2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26767In relevance to the photoelectrification mechanisms proposed in Part I, we derive rate equations for the negative-u and STE photoelectrification modes and solve them under conditions close to experimental ones. Exact solutions are obtained for the case of a slow electron-hole recombination at negative-U sites. These solutions are compared with photovoltage versus time transients by "short circuit currents" in photocharging experiments.21 pages, 1 figure, 6 subfigures, 1 tableMaterials Sciencetext