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We demonstrate that the transport of hot carriers may result in the phenomenon where an oscillated output current appears at the waveforms in a high-power photoconductive semiconductor switch (PCSS) working at long pulse width when the laser disappears or the electric field changes.The variational laser and electric field will affect the scattering rates of hot carriers and crystal lattice in high-power PCSS,and the drift velocity of hot carriers and also the on-state resistance will be changed.The present result is important for reducing the on-state resistance and improving the output characteristics of high-power Si/GaAs PCSS.