Figure 14.3 shows the tipping furnace system used
by Nelson [14.2]. The boat, normally graphite or silica,
sits in the work tube in the center of the tilted furnace
such that the substrate, held with a clamp, is held at one
end of the boat with the growth solution at the other end.
Once the melt has been equilibrated the temperature is slowly reduced and the furnace is tipped to roll the solution
over the substrate. After a suitable time the furnace
is tipped back to the start position and the solution rolls
off the grown layer. This is a relatively simple and cheap
technique but has the limitations that solution removal is
difficult and it is normally only suitable for single-layer
growth.