Electrochemical characterization of polycrystalline ZnO layers

A Study of the Photoanodic Dissolution of CdS with Electrical and Opto‐electrical Impedance Spectroscopy

“…The anodic decomposition of CdS requires only two charge carriers2 Hence the simplest model involves a reaction scheme consisting of two electrochemical steps kl (Cd:S)~o~ + h + -->Xl [1] k2 X1 + h § ---) (Cd:S)s~aco + C_d 2+ + S [2] in which X1 is a decomposition intermediate and (Cd:S)su~,ce is an unbroken CdS surface bond. The decomposition intermediate X1 can be seen as a surface bond from which one electron has been removed.…”

Luminescence studies of semiconductor electrodes

“…3). The result with ZnO may be attributed to the absence of hydrogen evolution; ZnO shows a very large hydrogen overpotential [23]. The PL stability in the GaN case may be due to the unusual chemical stability of the nitride.…”

Generation and Quenching of Luminescence in n-Type Porous Silicon/Solution Diodes: Role of Adsorbed Hydrogen

“…Obviously hydrogen cannot be evolved in the aprotic solvent. For ZnO the overpotential for hydrogen generation is very large; reduction of water becomes appreciable only at a potential more than 1 V negative with respect to the flat band value …”

“…For ZnO the overpotential for hydrogen generation is very large; reduction of water becomes appreciable only at a potential more than 1 V negative with respect to the flat band value. 34 There is also considerable evidence to support the important role of hydrogen in electron-hole recombination in illuminated p-type electrodes in aqueous solutions. Peter and co-workers 35 demonstrated with photoelectrochemical measurements that absorption of hydrogen in p-type GaP gives rise to near-surface states which promote effective electron-hole recombination.…”