Abstract
Abstract Crystalline germanium films were grown by vacuum evaporation on heated corning glass substrates. Intrinsic germanium (99-999% and of 30 Ω-cm resistivity) was evaporated from a resistance-heated tungsten conical basket pasted with a paste of sodium silicate and alumina on to cleaned microscope glass slides with the help of a conventional vacuum system at pressure between 10−5 and 10−4 torr. The electrical conductivity of the films was measured in vacuum at temperatures varying between 77°K and 400°K. The island radius of the film is calculated using the Frenkel model and the grain size was found to increase with thickness.
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