Observation of persistent photoconductivity in GaxIn1-xP/InP:Fe (0<or=x<0.18)
Persistent photoconductivity (PPC) has been observed in GaxIn1-xP/InP:Fe (0<or=x<0.18) in a large temperature range from room temperature down to 77 K. The relationships between PPC and sample structure, material parameters, temperature and excitation time have been experimentally investigated. The results have been explained by the assumption that a macroscopic potential barrier between the film and the substrate separates the charge and thus delays recombination.