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.
Vienna, Austria weather text for Wed 19th April. The Vienna, Austria weather is going to be blizzard. Vienna, Austria visibility is going to be around 13 km i.e. 7 miles and an atmospheric pressure of 1019 mb. The daytime temperature is going to reach 6 Â°c and the temperature is going to dip to 0 Â°c at night.