Space charge limited currents in $\beta$-ZnP$_2$ layers with hole conductivity

We have studied space charge limited currents (SCLC) in thin $\beta$-ZnP$_2$ layers under visible light illumination. When the cathode is illuminated, the electric field strength drops down to zero values. However without illumination the electric fields strength at crystal boundary is sufficient to form microplasmas and to destruct the crystal. Our simulations agree with experiments when in addition to the standard theory of SLCS we also add recombination processes with deep donor level.