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Actual transient photocurrents from a one-donor (1D) photoconductor

Transient responses to be expected from a single-level model, after a light is switched on and then off, are analysed through computer simulations of the complete differential equations of the model. A strong dissymmetry arises between growth and decay transients for free electrons and free holes. Transients for trapped electrons display decreasing or increasing modes. Time constants for growth for free and trapped electrons and free holes vary over many decades of time as functions of both temperature, T, and light intensity, G. A renewed insight is cast into the actual internal processes of charge exchanges between free and localized levels, and a direct quantitative study is made of photoconductivity gain. Gain is shown to display either extremely large values at temperatures far below a so-called temperature T 0, or a strong loss of sensitivity for temperatures ranging in an extended vicinity of T 0, including T > T 0.