Photoconductivity derived from an exact modelling of the uncompensated one-donor model. I - Simplified models revisited; and description of the method of solving the exact model equations

Photoconductivity associated with a simple photoconductor model, containing one localised (donor) level, is taken up carefully through different appro aches. Two Simplified approaches are analysed, that are based on the assump tion that some transitions between this level and the allowed bands can be neglected. The respective roles played by these hypotheses are specified th rough a hierarchical classification, and the limits of validity of the comb ined approximations are carefully stated. In a parallel direction, the rela ted complete model is presented, which excludes no transitions and is based on Fermi-Dirac statistics. The resolution procedure of the resulting non-l inear system of equations is then described, with the purpose of comparing the respective behaviours of all those models.