碲锌镉晶体中夹杂问题的实验研究

Experimental study of inclusions in cadmium zinc telluride crystals

采用红外透射显微镜检测和研究了热解氮化硼(PBN)坩埚生长碲锌镉晶体(CdZnTe)中的缺陷—夹杂,并对夹杂的影响因素进行了分析。研究发现:不同原料的化学配比、自由空间体积、饱和蒸汽压、晶体生长温场对晶体中夹杂的种类、形状、密度和尺寸都存在着影响,通过一系列工艺的改进可以获得夹杂合格的碲锌镉晶体。

To observe the inclusions distribution and its causes of cadmium zinc telluride crystals(CdZnTe),which grown by vertical Bridgman method using pyrolytic boron nitride(PBN)crucible,were investigated using the infrared transmission microscope.It found that,some factors such as composition of raw material,free space volume,saturated vapor pressure and temperature field of crystal growth all affected type,appearance,density,size of inclusions,and through a series of processing improvements,good CdZnTe crystals with nearly no inclusions can be obtained.