Photocarrier dynamic measurement of rutile TiO2 films prepared by RF magnetron reactive sputtering

Abstract

In this work, rutile titanium dioxide (TiO 2) films were prepared on quartz and SiO 2 /Si substrates utilizing RF magnetron reactive sputtering technology. Crystal structure, surface morphology and optical property of these films were characterized to verify the obtainment of well crystalline rutile TiO 2 films. The dynamics of photocarriers were studied by using temporally resolved transient absorption measurements. The differential reflectivity as a function of pump fluence was investigated. We also directly obtained a carrier lifetime of about 286 ps. The absorption cross-section and the absorption coefficient of free carrier at 800 nm were 1.87×10-17 cm 2 and 32.9 cm-1 , respectively.

Synthesis and color properties of the TiO2@CoAl2O4 blue pigments with low cobalt content applied in ceramic glaze

“…As seen from the curve a, the peaks at 241, 449, and 612 cm À1 were attributed to two-phonon scattering, E g and A 1g modes of rutile TiO 2 , respectively. [25][26][27] As the calcinations temperature increasing, the Raman bands intensities of rutile TiO 2 in complex pigments elevated, which was consistent with the XRD results. The peak located at 206 cm À1 was assigned to the lowest frequency T 2g symmetry species corresponding to the (Co, Al)-O bending vibration (d (Co, Al)-O ) in the CoAl 2 O 4 phase.…”

“…Figure B showed the Raman spectra of the TiO 2 @CoAl 2 O 4 complex pigments calcined at 800 and 1100°C, respectively. As seen from the curve a, the peaks at 241, 449, and 612 cm −1 were attributed to two‐phonon scattering, E g and A 1g modes of rutile TiO 2 , respectively . As the calcinations temperature increasing, the Raman bands intensities of rutile TiO 2 in complex pigments elevated, which was consistent with the XRD results.…”

Tunable photovoltaic performance of preferentially oriented rutile TiO2 nanorod photoanode based dye sensitized solar cells with quasi-state electrolyte

“…A crack-free single crystal 1D nanostructure has the advantage of yield trapping a free electron pathway and has good electrical contact with the collection point compared to bulk nanosystems [1,26,28,29]. Even though rutile TiO 2 has excellent stability and optical-electrical properties, very few attempts have been made to fabricate 1D rutile TiO 2 based DSSCs [30][31][32][33]. Based on the above facts this article primarily reports on (i) crack-free oriented growth of 1D rutile TiO 2 of various lengths and aspect ratios upon a fluorine-doped tin oxide (FTO) substrate, (ii) the fabrication of DSSCs using an acetamidebased quasi-state electrolyte, (iii) and the relation between the geometries of photoanodes and the photovoltaic performance of fabricated DSSCs.…”