The Drug Drama

A two-stage technique for single crystal growth of HgCdTe using a pressurized Bridgman method

“…There would be exhaustion of CdTe solute if no complement of CdTe solute was added to the liquid near the growth interface. In such a situation the composition of HgCdTe solid would be less than 0.21 along the longitudinal direction as the solidification proceeded, as in the slush method [9].…”

“…2(B)). Although the growth temperature is very low, the utilization rate of the crystal was also very low, because the x composition of the majority of the ingot was not 0.21 [9,10].…”

“…The use of low growth temperatures, down to 710 C, has been used to grow Hg 1Àx Cd x Te crystals by the so-called Slush method which uses a starting charge of z ¼ 0:06 [9]. But, the Slush method normally only yields one or two wafers with a composition x ¼ 0:21 (as shown in Fig.…”

Growth and properties of 40mm diameter Hg1−xCdxTe using the two- stage Pressurised Bridgman Method

“…Because of the metallurgical characteristics of HgCdTe, such as the large gap between the solidus and liquidus in the CdTe-HgTe phase diagram, as well as the high mercury pressures that are developed by HgCdTe melts, it is very difficult to grow large, high quality HgCdTe crystals. A wide variety of techniques for growth from the liquid have been used to produce bulk crystals of Hg 1Àx Cd x Te, including the conventional Bridgman method [4,5] and ACRT-Bridgman [6], Solid State Recrystallization [7][8][9], the Travelling Heater Method [10][11][12] and the Slush method [13]. One of the fundamental aims of these studies is to decrease the growth temperature so as to reduce the high temperature growth defects that are endemic with high temperature growth.…”