Neutron-irradiated InP:Fe semi-insulating crystals have been investigated b
y photoluminescence (PL) and Hall effect. The evolution of the different PL
transitions was studied as a function of the thermal neutron dose, anneali
ng temperature and excitation power. Hall effect measurements confirm the s
uccess of the doping technique in semi-insulating InP:Fe. For tin concentra
tion higher than 6x10(15) cm(-3) the InP:Fe samples annealed at 550 degrees
C are clearly n-type with a free carrier concentration slightly lower than
the calculated tin concentration. (C) 1999 Elsevier Science B.V. All right
s reserved.