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.
Average Weather in July in Vienna Austria. In Vienna, the month of July is characterized by gradually rising daily high temperatures, with daily highs increasing by 3Â°F, from 76Â°F to 79Â°F over the course of the month, and rarely exceeding 89Â°F or dropping below 65Â°F.