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 Weather in January 2018. Vienna in January. Vienna weather in January is extremely cold with temperatures of (-2Â°) and 4Â° degrees, as result gloves and warm clothes are recommended. Since there are on average 16 rainy days in Vienna in January and chances for rain are high, it is recommended to take an umbrella with you.