Annealing properties of ion-implanted p-n junctions in silicon

Abstract

Phosphorus-, arsenic-, and boron-implanted junctions have been investigated with special emphasis on their annealing behavior of the junction-leakage currents. It is shown that a minimum of about 900°C and 30 min annealing is required for junction qualities equal to that of diffused ones. Hall-effect measurements of the implanted region show that about 900°C for phosphorus annealing and 1000°C for arsenic and boron annealing are required to restore carrier concentrations corresponding to the implanted impurities, respectively. The relative importance of surface area and perimeter contribution to the junction leakage is identified. It is shown that for an area-to-perimeter ratio smaller than about 1 mil, the perimeter contribution dominates. There are indications that the distribution of the leakage contributing g-r centers coincide with the implanted impurities. © 1974 American Institute of Physics.