The Traveling Heater Method (THM) was used extensively in the early 1970’s at Tyco Laboratories in the growth of a number of semiconductor materials such as CdTe. This technology was transferred from Tyco Laboratories to RMD and growth of CdTe and CdZnTe continues to this day. The THM technology for CdTe and CdZnTe is based on the use of a solvent such as molten Te for the dissolution, transport and growth of the crystal. This vertical growth process is done in a sealed quartz ampoule. The process occurs by moving either the ampoule or the heater to get the molten zone to traverse the growth charge. Impurities collect in the molten Te and the resultant crystal is purified. The following picture shows a crystal being grown by this technique. A sealed quartz ampoule is being slowly lowered through the heater.
A crystal being grown with the Traveling Heater method.