The longitudinal composition distribution of HgCdTe film grown by LPE

Electron energy spectrum of scanning electron microscope (SEM), infrared transmission spectroscopy measurement and Auger energy spectroscopy measurement were used to analyze the longitudinal composition distribution of HgCdTe film grown by liquid phase epitaxy (LPE). Two different distribution profiles were determined for the three metrical ways, theoretical explanations for the diverse results were proposed to explore which measurement is better for longitudinal composition analyses. In addition to this, comparison of measured results of as-grown LPE HgCdTe film with the published experimental result was also confirmed to show the correct composition distribution along growing direction, further influences of longitudinal composition distribution on the performance of HgCdTe focal plane array (FPA) detectors were discussed.