Ultraviolet Photoelectron Spectroscopy

Himpsel, F. J.

doi:10.1002/0471266965.com061.pub2

Cited by 4 publications

(6 citation statements)

References 29 publications

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“…The conduction band energy ( E C ) can be calculated by adding the E g of PDACuBr 4 to E V , resulting in the value of −4.08 eV. For n‐type semiconductor, the carriers are dominated by the conduction electrons when E F is located near E C 58,59 . Apparently, the Fermi level of E F is located much closer to the conduction band (Figure 3(D)), implying that PDACuBr 4 is an n‐type semiconductor.…”

Section: Resultsmentioning

confidence: 99%

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Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Kang

Xiong

et al. 2022

EcoMat

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Great achievements about lead‐based halide perovskites have been made in the fields of photovoltaic solar cells, light emitting diodes, photodetectors, and thermoelectric devices. However, the toxicity and instability of lead‐based materials hinder their practical application. Herein, we used propane‐1,3‐diammonium cation to construct a copper‐based halide perovskite material (NH3C3H6NH3)CuBr4 with a two‐dimensional layered structure. This material exhibits a suitable bandgap of 1.71 eV for a broad‐band absorption. Dense and flexible (NH3C3H6NH3)CuBr4 thin film can be obtained by simple spin‐coating of the solution using green solvent DMSO. Furthermore, (NH3C3H6NH3)CuBr4 shows excellent stability towards temperature, humidity and UV‐light. Finally, the (NH3C3H6NH3)CuBr4 thin film shows a reasonable Seebeck coefficient of −13.8 μV K−1 and a power factor of 1.70 μW m−1 K−2 at 298 K, demonstrating the great potential for flexible n‐type thermoelectric application.

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Section: Resultsmentioning

confidence: 99%

“…For n-type semiconductor, the carriers are dominated by the conduction electrons when E F is located near E C . 58,59 Apparently, the Fermi level of E F is located much closer to the conduction band (Figure 3(D)), implying that PDACuBr 4 is an n-type semiconductor.…”

Section: Optical Propertiesmentioning

confidence: 94%

Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Kang

Xiong

et al. 2022

EcoMat

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“…IPES measurements, in isochromat mode, , were performed in the same chamber as XPS and UPS, using a low-energy electron gun and a bandpass photon detector from PSP Vacuum Technology Ltd. The electron gun contained a BaO cathode, emitting electrons with an energy spread of ca.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Metallization of TiO₂(110) with Gold and Lithium

Somaratne

Whitten

2021

J. Phys. Chem. C

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Gold and lithium have been deposited on clean, stoichiometric TiO 2 (110) to study the evolution of the electronic structure of the surface. For thermally deposited gold, X-ray and ultraviolet photoelectron spectroscopies (XPS and UPS) indicate that the first monolayer (ML) grows two dimensionally, while additional gold forms islands, and that the surface becomes metallic by 1 ML. Downward band bending for low coverage is confirmed by a comparison of the XPS valence and UPS spectra, which have different detection depths. Inverse photoelectron spectroscopy (IPES) shows that the deposited gold attenuates the Ti 3d states, which dominate the conduction band. In the case of lithium, XPS analysis indicates that deposited atoms penetrate into the bulk, with a gradual buildup in the near-surface region. UPS shows the formation of a Ti 3+ 3d gap state 1.4 eV below the Fermi level. Band bending is not observed for low Li coverage due to pinning of the Fermi level to the gap state. Deposition of more than 10 ML is required for the work function to reach that of bulk Li. Unoccupied 3d states disappear from the IPES spectrum as they are filled by electrons injected from Li.

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“…Photoelectron spectroscopy allows for the study of surface elements, providing information about their chemical and electronic states. In particular, XPS, studies the emission of photoelectrons using soft-rays (200-2000) eV, while UPS [44] uses UV radiation (10-45) eV. In general, XPS can identify the characteristic binding energy, i.e.…”

Section: X-ray Photoelectron Spectroscopy (Xps) and Ultraviolet Photomentioning

confidence: 99%

Determination of Au Film Thiolation and Silane Bonding Onto SiO2 Films Within the Frame of Biosensor Surface Functionalization – an Analysis of Best Practices and Techniques

Bousiakou

Karapetis

2020

Croat. Chem. Acta

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This paper reviews some of the most common surface modification approaches in biosensing based on self-assembled monolayers with a particular focus on Au film thiolation and SiO2 film silanization. Such approaches are routinely used to alter the materials' surface properties towards a desired bioresponse. Furthermore, the most appropriate characterization methods towards ensuring successful surface modification are presented including XPS, HREELS, SPFS, Raman and FTIR spectroscopy as well as UPS with specific examples to demonstrate their importance. In addition, the mechanisms of fluorescent and non-fluorescent biotinylation of thiolated Au films and silanized SiO2 are discussed considering its importance in conjugating biomolecules such as enzymes, antibodies or chemokines onto surfaces, which carries high significance for biosensing applications. Finally, within this frame characterization routes towards ensuring effective attachment are discussed.

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Ultraviolet Photoelectron Spectroscopy

Cited by 4 publications

References 29 publications

Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Metallization of TiO₂(110) with Gold and Lithium

Determination of Au Film Thiolation and Silane Bonding Onto SiO2 Films Within the Frame of Biosensor Surface Functionalization – an Analysis of Best Practices and Techniques

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Ultraviolet Photoelectron Spectroscopy

Cited by 4 publications

References 29 publications

Stable copper‐based 2D perovskite (NH3C3H6NH3)CuBr4 thin film processed from green solvent for thermoelectric application

Stable copper‐based 2D perovskite (NH3C3H6NH3)CuBr4 thin film processed from green solvent for thermoelectric application

Metallization of TiO2(110) with Gold and Lithium

Determination of Au Film Thiolation and Silane Bonding Onto SiO2 Films Within the Frame of Biosensor Surface Functionalization – an Analysis of Best Practices and Techniques

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Product

Resources

About

Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Metallization of TiO₂(110) with Gold and Lithium