Optoelectronic properties of SnO2 / TiO2 junctions

Kunst, M.; Moehl, Thomas; Wünsch, F.; Tributsch, H.

doi:10.1016/j.spmi.2005.08.062

Cited by 12 publications

(11 citation statements)

References 4 publications

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“…It is often used to study processes that limit transport, such as carrier trapping and recombination at grain boundaries. [13,[87][88][89][90] In our TRMC setup, films are excited with a laser pulse at λ = 420 nm, and the resulting light-induced change in the reflected microwave power is monitored. The obtained TRMC signal represents the product of the absorbance-normalized quantum yield (φ) and the sum of the mobilities of free charge carriers in the film (see the Experimental Section for details).…”

Section: (7 Of 14)mentioning

confidence: 99%

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi₂O₄

Gottesman

Levine

Schleuning

et al. 2021

Advanced Energy Materials

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fuel can be used on-site and on-demand but can also be stored and transported for off-site use. [5] However, practical PEC applications put stringent demands on photoabsorber materials in terms of efficiency, cost, and stability. Significant trade-offs have to be made, and this has thus far impeded the commercialization of PEC technology. [3,4] High solar to hydrogen conversion efficiencies approaching 20% have been achieved with photoelectrodes based on high-quality III-V semiconductors, such as GaInP 2 and GaAs. [6] However, their cost is likely to be prohibitive, and many of them suffer from instability under PEC operating conditions. The primary materials criteria are suitable bandgap energy to absorb a large fraction of solar photons with sufficient energies to enable water splitting, good electrical conductivity to enable photogenerated charge carrier extraction, favorable energy-band positions to enable carrier injection, and long-term stability in an aqueous environment. [4] Additionally, the material should be abundant and inexpensive in order to make PEC technology competitive with the chemical production of hydrogen from coal or natural gas. Almost all possible elemental and binary semiconductors have been investigated as photoelectrodes for water splitting, but none fulfill all the requirements. Therefore, the search will have to be expanded to ternary or even more complex materials. Metal-oxides offer many unique advantages as photoabsorber materials for PEC water splitting. [7-9] They have a variety of The widespread application of solar-water-splitting for energy conversion depends on the progress of photoelectrodes that uphold stringent criteria from photoabsorber materials. After investigating almost all possible elemental and binary semiconductors, the search must be expanded to complex materials. Yet, high structural control of these materials will become more challenging with an increasing number of elements. Complex metal-oxides offer unique advantages as photoabsorbers. However, practical fabrication conditions when using glass-based transparent conductive-substrates with low thermal-stability impedes the use of common synthesis routes of high-quality metal-oxide thin-film photoelectrodes. Nevertheless, rapid thermal processing (RTP) enables heating at higher temperatures than the thermal stabilities of the substrates, circumventing this bottleneck. Reported here is an approach to overcome phasepurity challenges in complex metal-oxides, showing the importance of attaining a single-phase multinary compound by exploring large growth parameter spaces, achieved by employing a combinatorial approach to study CuBi 2 O 4 , a prime candidate photoabsorber. Pure CuBi 2 O 4 photoelectrodes are synthesized after studying the relationship between the crystal-structures, synthesis conditions, RTP, and properties over a range of thicknesses. Single-phase photoelectrodes exhibit higher fill-factors, photoconversion efficiencies, longer carrier lifetimes, and increased stability than nonpure photoelectrodes...

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Section: (7 Of 14)mentioning

confidence: 99%

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi₂O₄

Gottesman

Levine

Schleuning

et al. 2021

Advanced Energy Materials

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“…Titanium dioxide (TiO 2 ) has been widely used as a photocatalyst for degrading a wide range of organic compounds [1]. In addition, TiO 2 has attracted extensive interests because of its potential applications to photocatalysis [2], chemical sensors [3], solar cell electrodes [4], and hydrogen storage materials [5]. However, the TiO 2 photocatalyst is known to have limitations for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Photocatalytic Efficiency of Palladium Doped-TiO<sub>2</sub> Nanoparticles

Elrady¹,

El-Sadek²,

Breky³

et al. 2013

ANP

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The effect of modification of TiO 2 with different palladium concentrations on its characteristics and photocatalytic efficiency was studied. Photo catalysts were prepared by the sol-gel method and were characterized by different techniques. A uniform distribution of palladium through the TiO 2 matrix was observed. The X-ray diffraction patterns of the pure and palladium doped TiO 2 were found to be quiet similar and the average particle size was not significantly changed. As a result of palladium doping, the UV-Vis analysis showed a red shift in the onset of wavelength of absorbance and the band gap was changed from 3.39 to 3.06 eV for the 0.3 wt% Pd/TiO 2 sample. Photo catalytic removal study of formic acid showed that the 0.3 wt% palladium doped photocatalyst exhibits the highest efficiency among the different palladium doped photocatalysts using sun light as the radiation source.

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“…Titanium oxide produced by the sol-gel route is an important material of great interest for applications to the fields of photo-catalysis, optics, photo-voltaic, and so forth. 13 The sol-gel process involves the low temperature synthesis of an inorganic network by a chemical reaction in solution, generally the hydrolysis and subsequent peptization of metallic alkoxides. 26 Many variables can influence the quality of the final product, for example, the choice of the solvent, use of acid or base catalysis, and use of stabilizing agents.…”

Section: Introductionmentioning

confidence: 99%

“…One of the many advantages of the sol-gel process is the possibility of forming well-controlled mixed oxides, by a judicious choice of the used precursors. 13 In the present study, the sol-gel method has been used to prepare SnO 2 -doped TiO 2 thin films and nanoparticles with different contents of SnO 2 . The effects of doping on the structures, optical energy gap, and photo-catalytical properties of the composite oxides have been studied.…”

Section: Introductionmentioning

confidence: 99%

Optical Absorption Property and Photo‐catalytic Activity of Tin Dioxide‐doped Titanium Dioxides

Xia

Jiang

et al. 2008

Chin. J. Chem.

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SnO 2 -doped TiO 2 films and composite oxide powders have been prepared by a sol-gel method. Ti(OC 4 H 9 ) 4 and SnCl 4 •5H 2 O were used as precursors and C 2 H 5 OH was used as solvent. The optical absorption measurements indicate that the composite oxide SnO 2 -TiO 2 thin films exhibit smaller optical energy band gaps than pure TiO 2 thin films and the optical energy band gap decreases as calcining temperature increases. X-ray diffraction was used to characterize the phase transition for the composite oxide powders at different calcining temperatures. Aanatase phase is the main crystal structure in both pure

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Optoelectronic properties of SnO2 / TiO2 junctions

Cited by 12 publications

References 4 publications

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi₂O₄

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi₂O₄

Characterization and Photocatalytic Efficiency of Palladium Doped-TiO<sub>2</sub> Nanoparticles

Optical Absorption Property and Photo‐catalytic Activity of Tin Dioxide‐doped Titanium Dioxides

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Optoelectronic properties of SnO2 / TiO2 junctions

Cited by 12 publications

References 4 publications

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi2O4

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi2O4

Characterization and Photocatalytic Efficiency of Palladium Doped-TiO&lt;sub&gt;2&lt;/sub&gt; Nanoparticles

Optical Absorption Property and Photo‐catalytic Activity of Tin Dioxide‐doped Titanium Dioxides

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Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi₂O₄

Overcoming Phase‐Purity Challenges in Complex Metal Oxide Photoelectrodes: A Case Study of CuBi₂O₄

Characterization and Photocatalytic Efficiency of Palladium Doped-TiO<sub>2</sub> Nanoparticles