Resistivity and photoconductivity of p-type Zn3P2 polycrystals grown by closed tube vapour transport method have been investigated. Persistent photoconductivity (PPC) has been observed at temperatures T < 200 K. At 77 K, the photoconduction persists for over 103 s after termination of the light. The PPC buildup and decay kinetics have been measured at 77 K and analyzed in the frame of large lattice-relaxed deep levels. We have determined the spectral dependence for the optical cross section and obtain an optical ionization energy of 0.83 eV.
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