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This lecture delves into the phenomena occurring in semiconductors under high electric fields, exploring the breakdown of Ohm's law, the concept of electronic temperature, and saturation velocity. It further discusses out-of-equilibrium properties, band-to-band and single-level recombinations, and the Shockley-Read-Hall theory. The lecture also covers the Auger process, emission and capture rates in single-level recombinations, and the impact of injection on recombination rates.