UV-induced double injection in α-sulfur single crystals

The I–V characteristics of the UV-induced double injection of carriers into sulfur single crystals are reported. These characteristics display a quadratic behavior as a function of the electric field up to E≈7×10³$\text{Volts}\text{cm}$ where it changes to a cubic law dependence. The V² branch can be accounted for by means of the one carrier space charge limited current. The cube law dependence arises as a result of the recombination limited two-carrier injection according to the model of Lampert and Mark. We estimate values for the common lifetime τ = 4.8×10^?3 sec, and the trap modulated mobility of holes $\text{μ}{}_{\mathrm{<mtext>h</mtext>}}\text{θ}{}_{\mathrm{<mtext>h</mtext>}}\text{=8.9×10}{}^{\mathrm{?6}}\text{cm}{}^2\text{V sec}$.