A seed planter has at least one rock shaft carrying a rank of planter assemblies. The device includes a transfer cylinder rotating about an axis and having an outer surface. The crystalline layer and the noncrystalline layer are doped with dopants having a same dopant conductivity as the substrate. Cold air is added to the second body through a second duct to cool the gas, and crystals formed by liquefaction settle and are removed through a lower duct while gases at a temperature of 600\xb0 C.