The optical absorption of 60° dislocations in germanium

Abstract

Measurements of optical absorption suggest a two level model for the dislocation states. One of them is 0.1 eV below the conduction band edge, the other one 0.1 eV above the valence band edge. A dangling bond level does not appear directly in optical measurements. The reason is probably the poor overlapping of the dangling bond state with band states. The maximum electrostatic charging in the environment of the dislocation line is found to be much smaller than it is commonly assumed.