiconductor. 64 Therefore, the catalytic performance of a semiconductor catalyst is sensitive to its surface structure.…”

Section: Journal Of Materials Chemistry a Papermentioning

confidence: 99%

Pyrite nanorod arrays as an efficient counter electrode for dye-sensitized solar cells

et al. 2013

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Pyrite (FeS 2 ) nanorod arrays were produced on a fluorine doped tin oxide substrate by sulfurizing FeO(OH) nanorods, and then tested as the counter electrode (CE) for dye-sensitized solar cells (DSSCs). FeS 2 nanorods show better catalytic properties than the FeS 2 film and the Pt film due to their active facets, which helps to achieve a high short-circuit photocurrent density (J sc ) of DSSCs. On the other hand, FeS 2 nanorods have lower interface resistance than FeS 2 thin films, which contributes to a higher fill factor (FF) of DSSCs. As a result, the solar cell with a CE of FeS 2 nanorods exhibits an excellent power conversion efficiency, which is comparable to that of traditional DSSCs with a Pt CE.

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“…[3] As a consequence, ambitious efforts have been made to calculate the surface coverage by different types of ionosorbed oxygen [31,[58][59][60] ( Figure 5) and to correlate the overall conductance of the sensors with the chemical state of charged oxygen species at the surface. [6,61] Two assumptions are made 1) that thermally stimulated dissociation of molecular oxygen and formation of atomic oxygen ions occurs and 2) that there is spectroscopic and theoretical evidence for the species.…”

Section: Oxygen Ionosorption On Semiconductorsmentioning

confidence: 99%

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

2006

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Tin dioxide is the most commonly used material in commercial gas sensors based on semiconducting metal oxides. Despite intensive efforts, the mechanism responsible for gas-sensing effects on SnO(2) is not fully understood. The key step is the understanding of the electronic response of SnO(2) in the presence of background oxygen. For a long time, oxygen interaction with SnO(2) has been treated within the framework of the "ionosorption theory". The adsorbed oxygen species have been regarded as free oxygen ions electrostatically stabilized on the surface (with no local chemical bond formation). A contradiction, however, arises when connecting this scenario to spectroscopic findings. Despite trying for a long time, there has not been any convincing spectroscopic evidence for "ionosorbed" oxygen species. Neither superoxide ions O(2)(-), nor charged atomic oxygen O,(-) nor peroxide ions O(2)(2-) have been observed on SnO(2) under the real working conditions of sensors. Moreover, several findings show that the superoxide ion does not undergo transformations into charged atomic oxygen at the surface, and represents a dead-end form of low-temperature oxygen adsorption on reduced metal oxide.

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Dipole- and charge transfer contributions to the work function change of semiconducting thin films: experiment and theory

Cited by 20 publications

References 5 publications

Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis

Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis

Pyrite nanorod arrays as an efficient counter electrode for dye-sensitized solar cells

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

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Dipole- and charge transfer contributions to the work function change of semiconducting thin films: experiment and theory

Cited by 20 publications

References 5 publications

Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis

Schottky-type response of carbon nanotube NO2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis

Pyrite nanorod arrays as an efficient counter electrode for dye-sensitized solar cells

Interplay between O2 and SnO2: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

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Product

Resources

About

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen