Fermi, generally correlation

Density functional theory-based methods ultimately derive from quantum mechanics research from the 1920 s, especially the Thomas-Fermi-Dirac model, and from Slater s fundamental work in quantum chemistry in the 1950 s. The DFT approach is based upon a strategy of modeling electron correlation via general functionals of the electron density. 

Figure 9, Schematic showing energy correlations under conditions of illumination for the cell of Figure 8. Both electrodes are assumed to be illuminated and the general case of unequal band gaps is shown. The stored energy for oxidation is equal to EF(Oi/H20) — nE fn, surface) while that for reduction is EF(Hgo/H2> — pEf (p, surface), Ef denotes the Fermi level as it was at equilibrium in the dark in Figure 8, while Ef and Ef are the Fermi levels in the two metals when the semiconductors are both illuminated. Other symbols as in Figures 7 and 8 (13).

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