Lithium Driftability in Detector-Grade Germanium

The behavior of many germanium crystals during lithium-ion drift, in terms of compensated depth W as a function of drift time t, does not follow the prediction of the equation: W = (2¿LiVt)1/2 Modification of the lithiim velocity expression to include the loss of mobile lithium ions during drift yields the expression: W = [¿LiV¿(1-e-2t/¿)]1/2 which seems to describe satisfactorily the experimental results. In addition to the loss mechanism, the effect of oxygen on lithium-ion drift mobility is considered.