Abstract
A p - n junction was made by alloying indium on an n -type germanium pellet and it was put into an electrolyte solution of copper salt. When suitable reverse voltage was applied on the junction by a charged condenser, copper shaded pattern was deposited on the opposite side of the alloyed surface in accordance with the density of the reverse current flowing through every part of the p - n junction. By this method, the breakdown at the imperfections of p - n junction due to the defects in the germanium crystal, those at the periphery of p -type recrystallized layer, and those inside p - n junction grown in alloying process were observed. Then, the cross section was made referring to the pattern, and several kinds of the imperfections of p - n junction were observed under microscope.
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