Abstract
The Hall mobility of electrons in germanium single crystals heavily doped with neutral tin impurities has been measured between 35 and 300 K. The mobility of electrons decreases with increasing tin concentration (NSn); in the range of NSn between 1.5×1019/cm3 and 8×1019/cm3 the mobility is proportional to 1/NSn, and above 1.5×1020/cm3 the mobility decreases rapidly. The mobility for samples with lower concentration is conjectured to originate from the presence of a nonperiodic potential (tin potential) in the periodic one and the mobility for samples with higher concentration from the presence of tin precipitate and space-charge region. In the range of NSn between 1×1020/cm3 and 4×1020/cm3, tin precipitates are detected by means of light scattering and X-ray microanalysis. The sizes of these scattering centers determined from the angular distribution of scattered light intensity are in good agreement with those estimated from X-ray microanalysis.
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