Abstract
Germanium crystals were zone-levelled in an oxygen atmosphere. The oxygen concentration in the crystal, as deduced from infrared absorption at 856 cm −1, is proportional to the oxygen pressure p o 2 for p o 2 < 20 mm Hg; at higher oxygen pressures, the oxygen concentration is constant at 7 × 10 17 atoms/cm 3. On heat treatment at a relatively low temperature (400°C), donors are introduced in the crystal; the donors disappear again if the crystal is heated to a higher temperature (700°C). The number of donors depends strongly on the oxygen concentration. A tentative description of the results is given in terms of the equilibrium between isolated oxygen atoms and donor complexes consisting of four oxygen atoms. The Hall effect of the oxygen donors indicates the presence of several donor levels. In germanium crystals levelled under oxygen, two additional absorption bands were found at 1100 and 1260 cm −1.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
