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.
The average temperature in Vienna in April is quite mild at 10.5 Â°C (50.9 Â°F). Afternoons can be mild with average high temperatures reaching 15 Â°C (59 Â°F). Overnight temperatures are generally cool with an average low of 6 Â°C (42.8 Â°F). In April the mean diurnal temperature variation/ range is 9 Â°C (16.2 Â°F). The weather in April is slightly dry with occasional rain. Only 51mm (2in) of H2O accrues during on average 13 days. In April the blue above Vienna is fair having on average a moderate 5:56 of bright solar radiation per day. The shortest day is 12:47 long and the longest day is 14:26 long with an average length of 13:38.