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.
Usually, temperatures are often pleasantly warm during the day and cool at night: in Vienna the average daily temperature in July is around 21 Â°C (70 Â°F), and the maximum temperature is around 25/26 Â°C (77/79 Â°F) in Vienna and other major cities, but sometimes there may be hot and muggy days, especially in the plain (i.e. in the area of Vienna), with lows above 20 Â°C (68 Â°F) and highs above 30 Â°C (86 Â°F).