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.
Summer. Summer is when Vienna is at its warmest, with temperatures reach an average high of 25 degrees Celsius and a surprisingly high chance of rain when compared to the spring and autumn months, though the rain does nothing to cool the high temperature.he temperatures can fall to as low as -3 degrees Celsius and there are only two hours of sunlight on average each day. The cold in Vienna is also compounded by snow fall, strong winds and some patches of rain.