Abstract
The optoelectronic switching in two natural diamond samples of type 2-A is studied at voltages up to 1000 V and the energy density of control 60-ns, 308-nm laser pulses up to 0.6 J cm-2. It is shown that the design of a diamond switch affects the switching efficiency. When the energy density exceeds 0.2 J cm-2 and the interelectrode surface is completely illuminated, the surface breakdown is initiated by UV radiation, which shunts the current flow through the diamond crystal. When the illumination of the interelectrode surface is excluded, the surface breakdown does not occur. The threshold radiation densities sufficient for initiating the surface breakdown are determined for electric field strengths up to 10 kV cm-1.
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