Connection between charge transfer and alloying core-level shifts based on density-functional calculations

2000 ◽  
Vol 61 (8) ◽  
pp. 5229-5236 ◽  
Author(s):  
M. Methfessel ◽  
Vincenzo Fiorentini ◽  
Sabrina Oppo
Keyword(s):  
Charge Transfer ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Core Level ◽  
Level Shifts

Core Level Shifts and Grain Boundary Cohesion

1998 ◽  
Vol 4 (S2) ◽  
pp. 766-767
Author(s):  
D. A. Muller
Keyword(s):  
Charge Transfer ◽  
Valence Band ◽  
Core Level ◽  
Level Shift ◽  
The Core ◽  
Metallic Interfaces ◽  
Level Shifts ◽  
Electron Energy Loss ◽  
Valence Band Width

The role of core level shifts at metallic interfaces has often been ignored in electron energy loss spectroscopy (EELS) even though very small changes in bond length can lead to large core level shifts. However, the popular interpretation of core level shifts as measures of charge transfer is highly problematic. For instance, in binary alloys systems, the core level shifts can be the same sign for both atomic constituents[l]. The simple interpretation would require that both atomic species had lost or gained charge. Further, the signs of the core level shifts can be opposite to those expected from electronegativity arguments[2]. A core level shift (CLS) is still possible, even when no charge transfer occurs. As illustrated in Fig. 1, if the valence band width is increased, the position of the center of the valence band with respect to the Fermi energy will change (as the number of electrons remains unchanged).

Core-level shifts from density-functional computations

1993 ◽  
Vol 47 (19) ◽  
pp. 12992-12994 ◽  
Author(s):  
Luca Pedocchi ◽  
Nino Russo ◽  
Dennis R. Salahub
Keyword(s):  
Density Functional ◽  
Core Level ◽  
Level Shifts ◽  
Density Functional Computations

Theoretical studies of heteroatom-doping in TiO2 to enhance the electron injection in dye-sensitized solar cells

RSC Advances ◽  
2015 ◽  
Vol 5 (97) ◽  
pp. 79868-79873 ◽  
Author(s):  
Li Hao ◽  
Fu-Quan Bai ◽  
Chui-Peng Kong ◽  
Shamsa Bibi ◽  
Hong-Xing Zhang
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Dye Sensitized Solar Cells ◽  
Theoretical Studies ◽  
Heteroatom Doping ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Transfer Properties

Density functional calculations have been explored to analyze the structural, electronic and charge transfer properties of a doped TiO2 substrate and catechol–TiO2 interfaces for dye-sensitized solar cells.

ENHANCED SCREENING OF CORE HOLES AT TRANSITION-METAL SURFACES

1995 ◽  
Vol 02 (02) ◽  
pp. 197-201 ◽  
Author(s):  
M. METHFESSEL ◽  
D. HENNIG ◽  
M. SCHEFFLER
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Density Functional ◽  
Core Level ◽  
Level Shift ◽  
Core Hole ◽  
Initial State ◽  
Functional Theory ◽  
Level Shifts

Ab initio calculations based on density-functional theory were used to obtain surface core-level shifts for the 4d transition metals and silver in the initial-state model and in the full-impurity formulation, giving an unambiguous separation into initial state and screening terms. This shows that the screening of the core hole is substantially better at the surface than in the bulk for a transition metal. For Ag, an opposite and even larger effect is found, showing the central role of d-electron screening in the surface core-level shift of the transition metals.

Overlayer Core-level Shifts Induced by Limited Charge Transfer

1992 ◽  
Vol T41 ◽  
pp. 194-196 ◽  
Author(s):  
S Raaen ◽  
C Berg ◽  
N A Braaten
Keyword(s):  
Charge Transfer ◽  
Core Level ◽  
Level Shifts
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