Pentavalent impurities Impurity atoms with 5 valence electrons produce n-type semiconductors by contributing extra electrons. Trivalent impurities Impurity atoms with 3 valence electrons produce p-type semiconductors by producing a  hole  or electron deficiency.he Doping of Semiconductors. The addition of a small percentage of foreign atoms in the regular crystal lattice of silicon or germanium produces dramatic changes in their electrical properties, producing n-type and p-type semiconductors.
Vienna: Annual Weather Averages. July is the hottest month in Vienna with an average temperature of 19Â°C (66Â°F) and the coldest is January at -1Â°C (30Â°F) with the most daily sunshine hours at 9 in July. The wettest month is June with an average of 74mm of rain. Loading weather data.
The warmest day over the next 14 days in Vienna is forecast to be 24th October at 19Â°C (66Â°F) and the warmest night on 15th October at 11Â°C (52Â°F). The average temperature over the next 14 days is forecast to be 14Â°C (57Â°F) and there will be 4 days of sunshine. The average for October is 10Â°C (50Â°F) in Vienna.