Band edge potential

The flat band potential Ea, (the Fermi level cp at the flat band) depends on the impurity concentration but the band edge potentials Ec and E (the band edge levels and ev) are characteristic of individual semiconductor electrodes, irrespective of the type of impurity (n-type or p-type). The relationship between the flat band potential and the band edge potentials is given in Eqn. 5- 1  

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Table 5-6 shows for semiconductor metal oxides the flat band potential in aqueous solutions at various pH values and the conduction band edge potential E c at the iso-electric point pH,. ... 

Figure 5-64 shows the band edge potential for compound semiconductor electrodes in aqueous solutions, in which the standard redox potentials (the Fermi levels) of some hydrated redox particles are also shown on the right hand side. In studying reaction kinetics of redox electron transfer at semiconductor electrodes, it is important to find the relationship between the band edge level (the band edge potential) and the Fermi level of redox electrons (the redox potential) as is described in Chap. 8. 

Beach and co-workers [115] measured the band edge potentials of both p-and n-GaN, relative to SGE, finding the p-GaN band-edge potential appropriate for water splitting. If the reduction potential of water is located below the conduction band edge of p-GaN, photogenerated electrons can be spontaneously injected into the electrolyte solution and H (aq) reduced to H2. Kobayashi and... 

Although the properties required by photocatalysts for water splitting have been identified (band edge potentials suitable for water splitting, band-gap energy around 2.0-2.2 eV, and stability under reaction conditions), it is... 

FIGURE 22.5 Electrode potential consisting of interfacial potential A(f>H and space charge potential Ac()sc for an intrinsic semiconductor = flat band potential, v = valence band edge potential, and... 

Fig. 4.6 (a) Absoiption spectra of ATaOa, (A = Li, Na, and K). (b) Excitation and emission spectra of ATaOs (Reprinted with permission from Ref. [27] Copyright 2001, American Chemical Society), (c) XRD patterns of La-doped NaTaOs (Reprinted with permission from Ref. [4] Copyright 2003, American Chemical Society), (d) Calculated band-edge potentials of doped and co-doped NaTaOs (Reprinted with permission from Ref. [28] Copyright 2014, The Royal Society of Chemistry. Published by the PCCP Owner Societies)... 

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