FTIR and XPS investigation of Er-doped SiO2–TiO2 films

Fang, Q.; Meier, Mark S.; Yu, J.J.; Wang, Z.M.; Zhang, J.-Y.; Jian-gang, WU; Kenyon, Anthony J.; Hoffmann, P.; Boyd, Ian W.

doi:10.1016/j.mseb.2003.08.047

Cited by 73 publications

(35 citation statements)

References 30 publications

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“…Furthermore, it was reported that the pairing effect between the ion-dopants led to the appearance of a solid solution in Er 3+ -doped TiO 2 sol-gel layer [32]. Erbium ion doping might be more favorable to the separation of photoinduced electron-hole pairs, which would lead to the enhancement of photocatalytic activity [33].…”

Section: Discussionmentioning

confidence: 99%

The effect of erbium on the adsorption and photodegradation of orange I in aqueous Er3+-TiO2 suspension

Chen

Hou

Zhou

et al. 2006

Journal of Hazardous Materials

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Section: Discussionmentioning

confidence: 99%

The effect of erbium on the adsorption and photodegradation of orange I in aqueous Er3+-TiO2 suspension

Chen

Hou

Zhou

et al. 2006

Journal of Hazardous Materials

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“…To further study the interface, the BE spectra of Ti 2p, O 1s, and Si 2p signals at the interface were analyzed and are shown in Figures 2b-d, respectively. After deconvolution, the Ti 2p 2p3/2 spectra have three peaks, which are associated with TiO (454.7 eV), Ti2O3 (457 eV), and TiO2 (458.7 eV) [22], indicating that oxygen is deficient in the TiO2 film. The O1s spectra also have three peaks, which are associated with TiO2 (530.3 eV), oxygendeficient TiO2 (531.1 eV), and SiO2 (532.2 eV) [22,23].…”

Section: Resultsmentioning

confidence: 99%

“…After deconvolution, the Ti 2p 2p3/2 spectra have three peaks, which are associated with TiO (454.7 eV), Ti2O3 (457 eV), and TiO2 (458.7 eV) [22], indicating that oxygen is deficient in the TiO2 film. The O1s spectra also have three peaks, which are associated with TiO2 (530.3 eV), oxygendeficient TiO2 (531.1 eV), and SiO2 (532.2 eV) [22,23]. The oxygen deficiency implies the existence of Ti dangling bonds, which cause gap states in the LPD-TiO2 film.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature, Chemically Grown Titanium Oxide Thin Films with a High Hole Tunneling Rate for Si Solar Cells

Lee

Lin

et al. 2016

Energies

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Abstract:In this paper, we propose a chemically grown titanium oxide (TiO 2 ) on Si to form a heterojunction for photovoltaic devices. The chemically grown TiO 2 does not block hole transport. Ultraviolet photoemission spectroscopy was used to study the band alignment. A substantial band offset at the TiO 2 /Si interface was observed. X-ray photoemission spectroscopy (XPS) revealed that the chemically grown TiO 2 is oxygen-deficient and contains numerous gap states. A multiple-trap-assisted tunneling (TAT) model was used to explain the high hole injection rate. According to this model, the tunneling rate can be 10 5 orders of magnitude higher for holes passing through TiO 2 than for flow through SiO 2 . With 24-nm-thick TiO 2 , a Si solar cell achieves a 33.2 mA/cm 2 photocurrent on a planar substrate, with a 9.4% power conversion efficiency. Plan-view scanning electron microscopy images indicate that a moth-eye-like structure formed during TiO 2 deposition. This structure enables light harvesting for a high photocurrent. The high photocurrent and ease of production of chemically grown TiO 2 imply that it is a suitable candidate for future low-cost, high-efficiency solar cell applications.

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“…It is known that the large surface area is an important contribution to its excellent activity because it can absorb more oxygen and molecular water. Second, the hydroxyl content in the films obtained with the addition of SDBS is greater than that without the use of SDBS (as shown in Table 2), the increase of the hydroxyl content on the surface of TiO 2 is beneficial to the enhancement of photocatalytic activity [28]. The third factor is that the relative content of anatase increases with the increasing concentration of SDBS.…”

Section: Surface Characterizationmentioning

confidence: 95%

Synthesis of TiO2 films on glass slides by the sol-gel method and their photocatalytic activity

et al. 2009

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Titanium dioxide (TiO 2 ) films with rod-like and sphere-like TiO 2 particles were prepared on glass slides employing the sol-gel method. The shape and size of TiO 2 particles were controlled using different concentrations of sodium dodecylbenzensulfonate (SDBS). By increasing the mole ratio of SDBS, the shape of TiO 2 particles transformed from rod-like to sphere-like. Also, the size of TiO 2 particles became gradually smaller. Then, the size became bigger when an excess amount of SDBS was added. The films were mainly composed of anatase titania and the relative content of anatase increased with the increasing amount of SDBS. The photocatalytic activity of the TiO 2 films that were added with SDBS was higher than that without SDBS. When the concentration of SDBS was 8.0 at%, the sample exhibited the best photocatalytic activity.

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FTIR and XPS investigation of Er-doped SiO2–TiO2 films

Cited by 73 publications

References 30 publications

The effect of erbium on the adsorption and photodegradation of orange I in aqueous Er3+-TiO2 suspension

The effect of erbium on the adsorption and photodegradation of orange I in aqueous Er3+-TiO2 suspension

Low-Temperature, Chemically Grown Titanium Oxide Thin Films with a High Hole Tunneling Rate for Si Solar Cells

Synthesis of TiO2 films on glass slides by the sol-gel method and their photocatalytic activity

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