Grown junctions are formed during the
Czochralski crystal pulling process.
Single crystals around 2 m long and with
diameters up to 300 mm can be grown using this
method based on the pulling of a single crystal
from a molten semiconductor. If impurities of p
and n-type are alternately added to the molten
semiconductor material during the pulling
process, a pn junction appears.
Methods of making junctions
After slicing the large-area device can be cut into a large number (thousands)
of smaller-area semiconductor diodes. Usually wafers are made in this way.
In practice the Czochralski method is used to obtain high quality doped
semiconductor crystals (... Substrates for ICs).