TIME-RESOLVED PHOTOLUMINESCENCE OF UNDOPED INP

Energy and time-resolved photoluminescence data have been obtained for nominally undoped (n 4.5 X 10(15) cm-3) bulk InP grown by the vertica l-gradient freeze method. The data were taken as a function of tempera ture, from 80 to 290 K, and analyzed using a solution to the continuit y equation. The resulting lifetime values range from 300 ns to 3.2 mus , and surface recombination velocities were fund to be on the order of 10(3) cm/s. The temperature dependence can be explained by assuming a radiatively limited recombination with a resulting B coefficient grea ter-than-or-equal-to 5.9 X 10(-11) cm3/s at 300 K.